Variable power optical system and imaging apparatus

Abstract

The variable magnification optical system comprises, in order from an object side to an image side, a first lens group having a positive refractive power, an intermediate group comprising two or less lens groups having a negative refractive power, and a subsequent group comprising a plurality of lens groups. The lens group closest to the object side of the subsequent groups has positive refractive power. When changing magnification, the first lens group moves, and all intervals between adjacent lens groups change. The variable magnification optical system satisfies a preset conditional expression.

Description

Magnification optical system and camera device Technical Field

[0001] The present invention relates to a zoom optical system and a camera device. Background Technology

[0002] Previously, as a zoom optical system that can be used in video recording devices such as digital cameras, the zoom optical system described in Japanese Patent Application Publication No. 2023-040257 is known. Summary of the Invention

[0003] There is a demand for a zoom optical system that is compact in structure and maintains good optical performance throughout the zoom range. These requirements are increasing year by year.

[0004] The present invention provides a zoom optical system with a small structure and good optical performance throughout the zoom range, and a camera device having the zoom optical system.

[0005] -Means used to solve technical problems-

[0006] The first aspect of the present invention is a zoom optical system, which, from the object side to the image side, consists of a first lens group with positive refractive power, an intermediate group composed of two or fewer lens groups with negative refractive power, and a subsequent group composed of multiple lens groups. The lens group closest to the object side in the subsequent group has positive refractive power. During zooming, the first lens group moves, and the spacing between all adjacent lens groups changes.

[0007] The above-mentioned zoom optical system satisfies the conditions (1), (2) and (3) expressed by the following equations:

[0008] 2.9<TLw / (ft×tanωt)<7 (1)

[0009] 0.4<Bfw / (ft×tanωt)<1.5 (2)

[0010] 0.05 < (fw × TLw) / (ft) 2 ×FNow)<0.23 (3)。

[0011] The notation for conditions (1), (2), and (3) is defined as follows: TLw is the sum of the distance along the optical axis from the object-side lens surface of the first lens group to the image-side lens surface of the subsequent lens groups, when the object is focused at infinity at the wide-angle end. ft is the focal length of the entire system when the object is focused at infinity at the telephoto end. ωt is the maximum half-angle view when the object is focused at infinity at the telephoto end. Bfw is the focal length of the entire system when the object is focused at infinity at the wide-angle end. fw is the focal length of the entire system when the object is focused at infinity at the wide-angle end. FNow is the open F-number when the object is focused at infinity at the wide-angle end.

[0012] The second aspect of the present invention is in the zoom optical system of the first aspect.

[0013] The above-mentioned zoom optical system satisfies the condition (3-1) expressed by the following equation:

[0014] 0.08 < (fw × TLw) / (ft) 2 ×FNow) < 0.165 (3-1).

[0015] The third aspect of the present invention is in the zoom optical system of the second aspect.

[0016] The above-mentioned zoom optical system satisfies the condition (3-2) expressed by the following equation:

[0017] 0.1 < (fw × TLw) / (ft) 2 ×FNow)<0.16 (3-2)。

[0018] In the fourth aspect of the present invention, in the zoom optical system of the first aspect, when the maximum half-angle view is set to ωw at the state of focusing on an object at infinity at the wide-angle end,

[0019] The above-mentioned zoom optical system satisfies condition (4) expressed by the following equation:

[0020] 0.15<tanωw / FNow<0.5 (4).

[0021] The fifth aspect of the present invention is in the zoom optical system of the first aspect.

[0022] The above-mentioned zoom optical system satisfies condition (5) expressed by the following equation:

[0023] 0.65<FNow / (ft / fw)<1.6 (5).

[0024] The sixth aspect of the present invention, in the zoom optical system of the first aspect, wherein the focal length of the first lens group is set to f1,

[0025] The above-mentioned zoom optical system satisfies the condition (6) expressed by the following equation:

[0026] 0.02 < fw / f1 < 0.3 (6).

[0027] In the seventh aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the first lens group is set to f1 and the focal length of the intermediate group is set to fMw in the state of focusing on an object at infinity at the wide-angle end,

[0028] The above-mentioned zoom optical system satisfies the condition (7) expressed by the following equation:

[0029] 4.5<f1 / (-fMw)<14 (7).

[0030] In the eighth aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the intermediate group is set to fMw while focusing on an object at infinity at the wide-angle end,

[0031] The above-mentioned zoom optical system satisfies the condition (8) expressed by the following equation:

[0032] 0.3 < (-fMw) / (fw × ft) 1 / 2 <1.4 (8).

[0033] In the ninth aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the first lens group is set to f1 and the open F-value is set to FNot when focusing on an object at infinity at the telephoto end,

[0034] The above-mentioned zoom optical system satisfies the condition (9) expressed by the following equation:

[0035] 5<f1 / (ft / FNot)<20 (9).

[0036] The tenth aspect of the present invention is in the zoom optical system of the first aspect.

[0037] The above-mentioned zoom optical system satisfies the condition (10) expressed by the following equation:

[0038] 2.5 < TLw / fw < 8 (10).

[0039] The eleventh aspect of the present invention is in the zoom optical system of the second aspect.

[0040] The above-mentioned zoom optical system satisfies the condition (1-1) expressed by the following equation:

[0041] 3.5<TLw / (ft×tanωt)<6 (1-1).

[0042] In the 12th aspect of the present invention, in the zoom optical system of the 11th aspect, when the maximum half-angle view is set to ωw at the state of focusing on an object at infinity at the wide-angle end,

[0043] The above-mentioned zoom optical system satisfies the condition (4-1) expressed by the following equation:

[0044] 0.21<tanωw / FNow<0.35 (4-1).

[0045] The 13th aspect of the present invention is the zoom optical system of the 12th aspect.

[0046] The above-mentioned zoom optical system satisfies the condition (5-1) expressed by the following equation:

[0047] 0.85<FNow / (ft / fw)<1.28 (5-1).

[0048] The 14th aspect of the present invention, in the zoom optical system of the 13th aspect, involves setting the focal length of the first lens group to f1.

[0049] The above-mentioned zoom optical system satisfies the condition (6-2) expressed by the following equation:

[0050] 0.05<fw / f1<0.13 (6-2).

[0051] In the zoom optical system of the 14th embodiment of the present invention, the 15th embodiment is achieved when the focal length of the intermediate group is set to fMw, with the wide-angle end focused on an object at infinity.

[0052] The above-mentioned zoom optical system satisfies the condition (7-1) expressed by the following equation:

[0053] 5.7<f1 / (-fMw)<8.7 (7-1).

[0054] In the 16th aspect of the present invention, in the zoom optical system of the 15th aspect, the first lens group includes a negative lens and a positive lens.

[0055] In the 17th aspect of the present invention, in the zoom optical system of the 15th aspect, the intermediate group includes three negative lenses.

[0056] In the 18th aspect of the present invention, in the zoom optical system of the 14th aspect, the intermediate group includes an Lmn lens with negative refractive power, the object-side surface of the Lmn lens being an aspherical surface, the refractive power of which at the position of maximum effective diameter is shifted in the positive direction compared to the refractive power in the paraxial region.

[0057] In the 19th aspect of the present invention, in the zoom optical system of the 18th aspect, the object-side surface of the Lmn lens is concave in the paraxial region and convex in the peripheral portion including the position of the maximum effective diameter.

[0058] The 20th aspect of the present invention is a zoom optical system in the 15th aspect.

[0059] The above-mentioned zoom optical system satisfies the condition (10-1) expressed by the following equation:

[0060] 3.5<TLw / fw<6 (10-1).

[0061] In the 21st aspect of the present invention, in the zoom optical system of the 15th aspect, when the focal length of the intermediate group is set to fMw at the state where the wide-angle end is focused on an object at infinity,

[0062] The above-mentioned zoom optical system satisfies the condition (8-1) expressed by the following equation:

[0063] 0.6 < (-fMw) / (fw × ft) 1 / 2 <0.9 (8-1).

[0064] In the 22nd aspect of the present invention, in the zoom optical system of the 15th aspect, when the open F-value is set to FNot while focusing on an object at infinity at the telephoto end,

[0065] The above-mentioned zoom optical system satisfies the condition (9-1) expressed by the following equation:

[0066] 7<f1 / (ft / FNot)<11 (9-1).

[0067] The 23rd aspect of the present invention is in the zoom optical system of the 3rd aspect.

[0068] The above-mentioned zoom optical system satisfies the condition (1-1) expressed by the following equation:

[0069] 3.5<TLw / (ft×tanωt)<6 (1-1).

[0070] In the 24th aspect of the present invention, in the zoom optical system of the 23rd aspect, when the maximum half-angle view is set to ωw at the wide-angle end with the object focused at infinity,

[0071] The above-mentioned zoom optical system satisfies the condition (4-1) expressed by the following equation:

[0072] 0.21<tanωw / FNow<0.35 (4-1).

[0073] The 25th aspect of the present invention is the zoom optical system of the 24th aspect.

[0074] The above-mentioned zoom optical system satisfies the condition (5-1) expressed by the following equation:

[0075] 0.85<FNow / (ft / fw)<1.28 (5-1).

[0076] The 26th aspect of the present invention, in the zoom optical system of the 25th aspect, involves setting the focal length of the first lens group to f1.

[0077] The above-mentioned zoom optical system satisfies the condition (6-1) expressed by the following equation:

[0078] 0.048<fw / f1<0.14 (6-1).

[0079] In the 27th aspect of the present invention, in the zoom optical system of the 26th aspect, when the focal length of the intermediate group is set to fMw at the state where the wide-angle end is focused on an object at infinity,

[0080] The above-mentioned zoom optical system satisfies the condition (7-1) expressed by the following equation:

[0081] 5.7<f1 / (-fMw)<8.7 (7-1).

[0082] In the 28th aspect of the present invention, in the zoom optical system of the 27th aspect, the first lens group includes a negative lens and a positive lens.

[0083] In the 29th aspect of the present invention, in the zoom optical system of the 27th aspect, the intermediate group includes three negative lenses.

[0084] In the 30th aspect of the present invention, in the zoom optical system of the 26th aspect, the intermediate group includes an Lmn lens with negative refractive power, the object-side surface of the Lmn lens being an aspherical surface, the refractive power of which at the position of maximum effective diameter is shifted in the positive direction compared to the refractive power in the paraxial region.

[0085] In the 31st aspect of the present invention, in the zoom optical system of the 30th aspect, the object-side surface of the Lmn lens is concave in the paraxial region and convex in the peripheral portion including the position of the maximum effective diameter.

[0086] The 32nd aspect of the present invention is the zoom optical system of the 27th aspect.

[0087] The above-mentioned zoom optical system satisfies the condition (10-1) expressed by the following equation:

[0088] 3.5<TLw / fw<6 (10-1).

[0089] In the zoom optical system of the 27th embodiment of the present invention, the 33rd embodiment is achieved when the focal length of the intermediate group is set to fMw, with the wide-angle end focused on an object at infinity.

[0090] The above-mentioned zoom optical system satisfies the condition (8-1) expressed by the following equation:

[0091] 0.6 < (-fMw) / (fw × ft) 1 / 2 <0.9 (8-1).

[0092] In the zoom optical system of the 27th embodiment of the present invention, the 34th embodiment is achieved when the open F-value is set to FNot when the telephoto end is focused on an object at infinity.

[0093] The above-mentioned zoom optical system satisfies the condition (9-1) expressed by the following equation:

[0094] 7<f1 / (ft / FNot)<11 (9-1).

[0095] In the zoom optical system of the first embodiment, the 35th aspect of the present invention is achieved by setting the open F-value to FNot when focusing on an object at infinity at the telephoto end, and setting the sum of the distance along the optical axis from the lens surface closest to the object side of the first lens group to the lens surface closest to the image side of the subsequent lens group, and the back focal length of the entire system in air-converted distance measurement, to TLt when focusing on an object at infinity at the telephoto end.

[0096] The above-mentioned zoom optical system satisfies the condition (11) expressed by the following equation:

[0097] 8<FNot×(TLt / ft)<17 (11).

[0098] In the zoom optical system of the first embodiment, the 36th aspect of the present invention, when the focal length of the first lens group is set to f1 and the focal length of the lens group closest to the object in the subsequent groups is set to fR1, further clarifies the present invention.

[0099] The above-mentioned zoom optical system satisfies the condition (12) expressed by the following equation:

[0100] 1.5 < f1 / fR1 < 17 (12).

[0101] The 37th aspect of the present invention is in the zoom optical system of the first aspect.

[0102] The above-mentioned zoom optical system satisfies the condition (13) expressed by the following equation:

[0103] 1.2<TLw / ft<2.2 (13).

[0104] The 38th aspect of the present invention is in the zoom optical system of the first aspect.

[0105] The above-mentioned zoom optical system satisfies the condition (14) expressed by the following equation:

[0106] 2.8 < ft / fw < 4 (14).

[0107] The 39th aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the first lens group is set to f1,

[0108] The above-mentioned zoom optical system satisfies the condition (15) expressed by the following equation:

[0109] 3 < f1 / (fw×ft) 1 / 2 <9 (15).

[0110] In the 40th aspect of the present invention, in the zoom optical system of the first aspect, when the object is focused at the telephoto end, the sum of the distance along the optical axis from the lens surface closest to the object side of the first lens group to the lens surface closest to the image side of the subsequent lens group and the back focal length of the entire system in terms of air-converted distance is set to TLt.

[0111] The above-mentioned zoom optical system satisfies the condition (16) expressed by the following equation:

[0112] 1.25<TLt / TLw<1.6 (16).

[0113] In the 41st aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the subsequent group is set to fRw while the object at infinity is focused at the wide-angle end,

[0114] The above-mentioned zoom optical system satisfies the condition (17) expressed by the following equation:

[0115] 0.3<fw / fRw<1.2 (17).

[0116] In the 42nd aspect of the present invention, in the zoom optical system of the first aspect, when the focal length of the subsequent group is set to fRt while the telephoto end is focused on an object at infinity,

[0117] The above-mentioned zoom optical system satisfies the condition (18) expressed by the following equation:

[0118] 0.6 < ft / fRt < 5 (18).

[0119] The 43rd aspect of the present invention, in the zoom optical system of the first aspect, involves setting the focal length of the lens group closest to the object in the subsequent group to fR1.

[0120] The above-mentioned zoom optical system satisfies the condition (19) expressed by the following equation:

[0121] 0.05 < fR1 / (fw×ft) 1 / 2 <3 (19).

[0122] The 44th aspect of the present invention, in the zoom optical system of the first aspect, involves setting the focal length of the lens group closest to the object in the subsequent group to fR1.

[0123] The above-mentioned zoom optical system satisfies the condition (20) expressed by the following equation:

[0124] 0.15 < fw / fR1 < 2 (20).

[0125] The 45th aspect of the present invention, in the zoom optical system of the first aspect, includes a vibration-damping group in a subsequent group that moves along a direction intersecting the optical axis when correcting image jitter. When the focal length of the vibration-damping group is set to fIS,

[0126] The above-mentioned zoom optical system satisfies the condition (21) expressed by the following equation:

[0127] 0.2<|fIS / ft|<2 (21).

[0128] In the 46th aspect of the present invention, in the zoom optical system of the first aspect, at least one focusing group is arranged in the subsequent group that moves along the optical axis during focusing, and when the focal length of the at least one focusing group is set to ff,

[0129] The above-mentioned zoom optical system satisfies the condition (22) expressed by the following equation:

[0130] 0.2<|ff / ft|<1.4 (22).

[0131] In the 47th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group includes an Lrn lens with negative refractive power, the image-side surface of the Lrn lens being aspherical, the refractive power of the aspherical surface at the position of maximum effective diameter being shifted in the positive direction compared with the refractive power in the paraxial region.

[0132] In the 48th aspect of the present invention, in the zoom optical system of the 47th aspect, the image-side surface of the Lrn lens is concave in the paraxial region and convex in the peripheral portion including the position of the maximum effective diameter.

[0133] In the 49th aspect of the present invention, in the zoom optical system of the first aspect, the focusing group that moves along the optical axis during focusing is only configured in the subsequent group.

[0134] In the 50th aspect of the present invention, in the zoom optical system of the 49th aspect, two focusing groups that move by changing their mutual spacing during focusing are arranged in a subsequent group.

[0135] In the 51st aspect of the present invention, in the zoom optical system of the first aspect, the first lens group includes a joint lens, which sequentially joins a negative meniscus lens with its convex surface facing the object side and a positive lens with its convex surface facing the object side, wherein the refractive index of the negative meniscus lens relative to the d-line is set to Ndn, and the Abbe number of the d-line reference of the negative meniscus lens is set to νdn.

[0136] The above-mentioned zoom optical system satisfies the condition (23) expressed by the following equation:

[0137] 1.94<Ndn+0.01×νdn<2.5 (23).

[0138] In the zoom optical system of the 51st embodiment of the present invention, the 52nd embodiment is achieved by setting the refractive index of the positive lens with its convex surface facing the object side relative to the d-line to Ndp, and setting the Abbe number of the d-line reference of the positive lens with its convex surface facing the object side to νdp.

[0139] The above-mentioned zoom optical system satisfies the condition (24) expressed by the following equation:

[0140] 2<Ndp+0.01×νdp<2.6 (24).

[0141] The 53rd aspect of the present invention, in the zoom optical system of the first aspect, involves setting the average Abbe number of the d-line reference of all positive lenses in the first lens group to νd1p_ave.

[0142] The above-mentioned zoom optical system satisfies the condition (25) expressed by the following equation:

[0143] 40<νd1p_ave<85 (25).

[0144] In the 54th aspect of the present invention, in the zoom optical system of the first aspect, the sum of the thicknesses along the optical axis of all lenses in the first lens group is set as d1sum, and the focal length of the first lens group is set as f1.

[0145] The above-mentioned zoom optical system satisfies the condition (26) expressed by the following equation:

[0146] 0.01<d1sum / f1<0.2 (26).

[0147] In the 55th aspect of the present invention, in the zoom optical system of the first aspect, the intermediate group consists of two lens groups with negative refractive power. When the focal length of the lens group closest to the object side of the intermediate group is set to fM1, and the focal length of the lens group closest to the image side of the intermediate group is set to fM2,...

[0148] The zoom optical system satisfies the condition (27) expressed by the following equation:

[0149] 0.01<fM1 / fM2<1.6 (27).

[0150] In the 56th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group is composed of a first subsequent lens group having positive refractive power, a second subsequent lens group having negative refractive power, and a third subsequent lens group, sequentially from the object side to the image side.

[0151] In the zoom optical system of the 56th embodiment of the present invention, the 57th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0152] The above-mentioned zoom optical system satisfies the condition (28) expressed by the following equation:

[0153] 0.2<fR1 / (-fR2)<2 (28).

[0154] In the 58th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group is composed of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, and a third subsequent lens group with negative refractive power, sequentially from the object side to the image side.

[0155] In the zoom optical system of the 58th embodiment of the present invention, the 59th embodiment further illustrates the following: when the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3.

[0156] The above-mentioned zoom optical system satisfies the condition (29) expressed by the following equation:

[0157] 0.4<fR2 / (-fR3)<3.7 (29).

[0158] In the zoom optical system of the 58th embodiment of the present invention, the 60th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0159] The above-mentioned zoom optical system satisfies the condition (30) expressed by the following equation:

[0160] 0.3 < fR1 / fR2 < 4 (30).

[0161] In the 61st aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group sequentially includes at least a first subsequent lens group having positive refractive power, a second subsequent lens group having negative refractive power, a third subsequent lens group having positive refractive power, and a fourth subsequent lens group having negative refractive power from the object side to the image side.

[0162] In the zoom optical system of the 61st embodiment of the present invention, the 62nd embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0163] The above-mentioned zoom optical system satisfies the condition (28A) expressed by the following equation:

[0164] 0.2<fR1 / (-fR2)<1.5 (28A).

[0165] In the zoom optical system of the 61st embodiment of the present invention, the 63rd embodiment further illustrates the following: when the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3.

[0166] The zoom optical system satisfies the condition (31) expressed by the following equation:

[0167] 0.3<(-fR2) / fR3<2.4 (31).

[0168] In the zoom optical system of the 61st embodiment of the present invention, the 64th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the third subsequent lens group is set to fR3.

[0169] The zoom optical system satisfies the condition (32) expressed by the following equation:

[0170] 0.1<fR1 / fR3<1.4 (32).

[0171] In the zoom optical system of the 61st embodiment of the present invention, the 65th embodiment is achieved when the focal length of the second subsequent lens group is set to fR2 and the focal length of the fourth subsequent lens group is set to fR4.

[0172] The zoom optical system satisfies the condition (33) expressed by the following equation:

[0173] 0.15<(-fR2) / (-fR4)<1.8 (33).

[0174] In the 66th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group sequentially includes at least a first subsequent lens group having positive refractive power, a second subsequent lens group having positive refractive power, a third subsequent lens group having negative refractive power, and a fourth subsequent lens group having positive refractive power from the object side to the image side.

[0175] In the zoom optical system of the 66th embodiment of the present invention, the 67th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the third subsequent lens group is set to fR3.

[0176] The above-mentioned zoom optical system satisfies the condition (34) expressed by the following equation:

[0177] 0.4<fR1 / (-fR3)<2.5 (34).

[0178] In the zoom optical system of the 66th embodiment of the present invention, the 68th embodiment is achieved when the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3.

[0179] The above-mentioned zoom optical system satisfies the condition (29A) expressed by the following equation:

[0180] 0.3<fR2 / (-fR3)<3.5 (29A).

[0181] In the zoom optical system of the 66th embodiment of the present invention, the 69th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0182] The above-mentioned zoom optical system satisfies the condition (30A) expressed by the following equation:

[0183] 0.3<fR1 / fR2<5 (30A).

[0184] In the 70th aspect of the present invention, in the zoom optical system of the 66th aspect, when the focal length of the second subsequent lens group is set to fR2 and the focal length of the fourth subsequent lens group is set to fR4,

[0185] The zoom optical system satisfies the condition (35) expressed by the following equation:

[0186] 0.1 < fR2 / fR4 < 2 (35).

[0187] In the 71st aspect of the present invention, in the zoom optical system of the first aspect, the subsequent groups are composed of a first subsequent lens group having positive refractive power, a second subsequent lens group having positive refractive power, a third subsequent lens group having positive refractive power, a fourth subsequent lens group, and a fifth subsequent lens group, in sequence from the object side to the image side.

[0188] In the zoom optical system of the 71st embodiment of the present invention, the 72nd embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0189] The above-mentioned zoom optical system satisfies the condition (30B) expressed by the following equation:

[0190] 0.1<fR1 / fR2<4.5 (30B).

[0191] In the zoom optical system of the 71st embodiment of the present invention, the 73rd embodiment further illustrates the following: when the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3.

[0192] The zoom optical system satisfies the condition (36) expressed by the following equation:

[0193] 0.2 < fR2 / fR3 < 3 (36).

[0194] In the 74th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group is composed of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, a fourth subsequent lens group with negative refractive power, and a fifth subsequent lens group with positive refractive power.

[0195] In the zoom optical system of the 74th embodiment of the present invention, the 75th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0196] The above-mentioned zoom optical system satisfies the condition (30C) expressed by the following equation:

[0197] 0.2<fR1 / fR2<4 (30C).

[0198] In the zoom optical system of the 74th embodiment of the present invention, the 76th embodiment further illustrates the following: when the focal length of the third subsequent lens group is set to fR3 and the focal length of the fourth subsequent lens group is set to fR4.

[0199] The above-mentioned zoom optical system satisfies the condition (37) expressed by the following equation:

[0200] 0.01<fR3 / fR4<4 (37).

[0201] In the 77th aspect of the present invention, in the zoom optical system of the first aspect, the subsequent group sequentially includes at least a first subsequent lens group having positive refractive power, a second subsequent lens group having negative refractive power, and a third subsequent lens group having negative refractive power from the object side to the image side.

[0202] In the zoom optical system of the 77th embodiment of the present invention, the 78th embodiment further illustrates the following: when the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2.

[0203] The above-mentioned zoom optical system satisfies the condition (28B) expressed by the following equation:

[0204] 0.2<fR1 / (-fR2)<1.8 (28B).

[0205] In the 77th aspect of the zoom optical system, the 79th aspect of the present invention, when the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3,

[0206] The above-mentioned zoom optical system satisfies the condition (38) expressed by the following equation:

[0207] 0.05<(-fR2) / (-fR3)<1.2 (38).

[0208] The 80th aspect of the present invention is a camera device having a zoom optical system of any one of the 1st to 79th aspects.

[0209] In addition, the phrases “composed of” and “consisting of” in this specification indicate that, in addition to the constituent elements listed, it may also include lenses that do not substantially have refractive power, as well as optical elements other than lenses such as apertures, filters and cover glass, and mechanism parts such as lens flanges, lens barrels, camera elements and hand shaking correction mechanisms.

[0210] In this manual, "a group with positive refractive power" and "a group with positive refractive power" mean that the group as a whole has positive refractive power. Similarly, "a group with negative refractive power" means that the group as a whole has negative refractive power. The meaning of "lens with positive refractive power" is the same as that of "positive lens". The meaning of "lens with negative refractive power" is the same as that of "negative lens". The term "group" in this manual is not limited to a structure composed of multiple lenses; it can also be a structure composed of only one lens.

[0211] A compound aspherical lens (a lens (e.g., a spherical lens) and a membrane with an aspherical shape formed on the lens are integrally formed and function as an aspherical lens as a whole) is considered as a single lens, not as a combined lens. Unless otherwise specified, the symbols and surface shapes of the refractive power associated with lenses that include aspherical surfaces are the same as those of the paraxial region.

[0212] In this specification, "the entire system" refers to a zoom optical system. The "focal length" used in the conditions is the paraxial focal length. Unless otherwise specified, the "distance on the optical axis" used in the conditions is the geometric distance. Unless otherwise specified, the values ​​used in the conditions are based on the d-line when focused on an object at infinity.

[0213] -Invention Effects-

[0214] According to the present invention, a zoom optical system with a small structure and good optical performance throughout the zoom range, and a camera device having the zoom optical system, can be provided. Attached Figure Description

[0215] Figure 1 is a cross-sectional view and a diagram showing the structure and movement trajectory of a zoom optical system corresponding to the zoom optical system of Embodiment 1 and an embodiment thereof.

[0216] Figure 2 is a cross-sectional view of the structure of the zoom optical system of Figure 1, and is a diagram used to illustrate the notation of the conditional expressions.

[0217] Figure 3 is a diagram illustrating the location of the maximum effective diameter.

[0218] Figure 4 shows the aberration diagrams of the zoom optical system in Example 1.

[0219] Figure 5 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 2.

[0220] Figure 6 shows the aberration diagrams of the zoom optical system in Example 2.

[0221] Figure 7 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 3.

[0222] Figure 8 shows the aberration diagrams of the zoom optical system in Example 3.

[0223] Figure 9 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 4.

[0224] Figure 10 shows the aberration diagrams of the zoom optical system in Example 4.

[0225] Figure 11 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 5.

[0226] Figure 12 is a diagram of the aberrations of the zoom optical system in Example 5.

[0227] Figure 13 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 6.

[0228] Figure 14 is a diagram of the aberrations of the zoom optical system of Example 6.

[0229] Figure 15 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 7.

[0230] Figure 16 is a diagram of the aberrations of the zoom optical system in Example 7.

[0231] Figure 17 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 8.

[0232] Figure 18 is a diagram of the aberrations of the zoom optical system of Example 8.

[0233] Figure 19 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 9.

[0234] Figure 20 is a diagram of the aberrations of the zoom optical system of Example 9.

[0235] Figure 21 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 10.

[0236] Figure 22 is a diagram of the aberrations of the zoom optical system of Example 10.

[0237] Figure 23 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 11.

[0238] Figure 24 shows the aberration diagrams of the zoom optical system in Example 11.

[0239] Figure 25 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 12.

[0240] Figure 26 shows the aberration diagrams of the zoom optical system in Example 12.

[0241] Figure 27 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 13.

[0242] Figure 28 shows the aberration diagrams of the zoom optical system in Example 13.

[0243] Figure 29 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 14.

[0244] Figure 30 shows the aberration diagrams of the zoom optical system in Example 14.

[0245] Figure 31 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 15.

[0246] Figure 32 shows the aberration diagrams of the zoom optical system in Example 15.

[0247] Figure 33 is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 16.

[0248] Figure 34 shows the aberration diagrams of the zoom optical system in Example 16.

[0249] Figure 35 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 17.

[0250] Figure 36 shows the aberration diagrams of the zoom optical system in Example 17.

[0251] Figure 37 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 18.

[0252] Figure 38 is a diagram of the aberrations of the zoom optical system of Example 18.

[0253] Figure 39 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 19.

[0254] Figure 40 shows the aberration diagrams of the zoom optical system in Example 19.

[0255] Figure 41 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 20.

[0256] Figure 42 is a diagram of the aberrations of the zoom optical system of Example 20.

[0257] Figure 43 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 21.

[0258] Figure 44 is a diagram of the aberrations of the zoom optical system of Example 21.

[0259] Figure 45 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 22.

[0260] Figure 46 is a diagram of the aberrations of the zoom optical system of Example 22.

[0261] Figure 47 is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 23.

[0262] Figure 48 shows the aberration diagrams of the zoom optical system in Example 23.

[0263] Figure 49 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 24.

[0264] Figure 50 shows the aberration diagrams of the zoom optical system in Example 24.

[0265] Figure 51 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 25.

[0266] Figure 52 is a diagram of the aberrations of the zoom optical system of Example 25.

[0267] Figure 53 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 26.

[0268] Figure 54 is a diagram of the aberrations of the zoom optical system of Example 26.

[0269] Figure 55 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 27.

[0270] Figure 56 shows the aberration diagrams of the zoom optical system in Example 27.

[0271] Figure 57 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 28.

[0272] Figure 58 shows the aberration diagrams of the zoom optical system in Example 28.

[0273] Figure 59 is a cross-sectional view of the structure and a diagram of the movement trajectory of the zoom optical system of Embodiment 29.

[0274] Figure 60 shows the aberration diagrams of the zoom optical system in Example 29.

[0275] Figure 61 is a cross-sectional view and a diagram showing the structure and movement trajectory of the zoom optical system of Embodiment 30.

[0276] Figure 62 is a diagram of the aberrations of the zoom optical system of Example 30.

[0277] Figure 63 is a perspective view of the front side of a camera device according to one embodiment.

[0278] Figure 64 is a perspective view of the rear side of a camera device according to one embodiment. Detailed Implementation

[0279] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0280] Figure 1 shows the structure, cross-sectional view, and movement trajectory of the zoom optical system according to an embodiment of the present invention. Figure 2 shows a cross-sectional view of the structure of the zoom optical system of Figure 1. In Figures 1 and 2, the state of focusing on an object at infinity is shown, with the left side being the object side and the right side being the image side. In Figures 1 and 2, the upper section labeled "Wide" shows the wide-angle end state, and the lower section labeled "Tele" shows the telephoto end state. In Figure 1, the beams are shown as the on-axis beam and the beam with the maximum half angle ωw at the wide-angle end, and the beam with the on-axis beam and the maximum half angle ωt at the telephoto end. The examples shown in Figures 1 and 2 correspond to the zoom optical system of Embodiment 1 described later. Hereinafter, the description will mainly refer to Figure 1, and Figure 2 will be referred to as needed.

[0281] The zoom optical system of the present invention, along the optical axis Z from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM composed of two or fewer lens groups with negative refractive power, and a subsequent group GR composed of multiple lens groups. The lens group closest to the object side in the subsequent group GR has positive refractive power. During zooming, the first lens group G1 moves, and the spacing between all adjacent lens groups within the zoom optical system changes. This structure facilitates the suppression of various aberrations throughout the zoom region.

[0282] In particular, setting the first lens group G1 to have positive refractive power facilitates miniaturization. Furthermore, by setting the first lens group G1 to have positive refractive power, the height of the light rays incident on the intermediate group GM from the optical axis Z can be reduced, thus helping to suppress aberration variations during zooming. By setting the first lens group G1 to have positive refractive power and configuring the intermediate group GM to consist of one or two lens groups with negative refractive power, it is advantageous to suppress various aberrations while zooming. By moving multiple lens groups, including the first lens group G1, during zooming, it is beneficial to suppress various aberrations throughout the entire zoom region.

[0283] Furthermore, in this specification, a lens group is defined as a group whose optical axis spacing changes during zooming. During zooming, the spacing between adjacent lenses within a lens group remains unchanged. That is, a "lens group" is a component of the zoom optical system and includes at least one lens separated by an air gap that changes during zooming. Lenses are moved or fixed individually during zooming. A "lens group" may include components other than lenses that do not have refractive power (e.g., aperture stops St, etc.).

[0284] As an example, the zoom optical system shown in Figure 1 is configured as follows: The first lens group G1 consists of two lenses. The middle group GM consists of one lens group with three lenses. The subsequent groups GR, from the object side to the image side, consist of three lens groups in sequence: the first subsequent lens group GR1 consisting of an aperture stop St and five lenses; the second subsequent lens group GR2 consisting of two lenses; and the third subsequent lens group GR3 consisting of two lenses. Note that the aperture stop St shown in Figure 1 does not represent size or shape, but rather its position on the optical axis.

[0285] In the example of Figure 1, during zooming, the spacing between the first lens group G1, the intermediate group GM, the first subsequent lens group GR1, the second subsequent lens group GR2, and the third subsequent lens group GR3 and the adjacent lens groups is changed and moved along the optical axis Z.

[0286] In Figure 1, between the Wide and Tele plots, solid arrows represent the approximate movement trajectories of each lens group during zooming from the wide-angle end to the telephoto end.

[0287] Furthermore, the example shown in Figure 1 is just one illustration; the zoom optical system of the present invention can be modified in various ways without departing from the spirit of the invention. The preferred structure and achievable structures of the zoom optical system of the present invention will be described below.

[0288] The first lens group G1 preferably includes a negative lens and a positive lens. This configuration is advantageous for correcting chromatic aberration.

[0289] The first lens group G1 preferably comprises a combined lens consisting of a negative meniscus lens with its convex surface facing the object side and a positive lens with its convex surface facing the object side, joined sequentially from the object side. This configuration is advantageous for correcting magnification chromatic aberration at the wide-angle end and on-axis chromatic aberration at the telephoto end.

[0290] The intermediate group GM preferably includes three negative lenses. This configuration helps to ensure the zoom ratio.

[0291] The intermediate group GM preferably includes an Lmn lens with negative refractive power. The object-side surface of the Lmn lens is aspherical, and the refractive power of this aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared to the refractive power in the paraxial region. This shape helps to suppress astigmatism variations during zooming. In the example of Figure 1, the lens closest to the object side of the intermediate group GM corresponds to the Lmn lens with the aforementioned aspherical surface. The object-side surface of the Lmn lens can be configured to be concave in the paraxial region and convex at the periphery including the position of maximum effective diameter. This configuration also helps to suppress astigmatism variations during zooming.

[0292] Here, referring to Figure 3, the "position of the maximum effective diameter" in this specification will be explained. Figure 3 is an illustrative diagram. In Figure 3, the left side is the object side, and the right side is the image side. Figure 3 shows the on-axis beam Xa and off-axis beam Xb passing through the lens Lx. In the example of Figure 3, the upper ray of the off-axis beam Xb, i.e., ray Xb1, is the outermost ray passing through. Here, "outer side" refers to the radially outer side centered on the optical axis Z, i.e., the side away from the optical axis Z. In this specification, the position of the intersection of this outermost ray and the lens surface is the position Px of the maximum effective diameter. Furthermore, twice the distance from the position Px of the maximum effective diameter to the optical axis Z is the effective diameter ED of the object-side surface of the lens Lx. In addition, in the example of Figure 3, the upper ray of the off-axis beam Xb is the outermost ray passing through, but which ray is the outermost ray varies depending on the optical system.

[0293] Furthermore, the phrase "the refractive power at the location of the maximum effective diameter is more positively shifted compared to the refractive power in the paraxial region" in this specification has the following meanings based on the sign of refractive power: When the surface has positive refractive power at both the paraxial region and the location of the maximum effective diameter, it indicates that the positive refractive power at the location of the maximum effective diameter is stronger than that in the paraxial region. When the surface has negative refractive power at both the paraxial region and the location of the maximum effective diameter, it indicates that the negative refractive power at the location of the maximum effective diameter is weaker than that in the paraxial region. When the surface has refractive power with different signs at the paraxial region and the location of the maximum effective diameter, it indicates that the surface has negative refractive power in the paraxial region and positive refractive power at the location of the maximum effective diameter.

[0294] The subsequent group GR can be configured to include an Lrn lens with negative refractive power. The image-side surface of the Lrn lens is aspherical, and the refractive power of this aspherical surface at the location of the maximum effective diameter is shifted in the positive direction compared to the refractive power in the paraxial region. By adopting this shape, it is beneficial to reduce the incident angle of the principal ray of the off-axis beam towards the image plane Sim. The image-side surface of the Lrn lens can be configured to be concave in the paraxial region and convex at the periphery including the location of the maximum effective diameter.

[0295] In this case, it is beneficial to shorten the total optical length and reduce the incident angle of the principal ray of the off-axis beam toward the image plane Sim.

[0296] It can be configured such that at least one focusing group is arranged in the subsequent lens group GR, which moves along the optical axis Z during focusing. Focusing is achieved by moving the focusing group. In the example of Figure 1, the focusing group consists of the second subsequent lens group GR2. The brackets and left-right arrows of the second subsequent lens group GR2 in the lower part of Figure 1 indicate that the second subsequent lens group GR2 is the focusing group and the direction of movement when focusing from an object at infinity to the nearest object. In addition, the focusing group functions throughout the entire zoom range, including the wide-angle end, but in Figure 1, to avoid complicating the diagram, the above arrows are only shown in the lower part of the diagram.

[0297] The zoom optical system in Figure 1 example includes only one focusing group, but the zoom optical system of the present invention can also include multiple focusing groups. For example, two focusing groups that move by changing their mutual spacing during focusing can be configured in a subsequent group GR. In this case, the amount of movement of each focusing group during focusing can be suppressed. When one or more focusing groups included in the zoom optical system are configured only in the subsequent group GR, the breathing effect caused by focusing can be suppressed. One focusing group can be configured as a whole consisting of one lens group. In this case, it is advantageous to simplify the drive mechanism.

[0298] As shown in the embodiments described later, an anti-shake group can be configured in the subsequent group GR to move in a direction intersecting the optical axis Z when correcting image shake. Image shake correction is performed by moving the anti-shake group. The anti-shake group can be configured in the subsequent group GR at a position closer to the object than the focusing group. In this case, it is beneficial to reduce the diameter of the anti-shake group. The anti-shake group can be configured to consist of a single lens or a combined lens. With such a configuration, it is beneficial to reduce the weight of the anti-shake group.

[0299] In addition, the lens corresponding to the focusing group and the lens corresponding to the vibration damping group can also be set to different lenses than the example in Figure 1.

[0300] In the example of Figure 1, all lens groups move during zooming. However, in the zoom optical system of the present invention, it can be configured to include at least one lens group that is fixed relative to the image plane Sim during zooming. In this case, the number of cams that move the lens groups can be reduced, thus simplifying the drive mechanism. Figure 1 shows an example of a zoom optical system as a zoom lens, but the zoom optical system of the present invention can be either a zoom lens or a variable focal length lens.

[0301] Next, preferred structures and achievable structures related to the conditional expressions of the zoom optical system of the present invention will be described. Furthermore, in the descriptions related to the following conditional expressions, to avoid lengthy explanations, the same symbols will be used for the same definitions, and repeated explanations of symbols will be omitted. To avoid lengthy explanations, "the zoom optical system of the present invention" will also be simply referred to as "zoom optical system" below.

[0302] The zoom optical system preferably satisfies the following condition (1). Here, TLw is defined as the sum of the distance along the optical axis from the lens surface closest to the object in the first lens group G1 to the lens surface closest to the image in the subsequent group GR, when the object is focused at the wide-angle end. ft is defined as the focal length of the entire system when the object is focused at the telephoto end. ωt is defined as the maximum half-angle view when the object is focused at the telephoto end. tan is the tangent. TLw is the total optical length when the object is focused at the wide-angle end. As an example, the total optical length TLw is shown in Figure 2. By ensuring that the corresponding value of condition (1) is not below the lower limit, it is beneficial to suppress various aberrations throughout the zoom region. By ensuring that the corresponding value of condition (1) is not above the upper limit, it is beneficial to miniaturize the entire optical system.

[0303] 2.9<TLw / (ft×tanωt)<7 (1)

[0304] To obtain better characteristics, the lower limit of condition (1) is more preferably set to 3.2, further preferably 3.5, and even more preferably 3.8. To obtain better characteristics, the upper limit of condition (1) is more preferably set to 6.5, further preferably 6, and even more preferably 5.5. For example, the zoom optical system more preferably satisfies the following condition (1-1).

[0305] 3.5<TLw / (ft×tanωt)<6 (1-1)

[0306] The zoom optical system preferably satisfies the following condition (2). Here, the back focal length of the entire system at the air-converted distance when focusing on an object at infinity at the wide-angle end is defined as Bfw. The back focal length, measured in air-converted distance, is the air-converted distance along the optical axis from the lens surface closest to the image side of the zoom optical system to the image plane Sim. As an example, the aforementioned back focal length Bfw is shown in Figure 2. By ensuring that the corresponding value of condition (2) is not below the lower limit, the aforementioned back focal length Bfw will not become too short, thus facilitating the installation of a bayonet replacement mechanism. By ensuring that the corresponding value of condition (2) is not above the upper limit, the aforementioned back focal length Bfw will not become too long, thus facilitating miniaturization.

[0307] 0.4<Bfw / (ft×tanωt)<1.5 (2)

[0308] To obtain better properties, the lower limit of condition (2) is more preferably set to 0.42, more preferably 0.44, more preferably 0.46, and more preferably 0.48. To obtain better properties, the upper limit of condition (2) is more preferably set to 1.4, more preferably 1.3, more preferably 1.25, and more preferably 1.2.

[0309] The zoom optical system preferably satisfies the following condition (3). By ensuring that the corresponding value of condition (3) is not below the lower limit, it is beneficial to suppress various aberrations throughout the zoom range. By ensuring that the corresponding value of condition (3) is not above the upper limit, it is beneficial to miniaturize the entire optical system or to obtain a sufficient zoom ratio as a zoom optical system.

[0310] 0.05 < (fw × TLw) / (ft) 2 ×FNow)<0.23 (3)

[0311] To obtain better characteristics, the lower limit of condition (3) is more preferably set to 0.06, more preferably 0.07, more preferably 0.08, and more preferably 0.1. To obtain better characteristics, the upper limit of condition (3) is more preferably set to 0.2, more preferably 0.18, more preferably 0.165, and more preferably 0.16. For example, the zoom optical system more preferably satisfies the following condition (3-1), and more preferably satisfies the following condition (3-2).

[0312] 0.08 < (fw × TLw) / (ft) 2 ×FNow) < 0.165 (3-1)

[0313] 0.1 < (fw × TLw) / (ft) 2 ×FNow) < 0.16 (3-2)

[0314] When the maximum half-angle of focusing on an object at infinity at the wide-angle end is set to ωw, the zoom optical system preferably satisfies the following condition (4). By ensuring that the corresponding value of condition (4) is not below the lower limit, it is easy to expand the angle of view at the wide-angle end and reduce the open F-value at the wide-angle end. By ensuring that the corresponding value of condition (4) is not above the upper limit, it is beneficial to obtain good optical performance and suppress the increase in the number of lenses and the enlargement of the optical system.

[0315] 0.15<tanωw / FNow<0.5 (4)

[0316] To obtain better characteristics, the lower limit of condition (4) is more preferably set to 0.17, more preferably 0.19, more preferably 0.21, more preferably 0.23, and more preferably 0.25. To obtain better characteristics, the upper limit of condition (4) is more preferably set to 0.42, more preferably 0.38, more preferably 0.35, more preferably 0.34, and more preferably 0.33. For example, a zoom optical system more preferably satisfies the following condition (4-1).

[0317] 0.21<tanωw / FNow<0.35 (4-1)

[0318] The zoom optical system preferably satisfies the following condition (5). By ensuring that the corresponding value of condition (5) is not below the lower limit, it is beneficial to the miniaturization of the entire optical system, or especially beneficial to suppressing various aberrations at the wide-angle end. By ensuring that the corresponding value of condition (5) is not above the upper limit, it is easy to obtain sufficient brightness at the wide-angle end.

[0319] 0.65<FNow / (ft / fw)<1.6 (5)

[0320] To obtain better characteristics, the lower limit of condition (5) is more preferably set to 0.7, more preferably 0.75, more preferably 0.8, more preferably 0.85, and more preferably 0.9. To obtain better characteristics, the upper limit of condition (5) is more preferably set to 1.52, more preferably 1.44, more preferably 1.36, more preferably 1.28, more preferably 1.23, and more preferably 1.2. For example, a zoom optical system more preferably satisfies the following condition (5-1).

[0321] 0.85<FNow / (ft / fw)<1.28 (5-1)

[0322] When the focal length of the first lens group G1 is set to f1, the zoom optical system preferably satisfies the following condition (6). By ensuring that the corresponding value of condition (6) is not below the lower limit, it is beneficial to shorten the total optical length. By ensuring that the corresponding value of condition (6) is not above the upper limit, it is beneficial to ensure the field of view at the wide-angle end.

[0323] 0.02 < fw / f1 < 0.3 (6)

[0324] To obtain better characteristics, the lower limit of condition (6) is more preferably set to 0.03, more preferably 0.04, more preferably 0.045, more preferably 0.048, more preferably 0.049, and more preferably 0.05. To obtain better characteristics, the upper limit of condition (6) is more preferably set to 0.25, more preferably 0.2, more preferably 0.165, more preferably 0.14, more preferably 0.135, and more preferably 0.13. For example, the zoom optical system more preferably satisfies the following condition (6-1), and more preferably satisfies the following condition (6-2).

[0325] 0.048<fw / f1<0.14 (6-1)

[0326] 0.05 < fw / f1 < 0.13 (6-2)

[0327] The zoom optical system preferably satisfies the following condition (7). Here, the focal length of the intermediate group GM is set to fMw when focusing on an object at infinity at the wide-angle end. By ensuring that the corresponding value of condition (7) is not below the lower limit, the refractive power of the intermediate group GM will not become too weak, thus easily suppressing the amount of movement of the intermediate group GM during zooming. By ensuring that the corresponding value of condition (7) is not above the upper limit, the refractive power of the first lens group G1 will not become too weak, thus easily suppressing the enlargement of the first lens group G1.

[0328] 4.5<f1 / (-fMw)<14 (7)

[0329] To obtain better characteristics, the lower limit of condition (7) is more preferably set to 5, further preferably 5.3, further preferably 5.5, and further preferably 5.7. To obtain better characteristics, the upper limit of condition (7) is more preferably set to 12, further preferably 10, further preferably 9, and further preferably 8.7. For example, the zoom optical system more preferably satisfies the following condition (7-1).

[0330] 5.7<f1 / (-fMw)<8.7 (7-1)

[0331] The zoom optical system preferably satisfies the following condition (8). By ensuring that the corresponding value of condition (8) is not below the lower limit, the refractive power of the intermediate group GM will not become too strong, thus suppressing the amount of aberration caused by image plane curvature in the intermediate group GM, which is beneficial for aberration correction during zooming. By ensuring that the corresponding value of condition (8) is not above the upper limit, the refractive power of the intermediate group GM will not become too weak, thus suppressing the amount of movement of the intermediate group GM during zooming. As a result, the total optical length will not become too long, which is beneficial for miniaturization.

[0332] 0.3 < (-fMw) / (fw × ft) 1 / 2 <1.4 (8)

[0333] To obtain better characteristics, the lower limit of condition (8) is more preferably set to 0.4, more preferably 0.5, and even more preferably 0.6. To obtain better characteristics, the upper limit of condition (8) is more preferably set to 1.2, more preferably 1, and even more preferably 0.9. For example, the zoom optical system more preferably satisfies the following condition (8-1).

[0334] 0.6 < (-fMw) / (fw × ft) 1 / 2 <0.9 (8-1)

[0335] The zoom optical system preferably satisfies the following condition (9). Here, the open F-value when focusing on an object at infinity at the telephoto end is set to FNot. By ensuring that the corresponding value of condition (9) is not below the lower limit, it is beneficial to achieve high performance. By ensuring that the corresponding value of condition (9) is not above the upper limit, the refractive power of the first lens group G1 will not become too weak, thus facilitating the miniaturization of the first lens group G1.

[0336] 5<f1 / (ft / FNot)<20 (9)

[0337] To obtain better characteristics, the lower limit of condition (9) is more preferably set to 6, more preferably 6.5, and more preferably 7. To obtain better characteristics, the upper limit of condition (9) is more preferably set to 16, more preferably 13, and more preferably 11. For example, the zoom optical system more preferably satisfies the following condition (9-1).

[0338] 7<f1 / (ft / FNot)<11 (9-1)

[0339] The zoom optical system preferably satisfies the following condition (10). By ensuring that the corresponding value of condition (10) is not below the lower limit, it is beneficial to suppress various aberrations. By ensuring that the corresponding value of condition (10) is not above the upper limit, it is beneficial to shorten the total optical length.

[0340] 2.5 < TLw / fw < 8 (10)

[0341] To obtain better characteristics, the lower limit of condition (10) is more preferably set to 3, further preferably 3.5, and even more preferably 4. To obtain better characteristics, the upper limit of condition (10) is more preferably set to 7, further preferably 6, and even more preferably 5.6. For example, the zoom optical system more preferably satisfies the following condition (10-1).

[0342] 3.5 < TLw / fw < 6 (10-1)

[0343] The zoom optical system preferably satisfies the following condition (11). Here, TLt is defined as the sum of the distance along the optical axis from the lens surface closest to the object in the first lens group G1 to the lens surface closest to the image in the subsequent group GR, when the object is focused at infinity at the telephoto end, and the back focal length of the entire system in air-converted distance. TLt is the total optical length when the object is focused at infinity at the telephoto end. As an example, the aforementioned total optical length TLt is shown in Figure 2. By ensuring that the corresponding value of condition (11) is not below the lower limit, it is beneficial to miniaturize the entire optical system, and especially beneficial to suppress aberrations at the telephoto end. By ensuring that the corresponding value of condition (11) is not above the upper limit, it is beneficial to reduce the F-value at the telephoto end while miniaturizing the total optical length TLt.

[0344] 8<FNot×(TLt / ft)<17 (11)

[0345] To obtain better properties, the lower limit of condition (11) is more preferably set to 9, and even more preferably to 10. To obtain better properties, the upper limit of condition (11) is more preferably set to 15, and even more preferably to 14.

[0346] When the focal length of the lens group closest to the object in the subsequent group GR is set to fR1, the zoom optical system preferably satisfies the following condition (12). By ensuring that the corresponding value of condition (12) is not below the lower limit, the positive refractive power of the lens group closest to the object in the subsequent group GR will not become too weak, thus helping to suppress variations in spherical aberration during zooming. By ensuring that the corresponding value of condition (12) is not above the upper limit, the positive refractive power of the lens group closest to the object in the subsequent group GR will not become too strong, thus particularly suppressing overcorrection of spherical aberration at the wide-angle end.

[0347] 1.5 < f1 / fR1 < 17 (12)

[0348] To obtain better properties, the lower limit of condition (12) is more preferably set to 3, and even more preferably to 5. To obtain better properties, the upper limit of condition (12) is more preferably set to 13, and even more preferably to 10.

[0349] The zoom optical system preferably satisfies the following condition (13). By ensuring that the corresponding value of condition (13) is not below the lower limit, it is easy to suppress various aberrations at the wide-angle end. By ensuring that the corresponding value of condition (13) is not above the upper limit, it is easy to shorten the total optical length TLw at the wide-angle end.

[0350] 1.2 < TLw / ft < 2.2 (13)

[0351] To obtain better properties, the lower limit of condition (13) is more preferably set to 1.3, and even more preferably 1.4. To obtain better properties, the upper limit of condition (13) is more preferably set to 2, and even more preferably 1.8.

[0352] The zoom optical system preferably satisfies the following condition (14). By ensuring that the corresponding value of condition (14) is not below the lower limit, the zoom ratio will not become too low, thus fully realizing the value of the zoom optical system. By ensuring that the corresponding value of condition (14) is not above the upper limit, the zoom ratio will not become too high, thus preventing the movement of the lens group during zooming from becoming too large, which is beneficial for the miniaturization of the entire optical system.

[0353] 2.8 < ft / fw < 4 (14)

[0354] To obtain better properties, the lower limit of condition (14) is more preferably set to 2.9, more preferably 3, and more preferably 3.1.

[0355] To obtain better properties, the upper limit of condition (14) is more preferably set to 3.7, more preferably 3.5, and more preferably 3.3.

[0356] The zoom optical system preferably satisfies the following condition (15). By ensuring that the corresponding value of condition (15) is not below the lower limit, the refractive power of the first lens group G1 will not become too strong, thus helping to suppress aberration variations during zooming. By ensuring that the corresponding value of condition (15) is not above the upper limit, the refractive power of the first lens group G1 will not become too weak, thus helping to miniaturize the first lens group G1.

[0357] 3 < f1 / (fw×ft) 1 / 2 <9 15)

[0358] To obtain better properties, the lower limit of condition (15) is more preferably set to 3.4, further preferably 3.7, and even more preferably 4. To obtain better properties, the upper limit of condition (15) is more preferably set to 7, further preferably 6, and even more preferably 5.

[0359] The zoom optical system preferably satisfies the following condition (16). By ensuring that the corresponding value of condition (16) is not below the lower limit, it is beneficial to suppress various aberrations throughout the zoom region. By ensuring that the corresponding value of condition (16) is not above the upper limit, the total optical length TLt at the telephoto end will not become too long, thus facilitating miniaturization.

[0360] 1.25 < TLt / TLw < 1.6 (16)

[0361] To obtain better properties, the lower limit of condition (16) is more preferably set to 1.35, and even more preferably 1.4. To obtain better properties, the upper limit of condition (16) is more preferably set to 1.55, and even more preferably 1.5.

[0362] The zoom optical system preferably satisfies the following condition (17). Here, the focal length of the subsequent group GR in the state of focusing on an object at infinity at the wide-angle end is set to fRw. By ensuring that the corresponding value of condition (17) is not below the lower limit, the total optical length TLw at the wide-angle end can be easily shortened, which is beneficial for miniaturization. By ensuring that the corresponding value of condition (17) is not above the upper limit, it is beneficial to suppress spherical aberration at the wide-angle end.

[0363] 0.3 < fw / fRw < 1.2 (17)

[0364] To obtain better properties, the lower limit of condition (17) is more preferably set to 0.5, and even more preferably 0.65. To obtain better properties, the upper limit of condition (17) is more preferably set to 1, and even more preferably 0.85.

[0365] The zoom optical system preferably satisfies the following condition (18). Here, the focal length of the subsequent group GR in the state of focusing on an object at infinity at the telephoto end is set to fRt. By ensuring that the corresponding value of condition (18) is not below the lower limit, the total optical length TLt at the telephoto end can be easily shortened, which is beneficial for miniaturization. By ensuring that the corresponding value of condition (18) is not above the upper limit, it is beneficial to suppress spherical aberration at the telephoto end.

[0366] 0.6 < ft / fRt < 5 (18)

[0367] To obtain better properties, the lower limit of condition (18) is more preferably set to 0.8, and even more preferably 0.9. To obtain better properties, the upper limit of condition (18) is more preferably set to 4, and even more preferably 3.

[0368] The zoom optical system preferably satisfies the following condition (19). By ensuring that the corresponding value of condition (19) does not fall below the lower limit, the refractive power of the lens group closest to the object side of the subsequent group GR will not become too strong, thus helping to suppress aberration changes during zooming.

[0369] By ensuring that the corresponding value of condition (19) does not exceed the upper limit, the refractive power of the lens group closest to the object side of the subsequent group GR will not become too weak, thus facilitating miniaturization.

[0370] 0.05 < fR1 / (fw×ft) 1 / 2 <3 (19)

[0371] To obtain better properties, the lower limit of condition (19) is more preferably set to 0.15, more preferably 0.25, and more preferably 0.3. To obtain better properties, the upper limit of condition (19) is more preferably set to 2, more preferably 1.5, and more preferably 1.

[0372] The zoom optical system preferably satisfies the following condition (20). By ensuring that the corresponding value of condition (20) is not below the lower limit, the positive refractive power of the lens group closest to the object in the subsequent group GR will not become too weak, which is particularly beneficial for the correction of spherical aberration at the wide-angle end. By ensuring that the corresponding value of condition (20) is not above the upper limit, the positive refractive power of the lens group closest to the object in the subsequent group GR will not become too strong, which is beneficial for suppressing the variation of spherical aberration during zooming.

[0373] 0.15 < fw / fR1 < 2 (20)

[0374] To obtain better properties, the lower limit of condition (20) is more preferably set to 0.2, further preferably 0.25, and even more preferably 0.3. To obtain better properties, the upper limit of condition (20) is more preferably set to 1.5, further preferably 1.2, and even more preferably 1.

[0375] In the structure of the subsequent group GR with the above-mentioned anti-vibration group, the zoom optical system preferably satisfies the following condition (21). Here, the focal length of the anti-vibration group is set to fIS. By ensuring that the corresponding value of condition (21) is not below the lower limit, it is beneficial to correct various aberrations. By ensuring that the corresponding value of condition (21) is not above the upper limit, the refractive power of the anti-vibration group can be ensured, thus easily suppressing the amount of movement of the anti-vibration group during image jitter correction, which is beneficial for miniaturization.

[0376] 0.2 < |fIS / ft| < 2 (21)

[0377] To obtain better properties, the lower limit of condition (21) is more preferably set to 0.3, further preferably 0.4, and even more preferably 0.5. To obtain better properties, the upper limit of condition (21) is more preferably set to 1.6, further preferably 1.2, and even more preferably 1.

[0378] In the structure of the following focusing group configured in the subsequent group GR, the zoom optical system preferably satisfies the following conditional expression (22). Here, the focal length of at least one focusing group is set to ff. By ensuring that the corresponding value of conditional expression (22) is not below the lower limit, it is beneficial to correct various aberrations. By ensuring that the corresponding value of conditional expression (22) is not above the upper limit, the refractive power of the focusing group can be ensured, and thus the amount of movement of the focusing group during focusing can be easily suppressed, thereby facilitating miniaturization.

[0379] 0.2 < |ff / ft| < 1.4 (22)

[0380] To obtain better properties, the lower limit of condition (22) is more preferably set to 0.3, more preferably 0.4, and more preferably 0.45. To obtain better properties, the upper limit of condition (22) is more preferably set to 1.2, more preferably 1, and more preferably 0.85.

[0381] In the structure of the first lens group G1 including the joint lens, the zoom optical system preferably satisfies the following condition (23), wherein the joint lens is sequentially joined from the object side to a negative meniscus lens with the convex surface facing the object side and a positive lens with the convex surface facing the object side.

[0382] Here, the refractive index of the negative meniscus lens of the first lens group G1 relative to the d-line and the Abbe number of the d-line reference are set as Ndn and νdn, respectively. By ensuring that the corresponding value of conditional expression (23) is not below the lower limit, materials other than those with low refractive index and low Abbe number can be selected, thus making it easy to correct chromatic aberration at the wide-angle end. By ensuring that the corresponding value of conditional expression (23) is not above the upper limit, materials other than those with high refractive index and high Abbe number can be selected, thus making it easy to select materials with low specific gravity and thus making it easy to reduce weight. Alternatively, since the difference in Abbe number between the positive and negative lenses constituting the first lens group G1 will not become too small, the refractive power of each lens constituting the first lens group G1 will not become stronger. As a result, higher-order aberrations of spherical aberration at the telephoto end can be easily corrected. In addition, in this specification, "higher-order" in aberration refers to 5th order or higher.

[0383] 1.94<Ndn+0.01×νdn<2.5 (23)

[0384] To obtain better properties, the lower limit of condition (23) is more preferably set to 2, and even more preferably 2.04. To obtain better properties, the upper limit of condition (23) is more preferably set to 2.35, and even more preferably 2.3.

[0385] In the structure of the first lens group G1 including the joint lens, the zoom optical system preferably satisfies the following condition (24), wherein the joint lens is sequentially joined from the object side with a negative meniscus lens with its convex surface facing the object side and a positive lens with its convex surface facing the object side. Here, the refractive index of the positive lens of the first lens group G1 relative to the d-line and the Abbe number of the d-line reference are set to Ndp and νdp, respectively. By ensuring that the corresponding value of condition (24) is not below the lower limit, materials other than those with low refractive index and low Abbe number can be selected, thus suppressing the increase of higher-order aberrations of spherical aberration at the telephoto end, thereby facilitating performance improvement. Alternatively, insufficient correction of axial chromatic aberration at the telephoto end can be suppressed. By ensuring that the corresponding value of condition (24) is not above the upper limit, materials other than those with high refractive index and high Abbe number can be selected, thus allowing the selection of materials with low specific gravity, thereby facilitating weight reduction. Alternatively, excessive correction of axial chromatic aberration at the telephoto end can be suppressed.

[0386] 2<Ndp+0.01×νdp<2.6 (24)

[0387] To obtain better properties, the lower limit of condition (24) is more preferably set to 2.1, and even more preferably 2.16. To obtain better properties, the upper limit of condition (24) is more preferably set to 2.45, and even more preferably 2.4.

[0388] When the average Abbe number of the d-line reference of all positive lenses in the first lens group G1 is set to νd1p_ave, the zoom optical system preferably satisfies the following condition (25). By ensuring that the corresponding value of condition (25) is not below the lower limit, it is particularly beneficial to correct axial chromatic aberration at the telephoto end. By ensuring that the corresponding value of condition (25) is not above the upper limit, it is beneficial to correct aberrations other than chromatic aberration.

[0389] 40 < νd1p_ave < 85 (25)

[0390] To obtain better properties, the lower limit of condition (25) is more preferably set to 50, and even more preferably 55. To obtain better properties, the upper limit of condition (25) is more preferably set to 75, and even more preferably 70.

[0391] When the sum of the thicknesses along the optical axis of all lenses in the first lens group G1 is set as d1sum, the zoom optical system preferably satisfies the following condition (26). By ensuring that the corresponding value of condition (26) is not below the lower limit value, it is beneficial to ensure the strength of the first lens group G1.

[0392] By ensuring that the corresponding value of condition (26) does not exceed the upper limit, it is beneficial to reduce the weight of the first lens group G1.

[0393] 0.01<d1sum / f1<0.2 (26)

[0394] To obtain better properties, the lower limit of condition (26) is more preferably set to 0.015, and even more preferably 0.02. To obtain better properties, the upper limit of condition (26) is more preferably set to 0.15, and even more preferably 0.12.

[0395] Furthermore, the number of lens groups included in the intermediate group GM and the subsequent group GR can be set to a different number than in the example of Figure 1. Also, the number of lenses included in each group can be set to a different number than in the example of Figure 1.

[0396] For example, the intermediate group GM can be configured as two lens groups. In this case, it is beneficial to suppress aberrations during zooming.

[0397] In the structure where the intermediate group GM consists of two lens groups with negative refractive power, the zoom optical system preferably satisfies the following condition (27). Here, the focal length of the lens group closest to the object side of the intermediate group GM is set to fM1. The focal length of the lens group closest to the image side of the intermediate group GM is set to fM2. By ensuring that the corresponding value of condition (27) is not below the lower limit, it is beneficial to suppress the variation of various aberrations during zooming. By ensuring that the corresponding value of condition (27) is not above the upper limit, it is beneficial to ensure the zoom ratio.

[0398] 0.01 < fM1 / fM2 < 1.6 (27)

[0399] To obtain better properties, the lower limit of condition (27) is more preferably set to 0.03, more preferably 0.05, more preferably 0.1, and more preferably 0.15. To obtain better properties, the upper limit of condition (27) is more preferably set to 1.4, more preferably 1.2, more preferably 1, and more preferably 0.8.

[0400] The subsequent lens group GR can be configured to consist of 3 lens groups, 4 lens groups, 5 lens groups, or 6 lens groups. Limiting the number of lens groups constituting the subsequent lens group GR to 3 makes it easier to shorten the overall optical length. Setting the number of lens groups constituting the subsequent lens group GR to 4 or more makes it easier to suppress aberrations during zooming. More specifically, the subsequent lens group GR can be configured, for example, as follows.

[0401] The subsequent lens group GR can be configured as follows, from the object side to the image side, consisting of a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group. In this way, by limiting the number of lens groups included in the subsequent lens group GR to three, the total optical length can be easily shortened.

[0402] In the structure of the subsequent lens group GR, which consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group in sequence from the object side to the image side, the zoom optical system preferably satisfies the following condition (28). Here, the focal length of the first subsequent lens group is set as fR1. The focal length of the second subsequent lens group is set as fR2.

[0403] 0.2<fR1 / (-fR2)<2 (28)

[0404] By ensuring that the corresponding value of condition (28) is not below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of condition (28) is not above the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0405] To obtain better properties, the lower limit of condition (28) is more preferably set to 0.25, more preferably 0.3, more preferably 0.35, and more preferably 0.4. To obtain better properties, the upper limit of condition (28) is more preferably set to 1.5, more preferably 1.2, more preferably 1.1, and more preferably 1.

[0406] The subsequent lens group GR can be configured as follows, from the object side to the image side, consisting of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, and a third subsequent lens group with negative refractive power. In this way, by limiting the number of lens groups included in the subsequent lens group GR to three, the total optical length can be easily shortened.

[0407] In the structure of the subsequent lens group GR, which consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, and a third subsequent lens group with negative refractive power sequentially from the object side to the image side, the zoom optical system preferably satisfies at least one of the following conditions (29) and conditions (30). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3.

[0408] 0.4<fR2 / (-fR3)<3.7 (29)

[0409] 0.3 < fR1 / fR2 < 4 (30)

[0410] By ensuring that the corresponding value of condition (29) is not below the lower limit, the refractive power of the third subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of condition (29) is not above the upper limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0411] To obtain better properties, the lower limit of condition (29) is more preferably set to 0.5, more preferably 0.55, more preferably 0.58, and more preferably 0.6. To obtain better properties, the upper limit of condition (29) is more preferably set to 3.4, more preferably 3.2, more preferably 3, and more preferably 2.8.

[0412] By ensuring that the corresponding value of conditional expression (30) is not below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of conditional expression (30) is not above the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus facilitating the suppression of aberration variations during zoom.

[0413] To obtain better properties, the lower limit of condition (30) is more preferably set to 0.4, more preferably 0.5, more preferably 0.6, and more preferably 0.7. To obtain better properties, the upper limit of condition (30) is more preferably set to 3.5, more preferably 3.2, more preferably 3, and more preferably 2.8.

[0414] The subsequent lens group GR can be configured to sequentially include, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, a third subsequent lens group with positive refractive power, and a fourth subsequent lens group with negative refractive power. Thus, by including at least four lens groups in the subsequent lens group GR, aberration variations during zooming can be easily suppressed.

[0415] In a structure in which the subsequent lens group GR sequentially comprises, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, a third subsequent lens group with positive refractive power, and a fourth subsequent lens group with negative refractive power, the zoom optical system preferably satisfies at least one of the following conditional expressions (28A), (31), (32), and (33). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3. The focal length of the fourth subsequent lens group is set to fR4.

[0416] 0.2<fR1 / (-fR2)<1.5 (28A)

[0417] 0.3<(-fR2) / fR3<2.4 (31)

[0418] 0.1 < fR1 / fR3 < 1.4 (32)

[0419] 0.15<(-fR2) / (-fR4)<1.8 (33)

[0420] By ensuring that the corresponding value of conditional expression (28A) does not fall below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of conditional expression (28A) does not exceed the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0421] To obtain better characteristics, the lower limit of conditional expression (28A) is more preferably set to 0.25, further preferably 0.3, further preferably 0.35, and further preferably 0.4. To obtain better characteristics, the upper limit of conditional expression (28A) is more preferably set to 1.2, further preferably 1, further preferably 0.9, and further preferably 0.8.

[0422] By ensuring that the corresponding value of conditional expression (31) is not below the lower limit, the refractive power of the third subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of conditional expression (31) is not above the upper limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0423] To obtain better properties, the lower limit of condition (31) is more preferably set to 0.35, further preferably 0.4, further preferably 0.45, and further preferably 0.5. To obtain better properties, the upper limit of condition (31) is more preferably set to 2.1, further preferably 1.8, further preferably 1.5, and further preferably 1.3.

[0424] By ensuring that the corresponding value of condition (32) is not below the lower limit, the positive refractive power of the first subsequent lens group will not become too strong, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of condition (32) is not above the upper limit, the positive refractive power of the third subsequent lens group will not become too strong, thus facilitating the assurance of an appropriate back focal length.

[0425] To obtain better properties, the lower limit of condition (32) is more preferably set to 0.15, further preferably 0.2, further preferably 0.25, and further preferably 0.3. To obtain better properties, the upper limit of condition (32) is more preferably set to 1.1, further preferably 0.8, further preferably 0.6, and further preferably 0.5.

[0426] By ensuring that the corresponding value of conditional expression (33) is not below the lower limit, the negative refractive power of the fourth subsequent lens group will not become too weak, thus helping to prevent insufficient aberration correction during zoom. By ensuring that the corresponding value of conditional expression (33) is not above the upper limit, the negative refractive power of the fourth subsequent lens group will not become too strong, thus suppressing overcorrection of aberrations during zoom.

[0427] To obtain better properties, the lower limit of condition (33) is more preferably set to 0.2, more preferably 0.25, more preferably 0.3, and more preferably 0.35. To obtain better properties, the upper limit of condition (33) is more preferably set to 1.5, more preferably 1.3, more preferably 1.1, and more preferably 0.95.

[0428] The subsequent lens group GR can be configured to sequentially include, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, and a fourth subsequent lens group with positive refractive power. Thus, by including at least four lens groups in the subsequent lens group GR, aberration variations during zooming can be easily suppressed.

[0429] In a structure in which the subsequent lens group GR sequentially comprises, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, and a fourth subsequent lens group with positive refractive power, the zoom optical system preferably satisfies at least one of the following conditional expressions (34), (29A), (30A), and (35). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3. The focal length of the fourth subsequent lens group is set to fR4.

[0430] 0.4<fR1 / (-fR3)<2.5 (34)

[0431] 0.3<fR2 / (-fR3)<3.5 (29A)

[0432] 0.3 < fR1 / fR2 < 5 (30A)

[0433] 0.1 < fR2 / fR4 < 2 (35)

[0434] By ensuring that the corresponding value of condition (34) is not below the lower limit, the refractive power of the third subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of condition (34) is not above the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0435] To obtain better properties, the lower limit of condition (34) is more preferably set to 0.5, more preferably 0.6, more preferably 0.7, and more preferably 0.8. To obtain better properties, the upper limit of condition (34) is more preferably set to 2.2, more preferably 1.9, more preferably 1.7, and more preferably 1.5.

[0436] By ensuring that the corresponding value of conditional expression (29A) does not fall below the lower limit, the refractive power of the third subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of conditional expression (29A) does not exceed the upper limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0437] To obtain better characteristics, the lower limit of conditional expression (29A) is more preferably set to 0.35, further preferably 0.4, further preferably 0.45, and further preferably 0.5. To obtain better characteristics, the upper limit of conditional expression (29A) is more preferably set to 3, further preferably 2.6, further preferably 2.3, and further preferably 2.

[0438] By ensuring that the corresponding value of conditional expression (30A) does not fall below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of conditional expression (30A) does not exceed the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus facilitating the suppression of aberration variations during zooming.

[0439] To obtain better characteristics, the lower limit of conditional expression (30A) is more preferably set to 0.6, more preferably 0.9, more preferably 1.1, and more preferably 1.2. To obtain better characteristics, the upper limit of conditional expression (30A) is more preferably set to 4, more preferably 3.5, more preferably 3, and more preferably 2.5.

[0440] By ensuring that the corresponding value of conditional expression (35) is not below the lower limit, the refractive power of the fourth subsequent lens group will not become too weak, thus helping to prevent insufficient aberration correction during zoom. By ensuring that the corresponding value of conditional expression (35) is not above the upper limit, the refractive power of the fourth subsequent lens group will not become too strong, thus suppressing overcorrection of aberrations during zoom.

[0441] To obtain better properties, the lower limit of condition (35) is more preferably set to 0.2, more preferably 0.3, more preferably 0.35, and more preferably 0.4. To obtain better properties, the upper limit of condition (35) is more preferably set to 1.5, more preferably 1.1, more preferably 0.9, and more preferably 0.8.

[0442] The subsequent lens group GR can be configured such that, from the object side to the image side, it consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with positive refractive power, a fourth subsequent lens group, and a fifth subsequent lens group. By setting the number of lens groups constituting the subsequent lens group GR to five, it is easy to suppress aberration variations during zooming.

[0443] In the structure of the subsequent lens group GR, which consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with positive refractive power, a fourth subsequent lens group, and a fifth subsequent lens group, arranged sequentially from the object side to the image side, the zoom optical system preferably satisfies at least one of the following conditional expressions (30B) and (36). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3.

[0444] 0.1 < fR1 / fR2 < 4.5 (30B)

[0445] 0.2 < fR2 / fR3 < 3 (36)

[0446] By ensuring that the corresponding value of conditional expression (30B) does not fall below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of conditional expression (30B) does not exceed the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus facilitating the suppression of aberration variations during zooming.

[0447] To obtain better characteristics, the lower limit of conditional expression (30B) is more preferably set to 0.2, more preferably 0.3, more preferably 0.4, and more preferably 0.5. To obtain better characteristics, the upper limit of conditional expression (30B) is more preferably set to 3, more preferably 2, more preferably 1.3, and more preferably 0.9.

[0448] By ensuring that the corresponding value of condition (36) does not fall below the lower limit, the positive refractive power of the third subsequent lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of condition (36) does not exceed the upper limit, the positive refractive power of the second subsequent lens group will not become too weak, thus facilitating the suppression of aberration variations during zoom.

[0449] To obtain better properties, the lower limit of condition (36) is more preferably set to 0.3, more preferably 0.35, more preferably 0.4, and more preferably 0.45. To obtain better properties, the upper limit of condition (36) is more preferably set to 2, more preferably 1.5, more preferably 1, and more preferably 0.8.

[0450] The subsequent lens group GR can be configured such that, from the object side to the image side, it consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, a fourth subsequent lens group with negative refractive power, and a fifth subsequent lens group with positive refractive power. By setting the number of lens groups constituting the subsequent lens group GR to five, it is easy to suppress aberration variations during zooming.

[0451] In the structure of the subsequent lens group GR, which consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, a fourth subsequent lens group with negative refractive power, and a fifth subsequent lens group with positive refractive power, arranged sequentially from the object side to the image side, the zoom optical system preferably satisfies at least one of the following conditions (30C) and (37). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3. The focal length of the fourth subsequent lens group is set to fR4.

[0452] 0.2 < fR1 / fR2 < 4 (30°C)

[0453] 0.01 < fR3 / fR4 < 4 (37)

[0454] By ensuring that the corresponding value of conditional expression (30C) does not fall below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of conditional expression (30C) does not exceed the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus facilitating the suppression of aberration variations during zooming.

[0455] To obtain better characteristics, the lower limit of conditional expression (30C) is more preferably set to 0.25, further preferably 0.3, further preferably 0.35, and further preferably 0.4. To obtain better characteristics, the upper limit of conditional expression (30C) is more preferably set to 3.2, further preferably 2.5, further preferably 2, and further preferably 1.5.

[0456] By ensuring that the corresponding value of condition (37) is not below the lower limit, the refractive power of the fourth subsequent lens group will not become too weak, thus facilitating the correction of distortion aberrations. By ensuring that the corresponding value of condition (37) is not above the upper limit, the refractive power of the third subsequent lens group will not become too weak, thus facilitating the correction of aberrations during magnification.

[0457] To obtain better properties, the lower limit of condition (37) is more preferably set to 0.02, more preferably 0.03, more preferably 0.035, and more preferably 0.04. To obtain better properties, the upper limit of condition (37) is more preferably set to 3, more preferably 2, more preferably 1, and more preferably 0.5.

[0458] The subsequent lens group (GR) can be configured to sequentially include, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group with negative refractive power. Thus, by including at least three lens groups in the subsequent lens group (GR), aberration variations during zooming can be easily suppressed.

[0459] In a structure in which the subsequent lens group GR sequentially comprises, from the object side to the image side, at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group with negative refractive power, the zoom optical system preferably satisfies at least one of the following conditions (28B) and (38). Here, the focal length of the first subsequent lens group is set to fR1. The focal length of the second subsequent lens group is set to fR2. The focal length of the third subsequent lens group is set to fR3.

[0460] 0.2<fR1 / (-fR2)<1.8 (28B)

[0461] 0.05<(-fR2) / (-fR3)<1.2 (38)

[0462] By ensuring that the corresponding value of conditional expression (28B) does not fall below the lower limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of conditional expression (28B) does not exceed the upper limit, the refractive power of the first subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0463] To obtain better characteristics, the lower limit of conditional expression (28B) is more preferably set to 0.25, further preferably 0.3, further preferably 0.35, and further preferably 0.4. To obtain better characteristics, the upper limit of conditional expression (28B) is more preferably set to 1.5, further preferably 1.2, further preferably 1, and further preferably 0.9.

[0464] By ensuring that the corresponding value of conditional expression (38) is not below the lower limit, the refractive power of the third subsequent lens group will not become too weak, thus helping to suppress aberration variations during zoom. By ensuring that the corresponding value of conditional expression (38) is not above the upper limit, the refractive power of the second subsequent lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0465] To obtain better properties, the lower limit of condition (38) is more preferably set to 0.1, more preferably 0.15, more preferably 0.2, and more preferably 0.22. To obtain better properties, the upper limit of condition (38) is more preferably set to 0.9, more preferably 0.75, more preferably 0.6, and more preferably 0.5.

[0466] The above-mentioned preferred structures and possible structures can be combined arbitrarily within the range of non-contradiction, and preferably selected appropriately according to the required specifications.

[0467] As an example, in a preferred embodiment of the zoom optical system of the present invention, from the object side to the image side, it consists of a first lens group G1 with positive refractive power, an intermediate group GM composed of two or fewer lens groups with negative refractive power, and a subsequent group GR composed of multiple lens groups. The lens group closest to the object side of the subsequent group GR has positive refractive power. During zooming, the first lens group G1 moves, and all the intervals of adjacent lens groups change. The zoom optical system satisfies the above-mentioned conditions (1), (2), and (3).

[0468] Next, embodiments of the zoom optical system of the present invention will be described with reference to the accompanying drawings. Furthermore, the reference numerals labeled in each group of cross-sectional views of each embodiment are used independently in each embodiment to avoid complicating the description and drawings as the number of reference numerals increases. Therefore, even if the same reference numerals are used in the drawings of different embodiments, they do not necessarily represent the same structure.

[0469] [Example 1]

[0470] The structure and movement trajectory of the zoom optical system of Example 1 are shown in Figure 1. The illustration method and structure are as described above, so some repeated descriptions are omitted here. The zoom optical system of Example 1 consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR, arranged sequentially from the object side to the image side.

[0471] The intermediate group GM consists of a single lens group with negative refractive power. The subsequent groups GR, from the object side to the image side, consist sequentially of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, and a third subsequent lens group GR3 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0472] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of a second follower lens group GR2. When focusing from an object at infinity to the nearest object, the second follower lens group GR2 moves towards the object side, while the other lens groups remain fixed relative to the image plane Sim.

[0473] Regarding the zoom optical system of Example 1, the basic lens data is shown in Table 1, the specifications and variable surface spacing are shown in Table 2, and the aspherical coefficients are shown in Table 3.

[0474] The following table contains basic lens data. The Sn column shows the surface numbers, with the object-side surface designated as surface 1 and the numbers increasing sequentially towards the image side. The R column shows the radius of curvature of each surface. The D column shows the surface spacing along the optical axis between each surface and its image-side neighbor. The Nd column shows the refractive index of each component relative to the d-line. The νd column shows the Abbe number of each component based on the d-line. The θg,F columns show the partial dispersion ratio between the g-line and F-line of each component.

[0475] The effective diameter of each face is shown in the ED column.

[0476] Furthermore, when the refractive indices of a lens relative to the g-line, F-line, and C-line are set to Ng, NF, and NC respectively, and the partial dispersion ratio between the g-line and F-line of the lens is set to θg,F, θg,F is defined by the following formula.

[0477] θg,F=(Ng-NF) / (NF-NC)

[0478] The “d-line”, “C-line”, “F-line” and “g-line” described in this specification are bright lines. The wavelength of the d-line is considered to be 587.56 nm (nanometers), the wavelength of the C-line is considered to be 656.27 nm (nanometers), the wavelength of the F-line is considered to be 486.13 nm (nanometers), and the wavelength of the g-line is considered to be 435.84 nm (nanometers).

[0479] In the table of basic lens data, the radius of curvature of the surface that makes the protruding shape face the object side is marked as positive, and the radius of curvature of the surface that makes the protruding shape face the image side is marked as negative. In Table 1, the surface number and the term (St) are recorded in the surface number column corresponding to the aperture stop St. The value in the bottom column of column D in the table is the interval between the surface closest to the image side and the image plane Sim. Regarding the variable surface interval during zoom, the notation DD[ ] is used, and the object side surface number of this interval is marked in [ ] and recorded in the surface interval column.

[0480] Table 2 shows the zoom ratio Zr, focal length f, back focal length Bf, opening F-number FNo., maximum total angle of view 2ω, and variable plane spacing, with the d-line as the reference. When the zoom optical system is a zoom lens, the zoom ratio has the same meaning as the zoom magnification. The [°] in the 2ω column indicates the unit is degrees. In Table 2, the columns labeled "Wide," "Middle," and "Tele" show the values ​​for the wide-angle, middle focal length, and telephoto ends, respectively.

[0481] In the basic lens data, the aspherical surface number is marked with an asterisk (*), and the paraxial radius of curvature value is recorded in the radius of curvature column of the aspherical surface. In Table 3, the surface number of the aspherical surface is shown in row Sn, and the values ​​of the aspherical coefficients for each aspherical surface are shown in rows KA and Am. Furthermore, m in Am is an integer greater than or equal to 3 and varies from surface to surface. For example, in the fourth surface of Example 1, m = 4, 6, 8, 10. The aspherical coefficient values ​​in Table 3, “E±n” (n: integer), represent “×10”. ±n KA and Am are the aspheric coefficients in the aspheric formula expressed by the following equation.

[0482] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+ΣAm×h m

[0483] in,

[0484] Zd: Aspherical depth (the length of the perpendicular line drawn from a point on the aspherical surface at height h to a plane tangent to the vertex of the aspherical surface and perpendicular to the optical axis Z).

[0485] h: Height (distance from the optical axis Z to the lens surface)

[0486] C: The reciprocal of the paraxial radius of curvature

[0487] KA, Am: Aspheric coefficients

[0488] The aspherical Σ represents the summation related to m.

[0489] In the data in each table, degrees are used as the unit for angles and millimeters as the unit for lengths. However, optical systems can be used even at magnification or reduction scales, so other appropriate units can also be used. Furthermore, the values ​​shown in the tables below are rounded to a predetermined number of decimal places.

[0490]

[0491]

[0492]

[0493] Figure 4 shows the aberration diagrams of the zoom optical system of Embodiment 1 when focused on an object at infinity. From left to right, Figure 4 shows spherical aberration, astigmatism, distortion aberration, and chromatic aberration. The upper section labeled "Wide" shows the aberrations at the wide-angle end, the middle section labeled "Middle" shows the aberrations at the intermediate focal length, and the lower section labeled "Tele" shows the aberrations at the telephoto end.

[0494] In spherical aberration diagrams, aberrations along the d-line, C-line, and F-line are shown using solid lines, long dashed lines, and short dashed lines, respectively. In astigmatism diagrams, solid lines represent aberrations along the d-line in the sagittal direction, and short dashed lines represent aberrations along the d-line in the meridional direction. In distortion aberration diagrams, aberrations along the d-line are shown using solid lines. In chromatic aberration diagrams, long dashed lines and short dashed lines represent aberrations along the C-line and F-line, respectively. In spherical aberration diagrams, the open F-value is shown after FNo.=. In other aberration diagrams, the maximum half-angle value is shown after ω=.

[0495] The notations, meanings, recording methods, and illustration methods of the data related to Embodiment 1 above are basically the same in the following embodiments unless otherwise specified, so repeated descriptions are omitted below.

[0496] [Example 2]

[0497] The structure and movement trajectory of the zoom optical system of Embodiment 2 are shown in Figure 5. In Figure 5, for the lens group that is fixed relative to the image plane Sim during zooming, a dashed line in the vertical direction is shown instead of a solid arrow indicating the movement trajectory. This method of illustrating the lens group that is fixed relative to the image plane Sim during zooming is also used in the following embodiments. The zoom optical system of Embodiment 2 consists, from the object side to the image side, a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of one lens group with negative refractive power. The subsequent group GR consists, from the object side to the image side, a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with positive refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0498] When zooming from the wide-angle end to the telephoto end, the third subsequent lens group GR3 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups are fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1. The brackets and downward arrows of the lens closest to the image side of the first subsequent lens group GR1, labeled in Figure 5, indicate that this lens is the image stabilization group. In addition, the image stabilization group functions throughout the entire zoom range, including the wide-angle end, but in Figure 5, to avoid complicating the diagram, the aforementioned arrows are only shown in the lower section of the figure. This illustrated method related to the image stabilization group is also the same in the following embodiments.

[0499] Regarding the zoom optical system of Example 2, the basic lens data is shown in Table 4, the specifications and variable surface spacing are shown in Table 5, the aspherical coefficients are shown in Table 6, and the various aberrations are illustrated in Figure 6.

[0500]

[0501]

[0502]

[0503] [Example 3]

[0504] The structure and movement trajectory of the zoom optical system of Example 3 are shown in Figure 7. The zoom optical system of Example 3, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with negative refractive power. The second lens from the object side of the intermediate group GM corresponds to an Lmn lens. The lens constituting the second subsequent lens group GR2 corresponds to an Lrn lens.

[0505] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1.

[0506] Regarding the zoom optical system of Example 3, the basic lens data is shown in Table 7, the specifications and variable surface spacing are shown in Table 8, the aspherical coefficients are shown in Table 9, and the various aberrations are illustrated in Figure 8.

[0507]

[0508]

[0509]

[0510] [Example 4]

[0511] The structure and movement trajectory of the zoom optical system of Example 4 are shown in Figure 9. The zoom optical system of Example 4, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with positive refractive power.

[0512] The lens closest to the object in the middle group GM corresponds to the Lmn lens. The lens constituting the second subsequent lens group GR2 corresponds to the Lrn lens.

[0513] During zooming from the wide-angle end to the telephoto end, the third subsequent lens group GR3 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim.

[0514] Regarding the zoom optical system of Example 4, the basic lens data is shown in Table 10, the specifications and variable surface spacing are shown in Table 11, the aspherical coefficients are shown in Table 12, and the aberrations are illustrated in Figure 10.

[0515]

[0516]

[0517]

[0518] [Example 5]

[0519] The structure and movement trajectory of the zoom optical system of Example 5 are shown in Figure 11. The zoom optical system of Example 5, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with positive refractive power.

[0520] The second lens from the object side in the middle group GM corresponds to the Lmn lens. The lens closest to the image side in the second subsequent lens group GR2 corresponds to the Lrn lens.

[0521] When zooming from the wide-angle end to the telephoto end, the third subsequent lens group GR3 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups are fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1.

[0522] Regarding the zoom optical system of Example 5, the basic lens data is shown in Table 13, the specifications and variable surface spacing are shown in Table 14, the aspherical coefficients are shown in Tables 15A and 15B, and the aberrations are illustrated in Figure 12.

[0523]

[0524]

[0525]

[0526]

[0527] [Example 6]

[0528] The structure and movement trajectory of the zoom optical system of Example 6 are shown in Figure 13. The zoom optical system of Example 6, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with negative refractive power. The second lens from the object side of the intermediate group GM corresponds to the Lmn lens. The lens closest to the image side in the second subsequent lens group GR2 corresponds to the Lrn lens.

[0529] When zooming from the wide-angle end to the telephoto end, the third subsequent lens group GR3 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups are fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1.

[0530] Regarding the zoom optical system of Example 6, the basic lens data is shown in Table 16, the specifications and variable surface spacing are shown in Table 17, the aspherical coefficients are shown in Tables 18A and 18B, and the aberrations are illustrated in Figure 14.

[0531]

[0532]

[0533]

[0534]

[0535] [Example 7]

[0536] The structure and movement trajectory of the zoom optical system of Example 7 are shown in Figure 15. The zoom optical system of Example 7, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, and a third subsequent lens group GR3 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0537] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of a second follower lens group GR2. When focusing from an object at infinity to the nearest object, the second follower lens group GR2 moves towards the object side, while the other lens groups remain fixed relative to the image plane Sim.

[0538] Regarding the zoom optical system of Example 7, the basic lens data is shown in Table 19, the specifications and variable surface spacing are shown in Table 20, the aspherical coefficients are shown in Tables 21A and 21B, and the aberrations are illustrated in Figure 16.

[0539]

[0540]

[0541]

[0542]

[0543] [Example 8]

[0544] The structure and movement trajectory of the zoom optical system of Example 8 are shown in Figure 17. The zoom optical system of Example 8, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, and a fourth subsequent lens group GR4 with positive refractive power.

[0545] During zooming from the wide-angle end to the telephoto end, the fourth subsequent lens group GR4 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes two focusing groups. The object-side focusing group consists of the second subsequent lens group GR2, and the image-side focusing group consists of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the object side, the third subsequent lens group GR3 moves towards the image side, and the other lens groups are fixed relative to the image plane Sim. The image stabilization group consists of the second subsequent lens group GR2.

[0546] Regarding the zoom optical system of Example 8, the basic lens data is shown in Table 22, the specifications and variable surface spacing are shown in Table 23, the aspherical coefficients are shown in Table 24, and the aberrations are illustrated in Figure 18.

[0547]

[0548]

[0549]

[0550] [Example 9]

[0551] The structure and movement trajectory of the zoom optical system of Example 9 are shown in Figure 19. The zoom optical system of Example 9, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with positive refractive power, and a fourth subsequent lens group GR4 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens. The lens constituting the second subsequent lens group GR2 corresponds to the Lrn lens.

[0552] As zooming occurs from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the most image-side conjoined lens of the first subsequent lens group GR1.

[0553] Regarding the zoom optical system of Example 9, the basic lens data is shown in Table 25, the specifications and variable surface spacing are shown in Table 26, the aspherical coefficients are shown in Tables 27A and 27B, and the various aberrations are illustrated in Figure 20.

[0554]

[0555]

[0556]

[0557]

[0558] [Example 10]

[0559] The structure and movement trajectory of the zoom optical system of Example 10 are shown in Figure 21. The zoom optical system of Example 10, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with positive refractive power, and a fourth subsequent lens group GR4 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens. The lens constituting the second subsequent lens group GR2 corresponds to the Lrn lens.

[0560] As zooming occurs from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the most image-side conjoined lens of the first subsequent lens group GR1.

[0561] Regarding the zoom optical system of Example 10, the basic lens data is shown in Table 28, the specifications and variable surface spacing are shown in Table 29, the aspherical coefficients are shown in Tables 30A and 30B, and the various aberrations are illustrated in Figure 22.

[0562]

[0563]

[0564]

[0565]

[0566] [Example 11]

[0567] The structure and movement trajectory of the zoom optical system of Example 11 are shown in Figure 23. The zoom optical system of Example 11, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with positive refractive power, and a fourth subsequent lens group GR4 with negative refractive power. The second lens from the object side of the intermediate group GM corresponds to an Lmn lens. The lens constituting the second subsequent lens group GR2 corresponds to an Lrn lens.

[0568] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1.

[0569] Regarding the zoom optical system of Example 11, the basic lens data is shown in Table 31, the specifications and variable surface spacing are shown in Table 32, the aspherical coefficients are shown in Table 33, and the various aberrations are illustrated in Figure 24.

[0570]

[0571]

[0572]

[0573] [Example 12]

[0574] The structure and movement trajectory of the zoom optical system of Example 12 are shown in Figure 25. The zoom optical system of Example 12, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with negative refractive power, and a fourth subsequent lens group GR4 with positive refractive power.

[0575] The second lens from the object side in the middle group GM corresponds to the Lmn lens.

[0576] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of a second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of a combined lens formed by the second and third lenses from the image side of the first subsequent lens group GR1.

[0577] Regarding the zoom optical system of Example 12, the basic lens data is shown in Table 34, the specifications and variable surface spacing are shown in Table 35, the aspherical coefficients are shown in Table 36, and the various aberrations are illustrated in Figure 26.

[0578]

[0579]

[0580]

[0581] [Example 13]

[0582] The structure and movement trajectory of the zoom optical system of Example 13 are shown in Figure 27. The zoom optical system of Example 13 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side.

[0583] The intermediate group GM consists of a single lens group with negative refractive power. The subsequent groups GR, from the object side to the image side, consist sequentially of the first subsequent lens group GR1 with positive refractive power, the second subsequent lens group GR2 with negative refractive power, the third subsequent lens group GR3 with negative refractive power, and the fourth subsequent lens group GR4 with positive refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0584] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group is composed of the second conjoined lens from the object side of the first subsequent lens group GR1.

[0585] Regarding the zoom optical system of Example 13, the basic lens data is shown in Table 37, the specifications and variable surface spacing are shown in Table 38, the aspherical coefficients are shown in Table 39, and the aberrations are illustrated in Figure 28.

[0586]

[0587]

[0588]

[0589] [Example 14]

[0590] The structure and movement trajectory of the zoom optical system of Example 14 are shown in Figure 29. The zoom optical system of Example 14 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side.

[0591] The intermediate group GM consists of a single lens group with negative refractive power. The subsequent groups GR, from the object side to the image side, consist sequentially of the first subsequent lens group GR1 with positive refractive power, the second subsequent lens group GR2 with negative refractive power, the third subsequent lens group GR3 with negative refractive power, and the fourth subsequent lens group GR4 with positive refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0592] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group is composed of the second conjoined lens from the object side of the first subsequent lens group GR1.

[0593] Regarding the zoom optical system of Example 14, the basic lens data is shown in Table 40, the specifications and variable surface spacing are shown in Table 41, the aspherical coefficients are shown in Table 42, and the various aberrations are illustrated in Figure 30.

[0594]

[0595]

[0596]

[0597] [Example 15]

[0598] The structure and movement trajectory of the zoom optical system of Example 15 are shown in Figure 31. The zoom optical system of Example 15 consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR, arranged sequentially from the object side to the image side.

[0599] The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of the first subsequent lens group GR1 with positive refractive power, the second subsequent lens group GR2 with negative refractive power, the third subsequent lens group GR3 with negative refractive power, and the fourth subsequent lens group GR4 with positive refractive power.

[0600] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the image side of the first subsequent lens group GR1.

[0601] Regarding the zoom optical system of Example 15, the basic lens data is shown in Table 43, the specifications and variable surface spacing are shown in Table 44, the aspherical coefficients are shown in Tables 45A and 45B, and the various aberrations are illustrated in Figure 32.

[0602]

[0603]

[0604]

[0605]

[0606] [Example 16]

[0607] The structure and movement trajectory of the zoom optical system of Example 16 are shown in Figure 33. The zoom optical system of Example 16, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with positive refractive power, a fourth subsequent lens group GR4 with positive refractive power, and a fifth subsequent lens group GR5 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0608] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing with adjacent lens groups. The zoom optical system includes two focusing groups. The object-side focusing group consists of the third subsequent lens group GR3, and the image-side focusing group consists of the fourth subsequent lens group GR4. When focusing from an object at infinity to the nearest object, the third and fourth subsequent lens groups GR3 and GR4 change their spacing and move towards the object side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the second subsequent lens group GR2.

[0609] Regarding the zoom optical system of Example 16, the basic lens data is shown in Table 46, the specifications and variable surface spacing are shown in Table 47, the aspherical coefficients are shown in Table 48, and the aberrations are illustrated in Figure 34.

[0610]

[0611]

[0612]

[0613] [Example 17]

[0614] The structure and movement trajectory of the zoom optical system of Example 17 are shown in Figure 35. The zoom optical system of Example 17, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with positive refractive power, a fourth subsequent lens group GR4 with positive refractive power, and a fifth subsequent lens group GR5 with negative refractive power.

[0615] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the object side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the single lens closest to the object side of the second subsequent lens group GR2.

[0616] Regarding the zoom optical system of Example 17, the basic lens data is shown in Table 49, the specifications and variable surface spacing are shown in Table 50, the aspherical coefficients are shown in Table 51, and the various aberrations are illustrated in Figure 36.

[0617]

[0618]

[0619]

[0620] [Example 18]

[0621] The structure and movement trajectory of the zoom optical system of Example 18 are shown in Figure 37. The zoom optical system of Example 18, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with positive refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with positive refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens. The lens constituting the fourth subsequent lens group GR4 corresponds to the Lrn lens.

[0622] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system includes two focusing groups. The object-side focusing group consists of the third subsequent lens group GR3, and the image-side focusing group consists of the fourth subsequent lens group GR4. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the object side, the fourth subsequent lens group GR4 moves towards the image side, and the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the second subsequent lens group GR2.

[0623] Regarding the zoom optical system of Example 18, the basic lens data is shown in Table 52, the specifications and variable surface spacing are shown in Table 53, the aspherical coefficients are shown in Table 54, and the various aberrations are illustrated in Figure 38.

[0624]

[0625]

[0626]

[0627] [Example 19]

[0628] The structure and movement trajectory of the zoom optical system of Example 19 are shown in Figure 39. The zoom optical system of Example 19, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with positive refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with negative refractive power.

[0629] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the fourth subsequent lens group GR4. When focusing from an object at infinity to the nearest object, the fourth subsequent lens group GR4 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group is composed of the second subsequent lens group GR2.

[0630] Regarding the zoom optical system of Example 19, the basic lens data is shown in Table 55, the specifications and variable surface spacing are shown in Table 56, the aspherical coefficients are shown in Table 57, and the various aberrations are illustrated in Figure 40.

[0631]

[0632]

[0633]

[0634] [Example 20]

[0635] The structure and movement trajectory of the zoom optical system of Example 20 are shown in Figure 41. The zoom optical system of Example 20, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with positive refractive power, and a fifth subsequent lens group GR5 with positive refractive power. The second lens from the object side of the intermediate group GM corresponds to the Lmn lens.

[0636] During zooming from the wide-angle end to the telephoto end, the fifth subsequent lens group GR5 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the most image-side conjoined lens of the first subsequent lens group GR1.

[0637] Regarding the zoom optical system of Example 20, the basic lens data is shown in Table 58, the specifications and variable surface spacing are shown in Table 59, the aspherical coefficients are shown in Table 60, and the aberrations are illustrated in Figure 42.

[0638]

[0639]

[0640]

[0641] [Example 21]

[0642] The structure and movement trajectory of the zoom optical system of Example 21 are shown in Figure 43. The zoom optical system of Example 21, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with positive refractive power, and a fifth subsequent lens group GR5 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0643] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the object in the second subsequent lens group GR2.

[0644] Regarding the zoom optical system of Example 21, the basic lens data is shown in Table 61, the specifications and variable surface spacing are shown in Table 62, the aspherical coefficients are shown in Table 63, and the various aberrations are illustrated in Figure 44.

[0645]

[0646]

[0647]

[0648] [Example 22]

[0649] The structure and movement trajectory of the zoom optical system of Example 22 are shown in Figure 45. The zoom optical system of Example 22, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with positive refractive power. The lens constituting the third subsequent lens group GR3 corresponds to the Lrn lens.

[0650] During zooming from the wide-angle end to the telephoto end, the fifth subsequent lens group GR5 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the most image-side conjoined lens of the first subsequent lens group GR1.

[0651] Regarding the zoom optical system of Example 22, the basic lens data is shown in Table 64, the specifications and variable surface spacing are shown in Table 65, the aspherical coefficients are shown in Table 66, and the aberrations are illustrated in Figure 46.

[0652]

[0653]

[0654]

[0655] [Example 23]

[0656] The structure and movement trajectory of the zoom optical system of Example 23 are shown in Figure 47. The zoom optical system of Example 23, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with positive refractive power. The lens constituting the fourth subsequent lens group GR4 corresponds to the Lrn lens.

[0657] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the object in the second subsequent lens group GR2.

[0658] Regarding the zoom optical system of Example 23, the basic lens data is shown in Table 67, the specifications and variable surface spacing are shown in Table 68, the aspherical coefficients are shown in Table 69, and the aberrations are illustrated in Figure 48.

[0659]

[0660]

[0661]

[0662] [Example 24]

[0663] The structure and movement trajectory of the zoom optical system of Example 24 are shown in Figure 49. The zoom optical system of Example 24, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with positive refractive power. The lens closest to the object side of the intermediate group GM and the second lens from the object side of the intermediate group GM correspond to the Lmn lens, respectively. The lens constituting the fourth subsequent lens group GR4 corresponds to the Lrn lens.

[0664] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group is composed of the second subsequent lens group GR2.

[0665] Regarding the zoom optical system of Example 24, the basic lens data is shown in Table 70, the specifications and variable surface spacing are shown in Table 71, the aspherical coefficients are shown in Table 72, and the aberrations are illustrated in Figure 50.

[0666]

[0667]

[0668]

[0669] [Example 25]

[0670] The structure and movement trajectory of the zoom optical system of Example 25 are shown in Figure 51. The zoom optical system of Example 25, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with positive refractive power, a fourth subsequent lens group GR4 with negative refractive power, and a fifth subsequent lens group GR5 with positive refractive power.

[0671] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the fourth subsequent lens group GR4. When focusing from an object at infinity to the nearest object, the fourth subsequent lens group GR4 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group is composed of the third subsequent lens group GR3.

[0672] Regarding the zoom optical system of Example 25, the basic lens data is shown in Table 73, the specifications and variable surface spacing are shown in Table 74, the aspherical coefficients are shown in Table 75, and the various aberrations are illustrated in Figure 52.

[0673]

[0674]

[0675]

[0676] [Example 26]

[0677] The structure and movement trajectory of the zoom optical system of Example 26 are shown in Figure 53. The zoom optical system of Example 26, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with positive refractive power, a fifth subsequent lens group GR5 with positive refractive power, and a sixth subsequent lens group GR6 with negative refractive power. The lens closest to the object side in the intermediate group GM corresponds to the Lmn lens.

[0678] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system includes two focusing groups. The object-side focusing group consists of the third subsequent lens group GR3, and the image-side focusing group consists of the fourth subsequent lens group GR4. When focusing from an object at infinity to the nearest object, the third subsequent lens group GR3 moves towards the image side, the fourth subsequent lens group GR4 moves towards the object side, and the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the lens closest to the object side of the second subsequent lens group GR2.

[0679] Regarding the zoom optical system of Example 26, the basic lens data is shown in Table 76, the specifications and variable surface spacing are shown in Table 77, the aspherical coefficients are shown in Table 78, and the aberrations are illustrated in Figure 54.

[0680]

[0681]

[0682]

[0683] [Example 27]

[0684] The structure and movement trajectory of the zoom optical system of Example 27 are shown in Figure 55. The zoom optical system of Example 27, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate group GM, and a subsequent group GR. The intermediate group GM consists of a single lens group with negative refractive power. The subsequent group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, a fourth subsequent lens group GR4 with positive refractive power, a fifth subsequent lens group GR5 with negative refractive power, and a sixth subsequent lens group GR6 with positive refractive power.

[0685] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the fifth subsequent lens group GR5. When focusing from an object at infinity to the nearest object, the fifth subsequent lens group GR5 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim.

[0686] Regarding the zoom optical system of Example 27, the basic lens data is shown in Table 79, the specifications and variable surface spacing are shown in Table 80, the aspherical coefficients are shown in Table 81, and the various aberrations are illustrated in Figure 56.

[0687]

[0688]

[0689]

[0690] [Example 28]

[0691] The structure and movement trajectory of the zoom optical system of Example 28 are shown in Figure 57. The zoom optical system of Example 28, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR. The intermediate lens group GM, from the object side to the image side, consists of two lens groups: a first intermediate lens group GM1 with negative refractive power and a second intermediate lens group GM2 with negative refractive power. The subsequent lens group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, and a third subsequent lens group GR3 with negative refractive power. The second lens from the object side of the first intermediate lens group GM1 corresponds to the Lmn lens. The lens closest to the image side of the second subsequent lens group GR2 corresponds to the Lrn lens.

[0692] During zooming from the wide-angle end to the telephoto end, the third subsequent lens group GR3 is fixed relative to the image plane Sim, while the other lens groups move along the optical axis Z by changing the spacing between adjacent lens groups.

[0693] The zoom optical system consists of only one focusing group. This focusing group comprises a second follower lens group, GR2. When focusing from an object at infinity to the nearest object, the second follower lens group, GR2, moves towards the image side, while the other lens groups remain fixed relative to the image plane, Sim. The image stabilization group consists of the single lens closest to the image side of the first follower lens group, GR1.

[0694] Regarding the zoom optical system of Example 28, the basic lens data is shown in Table 82, the specifications and variable surface spacing are shown in Table 83, the aspherical coefficients are shown in Tables 84A and 84B, and the various aberrations are illustrated in Figure 58.

[0695]

[0696]

[0697]

[0698]

[0699] [Example 29]

[0700] The structure and movement trajectory of the zoom optical system of Example 29 are shown in Figure 59. The zoom optical system of Example 29, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR. The intermediate lens group GM, from the object side to the image side, consists of two lens groups: a first intermediate lens group GM1 with negative refractive power and a second intermediate lens group GM2 with negative refractive power. The subsequent lens group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with negative refractive power, a third subsequent lens group GR3 with negative refractive power, and a fourth subsequent lens group GR4 with positive refractive power. The second lens from the object side of the first intermediate lens group GM1 corresponds to the Lmn lens.

[0701] During zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system includes only one focusing group. The focusing group consists of a second subsequent lens group GR2. When focusing from an object at infinity to the nearest object, the second subsequent lens group GR2 moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of a combined lens formed by the second and third lenses from the image side of the first subsequent lens group GR1.

[0702] Regarding the zoom optical system of Example 29, the basic lens data is shown in Table 85, the specifications and variable surface spacing are shown in Table 86, the aspherical coefficients are shown in Table 87, and the aberrations are illustrated in Figure 60.

[0703]

[0704]

[0705]

[0706] [Example 30]

[0707] The structure and movement trajectory of the zoom optical system of Example 30 are shown in Figure 61. The zoom optical system of Example 30, from the object side to the image side, consists of a first lens group G1 with positive refractive power, an intermediate lens group GM, and a subsequent lens group GR. The intermediate lens group GM, from the object side to the image side, consists of two lens groups: a first intermediate lens group GM1 with negative refractive power and a second intermediate lens group GM2 with negative refractive power. The subsequent lens group GR, from the object side to the image side, consists of a first subsequent lens group GR1 with positive refractive power, a second subsequent lens group GR2 with positive refractive power, a third subsequent lens group GR3 with negative refractive power, and a fourth subsequent lens group GR4 with positive refractive power. The lens closest to the object side in the first intermediate lens group GM1 corresponds to the Lmn lens.

[0708] As zooming from the wide-angle end to the telephoto end, all lens groups move by changing their spacing from adjacent lens groups. The zoom optical system consists of only one focusing group. The focusing group is composed of the third subsequent lens group GR3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side, while the other lens groups remain fixed relative to the image plane Sim. The image stabilization group consists of the single lens closest to the object in the second subsequent lens group GR2.

[0709] Regarding the zoom optical system of Example 30, the basic lens data is shown in Table 88, the specifications and variable surface spacing are shown in Table 89, the aspherical coefficients are shown in Table 90, and the various aberrations are illustrated in Figure 62.

[0710]

[0711]

[0712]

[0713] The corresponding values ​​of conditional expressions (1) to (38) for the zoom optical systems of Examples 1 to 30 are shown in Tables 91 to 102. The corresponding values ​​of the examples shown in Tables 91 to 102 can be used as the upper or lower limits of the conditional expressions to set the preferred range of the conditional expressions.

[0714]

[0715]

[0716]

[0717]

[0718]

[0719]

[0720]

[0721]

[0722]

[0723]

[0724]

[0725]

[0726] Although the zoom optical systems of Examples 1-30 are small in size, their aberrations are well corrected throughout the zoom range, thus maintaining high optical performance.

[0727] Next, the imaging device according to an embodiment of the present invention will be described. Figures 63 and 64 show external views of a camera 30 as an embodiment of the imaging device according to the present invention. Figure 63 shows a perspective view of the camera 30 viewed from the front side, and Figure 64 shows a perspective view of the camera 30 viewed from the rear side. The camera 30 is a so-called mirrorless digital camera, which allows for the detachable mounting of an interchangeable lens 20. The interchangeable lens 20 is configured to include a zoom optical system 1 according to an embodiment of the present invention housed within a lens barrel.

[0728] The camera 30 includes a camera body 31. A shutter button 32 and a power button 33 are provided on the upper surface of the camera body 31. Furthermore, an operation unit 34, an operation unit 35, and a display unit 36 ​​are provided on the back of the camera body 31. The display unit 36 ​​can display the captured image and the image present in the field of view before shooting.

[0729] A photographic opening for light from the subject is provided at the center of the front surface of the camera body 31. A bayonet 37 is provided at a position corresponding to the photographic opening, through which the interchangeable lens 20 is mounted on the camera body 31.

[0730] An image sensor 38 is disposed within the camera body 31. The image sensor 38 outputs an image signal corresponding to the image of the subject formed by the interchangeable lens 20. The image sensor 38 may be, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). A signal processing circuit (not shown) and a recording medium (not shown) are disposed within the camera body 31. The signal processing circuit processes the image signal output from the image sensor 38 to generate an image. The recording medium is used to record the generated image. In the camera 30, still images or moving images can be captured by pressing the shutter button 32, and the image data obtained by this capture is recorded in the aforementioned recording medium.

[0731] The above description, through examples and embodiments, illustrates the technology of the present invention. However, the technology of the present invention is not limited to the above examples and embodiments, and various modifications are possible. For example, the radius of curvature, interplanar spacing, refractive index, Abbe number, and aspherical coefficient of each lens are not limited to the values ​​shown in the above embodiments, and can take other values.

[0732] Furthermore, the camera device involved in the embodiments of the present invention is not limited to the above examples, and can be configured in various ways, such as a camera other than a mirrorless camera, a film camera, a video camera, and a security camera.

[0733] The following notes further disclose the above implementation methods and embodiments.

[0734] [Postscript 1]

[0735] A zoom optical system comprises, from the object side to the image side, a first lens group with positive refractive power, an intermediate group consisting of two or fewer lens groups with negative refractive power, and a subsequent group consisting of multiple lens groups.

[0736] The lens group closest to the object in the subsequent group has positive refractive power.

[0737] During zooming, the first lens group moves, and the spacing between all adjacent lens groups changes.

[0738] When focusing on an object at infinity at the wide-angle end, the sum of the distance along the optical axis from the lens surface closest to the object in the first lens group to the lens surface closest to the image in the subsequent lens group, and the back focal length of the entire system in air-converted distance is denoted as TLw.

[0739] The focal length of the entire system when focusing on an object at infinity at the telephoto end is set to ft.

[0740] The maximum half-angle of focusing on an object at infinity at the telephoto end is set as ωt.

[0741] The back focal length of the entire system's air-equivalent distance meter, when focused on an object at infinity at the wide-angle end, is set to Bfw.

[0742] The focal length of the entire system, when focused on an object at infinity at the wide-angle end, is set to fw, and...

[0743] When the open F-value is set to FNow while focusing on an object at infinity at the wide-angle end,

[0744] The zoom optical system satisfies the following conditions (1), (2) and (3):

[0745] 2.9<TLw / (ft×tanωt)<7 (1)

[0746] 0.4<Bfw / (ft×tanωt)<1.5 (2)

[0747] 0.05 < (fw × TLw) / (ft) 2 ×FNow)<0.23 (3)。

[0748] [Postscript 2]

[0749] According to the zoom optical system described in Appendix 1, it satisfies the condition (1-1) expressed by the following equation:

[0750] 3.5<TLw / (ft×tanωt)<6 (1-1).

[0751] [Postscript 3]

[0752] According to Appendix 1 or 2, the zoom optical system satisfies the condition (3-1) expressed by the following formula:

[0753] 0.08 < (fw × TLw) / (ft) 2 ×FNow) < 0.165 (3-1).

[0754] [Postscript 4]

[0755] According to Appendix 3, the zoom optical system satisfies the condition (3-2) expressed by the following equation:

[0756] 0.1 < (fw × TLw) / (ft) 2 ×FNow)<0.16 (3-2)。

[0757] [Postscript 5]

[0758] According to any one of Appendices 1 to 4, the zoom optical system wherein...

[0759] When the maximum half-angle view is set to ωw when focusing on an object at infinity at the wide-angle end,

[0760] The zoom optical system satisfies condition (4) expressed by the following equation:

[0761] 0.15<tanωw / FNow<0.5 (4).

[0762] [Postscript 6]

[0763] According to the zoom optical system described in Appendix 5, it satisfies the condition (4-1) expressed by the following equation:

[0764] 0.21<tanωw / FNow<0.35 (4-1).

[0765] [Postscript 7]

[0766] According to any one of the appendices 1 to 6, the zoom optical system satisfies the condition (5) expressed by the following formula:

[0767] 0.65<FNow / (ft / fw)<1.6 (5).

[0768] [Postscript 8]

[0769] According to the zoom optical system described in Appendix 7, it satisfies the condition (5-1) expressed by the following equation:

[0770] 0.85<FNow / (ft / fw)<1.28 (5-1).

[0771] [Postscript 9]

[0772] According to any one of Appendices 1 to 8, the zoom optical system wherein,

[0773] When the focal length of the first lens group is set to f1...

[0774] The zoom optical system satisfies the condition (6) expressed by the following equation:

[0775] 0.02 < fw / f1 < 0.3 (6).

[0776] [Postscript 10]

[0777] According to Appendix 9, the zoom optical system satisfies the condition (6-1) expressed by the following equation:

[0778] 0.048<fw / f1<0.14 (6-1).

[0779] [Postscript 11]

[0780] According to Appendix 9, the zoom optical system satisfies the condition (6-2) expressed by the following equation:

[0781] 0.05<fw / f1<0.13 (6-2).

[0782] [Postscript 12]

[0783] According to any one of Appendices 1 to 11, the zoom optical system wherein,

[0784] When the focal length of the first lens group is set to f1, and...

[0785] When the focal length of the intermediate group is set to fMw in a state where the focus is on an object at infinity at the wide-angle end,

[0786] The zoom optical system satisfies the condition (7) expressed by the following equation:

[0787] 4.5<f1 / (-fMw)<14 (7).

[0788] [Postscript 13]

[0789] According to the zoom optical system described in Appendix 12, it satisfies the condition (7-1) expressed by the following equation:

[0790] 5.7<f1 / (-fMw)<8.7 (7-1).

[0791] [Postscript 14]

[0792] According to any one of Appendices 1 to 13, the zoom optical system wherein...

[0793] When the focal length of the intermediate group is set to fMw, with the wide-angle end focused on an object at infinity,

[0794] The zoom optical system satisfies the condition (8) expressed by the following equation:

[0795] 0.3 < (-fMw) / (fw × ft) 1 / 2 <1.4 (8).

[0796] [Postscript 15]

[0797] According to the zoom optical system described in Appendix 14, it satisfies the condition (8-1) expressed by the following equation:

[0798] 0.6 < (-fMw) / (fw × ft) 1 / 2 <0.9 (8-1).

[0799] [Postscript 16]

[0800] According to any one of Appendices 1 to 15, the zoom optical system wherein...

[0801] When the focal length of the first lens group is set to f1, and...

[0802] When the open F-value is set to FNot while focusing on an object at infinity at the telephoto end,

[0803] The zoom optical system satisfies the condition (9) expressed by the following equation:

[0804] 5<f1 / (ft / FNot)<20 (9).

[0805] [Postscript 17]

[0806] According to Appendix 16, the zoom optical system satisfies the condition (9-1) expressed by the following equation:

[0807] 7<f1 / (ft / FNot)<11 (9-1).

[0808] [Postscript 18]

[0809] The zoom optical system according to any one of Appendix 1 to 17 satisfies the condition (10) expressed by the following formula:

[0810] 2.5 < TLw / fw < 8 (10).

[0811] [Postscript 19]

[0812] According to Appendix 18, the zoom optical system satisfies the condition (10-1) expressed by the following equation:

[0813] 3.5<TLw / fw<6 (10-1).

[0814] [Postscript 20]

[0815] According to any one of Appendices 1 to 19, the zoom optical system wherein...

[0816] The first lens group includes a negative lens and a positive lens.

[0817] [Postscript 21]

[0818] According to any one of Appendices 1 to 20, in the zoom optical system, wherein,

[0819] The intermediate group includes three negative lenses.

[0820] [Postscript 22]

[0821] According to any one of Appendices 1 to 21, the zoom optical system wherein,

[0822] The intermediate group includes Lmn lenses with negative refractive power.

[0823] The object-side surface of the Lmn lens is an aspherical surface, and the refractive power of the aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared with the refractive power in the paraxial region.

[0824] [Postscript 23]

[0825] According to the zoom optical system described in Appendix 22, wherein,

[0826] The object-side surface of the Lmn lens is concave in the paraxial region and convex in the periphery, including the position of the maximum effective diameter.

[0827] [Postscript 24]

[0828] According to any one of Appendices 1 to 23, the zoom optical system wherein...

[0829] When focusing on an object at infinity at the telephoto end, the open F-number is set to Fnot, and...

[0830] When focusing on an object at infinity at the telephoto end, the sum of the distance along the optical axis from the lens surface of the first lens group closest to the object to the lens surface of the subsequent lens group closest to the image, and the back focal length of the entire system in terms of air-converted distance, is denoted as TLt.

[0831] The zoom optical system satisfies condition (11) expressed by the following equation:

[0832] 8<FNot×(TLt / ft)<17 (11).

[0833] [Postscript 25]

[0834] According to any one of Appendices 1 to 24, the zoom optical system wherein...

[0835] When the focal length of the first lens group is set to f1, and...

[0836] When the focal length of the lens group closest to the object in the subsequent group is set to fR1...

[0837] The zoom optical system satisfies the condition (12) expressed by the following formula: 1.5 < f1 / fR1 < 17 (12).

[0838] [Postscript 26]

[0839] The zoom optical system according to any one of Appendix 1 to 25 satisfies the condition (13) expressed by the following formula:

[0840] 1.2<TLw / ft<2.2 (13).

[0841] [Postscript 27]

[0842] According to any one of the appendices 1 to 26, the zoom optical system satisfies the condition (14) expressed by the following formula:

[0843] 2.8 < ft / fw < 4 (14).

[0844] [Postscript 28]

[0845] According to any one of Appendices 1 to 27, the zoom optical system wherein...

[0846] When the focal length of the first lens group is set to f1...

[0847] The zoom optical system satisfies the condition (15) expressed by the following equation:

[0848] 3 < f1 / (fw×ft) 1 / 2 <9 (15).

[0849] [Postscript 29]

[0850] According to any one of Appendices 1 to 28, the zoom optical system wherein,

[0851] When the telephoto lens is focused on an object at infinity, the sum of the distance along the optical axis from the lens surface closest to the object in the first lens group to the lens surface closest to the image in the subsequent lens group, and the back focal length of the entire system in terms of air-converted distance, is denoted as TLt.

[0852] The zoom optical system satisfies the condition (16) expressed by the following equation:

[0853] 1.25<TLt / TLw<1.6 (16).

[0854] [Postscript 30]

[0855] According to any one of Appendices 1 to 29, the zoom optical system wherein...

[0856] When the focal length of the subsequent group is set to fRw, with the wide-angle end focused on an object at infinity,

[0857] The zoom optical system satisfies the condition (17) expressed by the following equation:

[0858] 0.3<fw / fRw<1.2 (17).

[0859] [Postscript 31]

[0860] According to any one of Annexes 1 to 30, in the zoom optical system, wherein...

[0861] When the focal length of the subsequent group is set to fRt, with the telephoto end focused on an object at infinity,

[0862] The zoom optical system satisfies the condition (18) expressed by the following formula: 0.6 < ft / fRt < 5 (18).

[0863] [Postscript 32]

[0864] According to any one of Appendices 1 to 31, the zoom optical system wherein...

[0865] When the focal length of the lens group closest to the object in the subsequent group is set to fR1.

[0866] The zoom optical system satisfies the condition (19) expressed by the following equation: 0.05 < fR1 / (fw×ft). 1 / 2 <3 (19).

[0867] [Postscript 33]

[0868] According to any one of Appendices 1 to 32, the zoom optical system wherein...

[0869] When the focal length of the lens group closest to the object in the subsequent group is set to fR1.

[0870] The zoom optical system satisfies the condition (20) expressed by the following equation:

[0871] 0.15 < fw / fR1 < 2 (20).

[0872] [Postscript 34]

[0873] According to any one of Annexes 1 to 33, the zoom optical system wherein...

[0874] The subsequent group is equipped with an anti-vibration group that moves in a direction intersecting the optical axis when correcting image jitter, and

[0875] When the focal length of the vibration damping group is set to fIS...

[0876] The zoom optical system satisfies the condition (21) expressed by the following equation:

[0877] 0.2<|fIS / ft|<2 (21).

[0878] [Postscript 35]

[0879] According to any one of Appendices 1 to 34, the zoom optical system wherein...

[0880] The subsequent group is configured with at least one focusing group that moves along the optical axis during focusing.

[0881] When the focal length of at least one of the focus groups is set to ff

[0882] The zoom optical system satisfies the condition (22) expressed by the following equation:

[0883] 0.2<|ff / ft|<1.4 (22).

[0884] [Postscript 36]

[0885] According to any one of Appendices 1 to 35, the zoom optical system wherein...

[0886] The subsequent group includes an Lrn lens with negative refractive power.

[0887] The image-side surface of the Lrn lens is an aspherical surface, and the refractive power of the aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared with the refractive power in the paraxial region.

[0888] [Postscript 37]

[0889] According to the zoom optical system described in Appendix 36, wherein...

[0890] The image-side surface of the Lrn lens is concave in the paraxial region and convex in the periphery, including the position of the maximum effective diameter.

[0891] [Postscript 38]

[0892] According to any one of Annexes 1 to 37, the zoom optical system wherein...

[0893] The focusing group that moves along the optical axis during focusing is only configured in the subsequent group.

[0894] [Postscript 39]

[0895] According to the zoom optical system described in Appendix 38, wherein...

[0896] The two focus groups, which move by changing their mutual spacing during focusing, are configured in the subsequent group.

[0897] [Postscript 40]

[0898] According to any one of Appendices 1 to 39, the zoom optical system wherein...

[0899] The first lens group includes a joint lens, which is sequentially joined from the object side with a negative meniscus lens with its convex surface facing the object side and a positive lens with its convex surface facing the object side.

[0900] When the refractive index of the negative meniscus lens relative to the d-line is set to Ndn, and...

[0901] When the Abbe number of the d-line reference of the negative meniscus lens is set to νdn.

[0902] The zoom optical system satisfies the condition (23) expressed by the following equation:

[0903] 1.94<Ndn+0.01×νdn<2.5 (23).

[0904] [Postscript 41]

[0905] According to the zoom optical system described in Appendix 40, wherein...

[0906] When the refractive index of the positive lens with its convex surface facing the object is set to Ndp relative to the d-line, and...

[0907] When the Abbe number of the d-line reference of the positive lens with its convex surface facing the object is set to νdp...

[0908] The zoom optical system satisfies the condition (24) expressed by the following equation:

[0909] 2<Ndp+0.01×νdp<2.6 (24).

[0910] [Postscript 42]

[0911] According to any one of Appendices 1 to 41, the zoom optical system wherein...

[0912] When the average Abbe number of the d-line reference of all positive lenses in the first lens group is set to νd1p_ave,

[0913] The zoom optical system satisfies the condition (25) expressed by the following equation:

[0914] 40<νd1p_ave<85 (25).

[0915] [Postscript 43]

[0916] According to any one of Appendices 1 to 42, in the zoom optical system, wherein,

[0917] Let the sum of the thicknesses along the optical axis of all lenses in the first lens group be d1sum, and...

[0918] When the focal length of the first lens group is set to f1...

[0919] The zoom optical system satisfies the condition (26) expressed by the following equation:

[0920] 0.01<d1sum / f1<0.2 (26).

[0921] [Postscript 44]

[0922] According to any one of Annexes 1 to 43, in the zoom optical system, wherein...

[0923] The intermediate group consists of two lens groups with negative refractive power.

[0924] When the focal length of the lens group closest to the object in the middle group is set to fM1, and...

[0925] When the focal length of the lens group closest to the image side of the intermediate group is set to fM2...

[0926] The zoom optical system satisfies the condition (27) expressed by the following equation:

[0927] 0.01<fM1 / fM2<1.6 (27).

[0928] [Postscript 45]

[0929] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[0930] The subsequent lens group consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group, arranged sequentially from the object side to the image side.

[0931] [Postscript 46]

[0932] According to the zoom optical system described in Appendix 45, wherein...

[0933] When the focal length of the first subsequent lens group is set to fR1, and...

[0934] When the focal length of the second subsequent lens group is set to fR2...

[0935] The zoom optical system satisfies the condition (28) expressed by the following equation:

[0936] 0.2<fR1 / (-fR2)<2 (28).

[0937] [Postscript 47]

[0938] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[0939] The subsequent lens group consists of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, and a third subsequent lens group with negative refractive power.

[0940] [Postscript 48]

[0941] According to the zoom optical system described in Appendix 47, wherein...

[0942] When the focal length of the second subsequent lens group is set to fR2, and

[0943] When the focal length of the third subsequent lens group is set to fR3.

[0944] The zoom optical system satisfies the condition (29) expressed by the following equation:

[0945] 0.4<fR2 / (-fR3)<3.7 (29).

[0946] [Postscript 49]

[0947] According to the zoom optical system described in Appendix 47 or 48, wherein...

[0948] When the focal length of the first subsequent lens group is set to fR1, and...

[0949] When the focal length of the second subsequent lens group is set to fR2...

[0950] The zoom optical system satisfies the condition (30) expressed by the following equation:

[0951] 0.3 < fR1 / fR2 < 4 (30).

[0952] [Postscript 50]

[0953] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[0954] The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, a third subsequent lens group with positive refractive power, and a fourth subsequent lens group with negative refractive power.

[0955] [Postscript 51]

[0956] According to the zoom optical system described in Appendix 50, wherein,

[0957] When the focal length of the first subsequent lens group is set to fR1, and...

[0958] When the focal length of the second subsequent lens group is set to fR2...

[0959] The zoom optical system satisfies the condition (28A) expressed by the following equation:

[0960] 0.2<fR1 / (-fR2)<1.5 (28A).

[0961] [Postscript 52]

[0962] According to the zoom optical system described in appendix 50 or 51, wherein,

[0963] When the focal length of the second subsequent lens group is set to fR2, and

[0964] When the focal length of the third subsequent lens group is set to fR3.

[0965] The zoom optical system satisfies the condition (31) expressed by the following equation:

[0966] 0.3<(-fR2) / fR3<2.4 (31).

[0967] [Postscript 53]

[0968] According to any one of Appendices 50 to 52, the zoom optical system wherein,

[0969] When the focal length of the first subsequent lens group is set to fR1, and...

[0970] When the focal length of the third subsequent lens group is set to fR3.

[0971] The zoom optical system satisfies the condition (32) expressed by the following equation:

[0972] 0.1<fR1 / fR3<1.4 (32).

[0973] [Postscript 54]

[0974] According to any one of Appendices 50 to 53, the zoom optical system wherein...

[0975] When the focal length of the second subsequent lens group is set to fR2, and

[0976] When the focal length of the fourth subsequent lens group is set to fR4...

[0977] The zoom optical system satisfies the condition (33) expressed by the following equation:

[0978] 0.15<(-fR2) / (-fR4)<1.8 (33).

[0979] [Postscript 55]

[0980] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[0981] The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, and a fourth subsequent lens group with positive refractive power.

[0982] [Postscript 56]

[0983] According to the zoom optical system described in Appendix 55, wherein...

[0984] When the focal length of the first subsequent lens group is set to fR1, and...

[0985] When the focal length of the third subsequent lens group is set to fR3.

[0986] The zoom optical system satisfies the condition (34) expressed by the following equation:

[0987] 0.4<fR1 / (-fR3)<2.5 (34).

[0988] [Postscript 57]

[0989] According to the zoom optical system described in Appendix 55 or 56, wherein...

[0990] When the focal length of the second subsequent lens group is set to fR2, and

[0991] When the focal length of the third subsequent lens group is set to fR3.

[0992] The zoom optical system satisfies the condition (29A) expressed by the following equation:

[0993] 0.3<fR2 / (-fR3)<3.5 (29A).

[0994] [Postscript 58]

[0995] According to any one of Appendices 55 to 57, the zoom optical system wherein...

[0996] When the focal length of the first subsequent lens group is set to fR1, and...

[0997] When the focal length of the second subsequent lens group is set to fR2...

[0998] The zoom optical system satisfies the condition (30A) expressed by the following equation:

[0999] 0.3<fR1 / fR2<5 (30A).

[1000] [Postscript 59]

[1001] According to any one of Appendices 55 to 58, the zoom optical system wherein...

[1002] When the focal length of the second subsequent lens group is set to fR2, and

[1003] When the focal length of the fourth subsequent lens group is set to fR4...

[1004] The zoom optical system satisfies the condition (35) expressed by the following equation:

[1005] 0.1 < fR2 / fR4 < 2 (35).

[1006] [Postscript 60]

[1007] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[1008] The subsequent lens group consists of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with positive refractive power, a fourth subsequent lens group, and a fifth subsequent lens group.

[1009] [Postscript 61]

[1010] According to the zoom optical system described in Appendix 60, wherein,

[1011] When the focal length of the first subsequent lens group is set to fR1, and...

[1012] When the focal length of the second subsequent lens group is set to fR2...

[1013] The zoom optical system satisfies the condition (30B) expressed by the following equation:

[1014] 0.1<fR1 / fR2<4.5 (30B).

[1015] [Postscript 62]

[1016] According to the zoom optical system described in appendix 60 or 61, wherein,

[1017] When the focal length of the second subsequent lens group is set to fR2, and

[1018] When the focal length of the third subsequent lens group is set to fR3.

[1019] The zoom optical system satisfies the condition (36) expressed by the following equation:

[1020] 0.2 < fR2 / fR3 < 3 (36).

[1021] [Postscript 63]

[1022] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[1023] The subsequent lens group consists of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, a fourth subsequent lens group with negative refractive power, and a fifth subsequent lens group with positive refractive power.

[1024] [Postscript 64]

[1025] According to the zoom optical system described in Appendix 63, wherein...

[1026] When the focal length of the first subsequent lens group is set to fR1, and...

[1027] When the focal length of the second subsequent lens group is set to fR2...

[1028] The zoom optical system satisfies the condition (30C) expressed by the following equation:

[1029] 0.2<fR1 / fR2<4 (30C).

[1030] [Postscript 65]

[1031] According to the zoom optical system described in Appendix 63 or 64, wherein...

[1032] When the focal length of the third subsequent lens group is set to fR3, and

[1033] When the focal length of the fourth subsequent lens group is set to fR4...

[1034] The zoom optical system satisfies the condition (37) expressed by the following equation:

[1035] 0.01<fR3 / fR4<4 (37).

[1036] [Postscript 66]

[1037] According to any one of Annexes 1 to 44, in the zoom optical system, wherein...

[1038] The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group with negative refractive power.

[1039] [Postscript 67]

[1040] According to the zoom optical system described in Appendix 66, wherein...

[1041] When the focal length of the first subsequent lens group is set to fR1, and...

[1042] When the focal length of the second subsequent lens group is set to fR2...

[1043] The zoom optical system satisfies the condition (28B) expressed by the following equation:

[1044] 0.2<fR1 / (-fR2)<1.8 (28B).

[1045] [Postscript 68]

[1046] According to the zoom optical system described in Appendix 66 or 67, wherein...

[1047] When the focal length of the second subsequent lens group is set to fR2, and

[1048] When the focal length of the third subsequent lens group is set to fR3.

[1049] The zoom optical system satisfies the condition (38) expressed by the following equation:

[1050] 0.05<(-fR2) / (-fR3)<1.2 (38).

[1051] [Postscript 69]

[1052] A camera device comprising a zoom optical system as described in any one of Appendices 1 to 68.

[1053] All documents, patent applications and technical standards described in this specification are incorporated herein by reference, as are the individual documents, patent applications and technical standards specifically described and incorporated by reference.

Claims

1. A zoom optical system comprising, from the object side to the image side, a first lens group having positive refractive power, an intermediate group consisting of two or fewer lens groups having negative refractive power, and a subsequent group consisting of multiple lens groups. The lens group closest to the object side of the subsequent group has positive refractive power. During zooming, the first lens group moves, and the spacing between all adjacent lens groups changes. The sum of the distance along the optical axis from the lens surface closest to the object side of the first lens group to the lens surface closest to the image side of the subsequent group, when the image is focused at a wide-angle end on an object at infinity, and the back focal length of the entire system (measured in air), is denoted as TLw. When the focal length of the entire system is set to ft when focusing on an object at infinity at the focal end, the maximum half angle of view is set to ωt when focusing on an object at infinity at the telephoto end, the back focal length of the entire system in terms of air-to-ground distance is set to Bfw when focusing on an object at infinity at the wide-angle end, the focal length of the entire system is set to fw when focusing on an object at infinity at the wide-angle end, and the open F-value is set to FNow when focusing on an object at infinity at the wide-angle end, the zoom optical system satisfies the following conditions (1), (2) and (3): 2.9 < TLw / (ft × tanωt) < 7 (1) 0.4 < Bfw / (ft × tanωt) < 1.5 (2) 0.05 < (fw × TLw) / (ft 2 ×FNow)<0.23 (3)。 2. The zoom optical system according to claim 1, which satisfies the condition (3-1) expressed by the following formula: 0.08 < (fw × TLw) / (ft) 2 ×FNow) < 0.165 (3-1).

3. The zoom optical system according to claim 2, which satisfies the condition (3-2) expressed by the following formula: 0.1 < (fw × TLw) / (ft) 2 ×FNow)<0.16 (3-2)。 4. The zoom optical system according to claim 1, wherein, When the maximum half angle of view is set to ωw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (4) expressed by the following formula: 0.15<tanωw / FNow<0.5 (4).

5. The zoom optical system according to claim 1, which satisfies the condition (5) expressed by the following formula: 0.65 < FNow / (ft / fw) < 1.6 (5).

6. The zoom optical system according to claim 1, wherein, When the focal length of the first lens group is set to f1, the zoom optical system satisfies the condition (6) expressed by the following formula: 0.02 < fw / f1 < 0.3 (6).

7. The zoom optical system according to claim 1, wherein, When the focal length of the first lens group is set to f1 and the focal length of the intermediate group is set to fMw when the object is focused at infinity at the wide-angle end, the zoom optical system satisfies the condition (7) expressed by the following formula: 4.5 < f1 / (-fMw) < 14 (7).

8. The zoom optical system according to claim 1, wherein, When the focal length of the intermediate group is set to fMw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (8) expressed by the following formula: 0.3 < (-fMw) / (fw × ft) 1 / 2 <1.4 (8).

9. The zoom optical system according to claim 1, wherein, When the focal length of the first lens group is set to f1 and the open F value is set to FNot when focusing on an object at infinity at the telephoto end, the zoom optical system satisfies the condition (9) expressed by the following formula: 5 < f1 / (ft / FNot) < 20 (9).

10. The zoom optical system according to claim 1, which satisfies the condition (10) expressed by the following formula: 2.5 < TLw / fw < 8 (10).

11. The zoom optical system according to claim 2, which satisfies the condition (1-1) expressed by the following formula: 3.5 < TLw / (ft×tanωt) < 6 (1-1).

12. The zoom optical system according to claim 11, wherein, When the maximum half angle of view is set to ωw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (4-1) expressed by the following formula: 0.21<tanωw / FNow<0.35 (4-1).

13. The zoom optical system according to claim 12, which satisfies the condition (5-1) expressed by the following formula: 0.85 < FNow / (ft / fw) < 1.28 (5-1).

14. The zoom optical system according to claim 13, wherein, When the focal length of the first lens group is set to f1, the zoom optical system satisfies the condition (6-2) expressed by the following formula: 0.05 < fw / f1 < 0.13 (6-2).

15. The zoom optical system according to claim 14, wherein, When the focal length of the intermediate group is set to fMw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (7-1) expressed by the following formula: 5.7 < f1 / (-fMw) < 8.7 (7-1).

16. The zoom optical system according to claim 15, wherein, The first lens group includes a negative lens and a positive lens.

17. The zoom optical system according to claim 15, wherein, The intermediate group includes three negative lenses.

18. The zoom optical system according to claim 14, wherein, The intermediate group includes an Lmn lens with negative refractive power. The object-side surface of the Lmn lens is aspherical, and the refractive power of the aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared with the refractive power in the paraxial region.

19. The zoom optical system according to claim 18, wherein, The object-side surface of the Lmn lens is concave in the paraxial region and convex in the periphery, including the position of the maximum effective diameter.

20. The zoom optical system according to claim 15, which satisfies the condition (10-1) expressed by the following formula: 3.5 < TLw / fw < 6 (10-1).

21. The zoom optical system according to claim 15, wherein, When the focal length of the intermediate group is set to fMw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (8-1) expressed by the following formula: 0.6 < (-fMw) / (fw × ft). 1 / 2 <0.9 (8-1).

22. The zoom optical system according to claim 15, wherein, When the open F-value is set to FNot when the telephoto end is focused on an object at infinity, the zoom optical system satisfies the condition (9-1) expressed by the following formula: 7 < f1 / (ft / FNot) < 11 (9-1).

23. The zoom optical system according to claim 3, which satisfies the condition (1-1) expressed by the following formula: 3.5 < TLw / (ft×tanωt) < 6 (1-1).

24. The zoom optical system according to claim 23, wherein, When the maximum half angle of view is set to ωw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (4-1) expressed by the following formula: 0.21<tanωw / FNow<0.35 (4-1).

25. The zoom optical system according to claim 24, which satisfies the condition (5-1) expressed by the following formula: 0.85 < FNow / (ft / fw) < 1.28 (5-1).

26. The zoom optical system according to claim 25, wherein, When the focal length of the first lens group is set to f1, the zoom optical system satisfies the condition (6-1) expressed by the following formula: 0.048 < fw / f1 < 0.14 (6-1).

27. The zoom optical system according to claim 26, wherein, When the focal length of the intermediate group is set to fMw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (7-1) expressed by the following formula: 5.7 < f1 / (-fMw) < 8.7 (7-1).

28. The zoom optical system according to claim 27, wherein, The first lens group includes a negative lens and a positive lens.

29. The zoom optical system according to claim 27, wherein, The intermediate group includes three negative lenses.

30. The zoom optical system according to claim 26, wherein, The intermediate group includes an Lmn lens with negative refractive power. The object-side surface of the Lmn lens is aspherical, and the refractive power of the aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared with the refractive power in the paraxial region.

31. The zoom optical system according to claim 30, wherein, The object-side surface of the Lmn lens is concave in the paraxial region and convex in the periphery, including the position of the maximum effective diameter.

32. The zoom optical system according to claim 27, which satisfies the condition (10-1) expressed by the following formula: 3.5 < TLw / fw < 6 (10-1).

33. The zoom optical system according to claim 27, wherein, When the focal length of the intermediate group is set to fMw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (8-1) expressed by the following formula: 0.6 < (-fMw) / (fw × ft). 1 / 2 <0.9 (8-1).

34. The zoom optical system according to claim 27, wherein, When the open F-value is set to FNot when the telephoto end is focused on an object at infinity, the zoom optical system satisfies the condition (9-1) expressed by the following formula: 7 < f1 / (ft / FNot) < 11 (9-1).

35. The zoom optical system according to claim 1, wherein, When the open F-value is set to Fnot when the telephoto end is focused on an object at infinity, and the sum of the distance on the optical axis from the lens surface closest to the object side of the first lens group to the lens surface closest to the image side of the subsequent group and the back focal length of the entire system in terms of air-converted distance is set to TLt when the telephoto end is focused on an object at infinity, the zoom optical system satisfies the condition (11) expressed by the following formula: 8 < FNot × (TLt / ft) < 17 (11).

36. The zoom optical system according to claim 1, wherein, When the focal length of the first lens group is set to f1 and the focal length of the lens group closest to the object in the subsequent group is set to fR1, the zoom optical system satisfies the condition (12) expressed by the following formula: 1.5 < f1 / fR1 < 17 (12).

37. The zoom optical system according to claim 1, which satisfies the condition (13) expressed by the following formula: 1.2 < TLw / ft < 2.2 (13).

38. The zoom optical system according to claim 1, which satisfies the condition (14) expressed by the following formula: 2.8 < ft / fw < 4 (14).

39. The zoom optical system according to claim 1, wherein, When the focal length of the first lens group is set to f1, the zoom optical system satisfies the condition (15) expressed by the following formula: 3 < f1 / (fw × ft). 1 / 2 <9 (15).

40. The zoom optical system according to claim 1, wherein, When the telephoto end is focused on an object at infinity, the sum of the distance on the optical axis from the lens surface of the first lens group closest to the object to the lens surface of the subsequent lens group closest to the image and the back focal length of the entire system in terms of air-converted distance is set to TLt. The zoom optical system satisfies the condition (16) expressed by the following formula: 1.25 < TLt / TLw < 1.6 (16).

41. The zoom optical system according to claim 1, wherein, When the focal length of the subsequent group is set to fRw when the wide-angle end is focused on an object at infinity, the zoom optical system satisfies the condition (17) expressed by the following formula: 0.3 < fw / fRw < 1.2 (17).

42. The zoom optical system according to claim 1, wherein, When the focal length of the subsequent group is set to fRt when the telephoto end is focused on an object at infinity, the zoom optical system satisfies the condition (18) expressed by the following formula: 0.6 < ft / fRt < 5 (18).

43. The zoom optical system according to claim 1, wherein, When the focal length of the lens group closest to the object in the subsequent group is set to fR1, the zoom optical system satisfies the condition (19) expressed by the following formula: 0.05 < fR1 / (fw×ft). 1 / 2 <3 (19).

44. The zoom optical system according to claim 1, wherein, When the focal length of the lens group closest to the object in the subsequent group is set to fR1, the zoom optical system satisfies the condition (20) expressed by the following formula: 0.15 < fw / fR1 < 2 (20).

45. The zoom optical system according to claim 1, wherein, The subsequent group is equipped with an anti-vibration group that moves in a direction intersecting the optical axis when correcting image jitter. When the focal length of the anti-vibration group is set to fIS, the zoom optical system satisfies the condition (21) expressed by the following formula: 0.2 < |fIS / ft| < 2 (21).

46. ​​The zoom optical system according to claim 1, wherein, The subsequent group is configured with at least one focusing group that moves along the optical axis during focusing. When the focal length of at least one of the focusing groups is set to ff, the zoom optical system satisfies the condition (22) expressed by the following formula: 0.2 < |ff / ft| < 1.4 (22).

47. The zoom optical system according to claim 1, wherein, The subsequent group includes an Lrn lens with negative refractive power, wherein the image-side surface of the Lrn lens is aspherical, and the refractive power of the aspherical surface at the position of maximum effective diameter is shifted in the positive direction compared with the refractive power in the paraxial region.

48. The zoom optical system according to claim 47, wherein, The image-side surface of the Lrn lens is concave in the paraxial region and convex in the periphery, including the position of the maximum effective diameter.

49. The zoom optical system according to claim 1, wherein, The focusing group that moves along the optical axis during focusing is only configured in the subsequent group.

50. The zoom optical system according to claim 49, wherein, The two focus groups, which move by changing their mutual spacing during focusing, are configured in the subsequent group.

51. The zoom optical system according to claim 1, wherein, The first lens group includes a joint lens, which is sequentially joined from the object side to a negative meniscus lens with its convex surface facing the object side and a positive lens with its convex surface facing the object side. When the refractive index of the negative meniscus lens relative to the d-line is set to Ndn and the Abbe number of the d-line reference of the negative meniscus lens is set to νdn, the zoom optical system satisfies the condition (23) expressed by the following formula: 1.94<Ndn+0.01×νdn<2.5 (23).

52. The zoom optical system according to claim 51, wherein, When the refractive index of the positive lens with the convex side facing the object is set to Ndp relative to the d-line, and the Abbe number of the d-line reference of the positive lens with the convex side facing the object is set to νdp, the zoom optical system satisfies the condition (24) expressed by the following formula: 2<Ndp+0.01×νdp<2.6 (24).

53. The zoom optical system according to claim 1, wherein, When the average Abbe number of the d-line reference of all positive lenses in the first lens group is set to νd1p_ave, the zoom optical system satisfies the condition (25) expressed by the following formula: 40 < νd1p_ave < 85 (25).

54. The zoom optical system according to claim 1, wherein, When the sum of the thicknesses on the optical axis of all the lenses in the first lens group is set as d1sum and the focal length of the first lens group is set as f1, the zoom optical system satisfies the condition (26) expressed by the following formula: 0.01 < d1sum / f1 < 0.2 (26).

55. The zoom optical system according to claim 1, wherein, The intermediate group consists of two lens groups with negative refractive power. When the focal length of the lens group closest to the object side of the intermediate group is set to fM1 and the focal length of the lens group closest to the image side of the intermediate group is set to fM2, the zoom optical system satisfies the condition (27) expressed by the following formula: 0.01 < fM1 / fM2 < 1.6 (27).

56. The zoom optical system according to claim 1, wherein, The subsequent lens group consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group, arranged sequentially from the object side to the image side.

57. The zoom optical system according to claim 56, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (28) expressed by the following formula: 0.2 < fR1 / (-fR2) < 2 (28).

58. The zoom optical system according to claim 1, wherein, The subsequent lens group consists of a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, and a third subsequent lens group with negative refractive power, arranged sequentially from the object side to the image side.

59. The zoom optical system according to claim 58, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (29) expressed by the following formula: 0.4 < fR2 / (-fR3) < 3.7 (29).

60. The zoom optical system according to claim 58, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (30) expressed by the following formula: 0.3 < fR1 / fR2 < 4 (30).

61. The zoom optical system according to claim 1, wherein, The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, a third subsequent lens group with positive refractive power, and a fourth subsequent lens group with negative refractive power.

62. The zoom optical system according to claim 61, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (28A) expressed by the following formula: 0.2 < fR1 / (-fR2) < 1.5 (28A).

63. The zoom optical system according to claim 61, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (31) expressed by the following formula: 0.3 < (-fR2) / fR3 < 2.4 (31).

64. The zoom optical system according to claim 61, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (32) expressed by the following formula: 0.1 < fR1 / fR3 < 1.4 (32).

65. The zoom optical system according to claim 61, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the fourth subsequent lens group is set to fR4, the zoom optical system satisfies the condition (33) expressed by the following formula: 0.15 < (-fR2) / (-fR4) < 1.8 (33).

66. The zoom optical system according to claim 1, wherein, The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, and a fourth subsequent lens group with positive refractive power.

67. The zoom optical system according to claim 66, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (34) expressed by the following formula: 0.4 < fR1 / (-fR3) < 2.5 (34).

68. The zoom optical system according to claim 66, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (29A) expressed by the following formula: 0.3 < fR2 / (-fR3) < 3.5 (29A).

69. The zoom optical system according to claim 66, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (30A) expressed by the following formula: 0.3 < fR1 / fR2 < 5 (30A).

70. The zoom optical system according to claim 66, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the fourth subsequent lens group is set to fR4, the zoom optical system satisfies the condition (35) expressed by the following formula: 0.1 < fR2 / fR4 < 2 (35).

71. The zoom optical system according to claim 1, wherein, The subsequent lens group consists of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with positive refractive power, a fourth subsequent lens group, and a fifth subsequent lens group.

72. The zoom optical system according to claim 71, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (30B) expressed by the following formula: 0.1 < fR1 / fR2 < 4.5 (30B).

73. The zoom optical system according to claim 71, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (36) expressed by the following formula: 0.2 < fR2 / fR3 < 3 (36).

74. The zoom optical system according to claim 1, wherein, The subsequent lens group consists of, from the object side to the image side, a first subsequent lens group with positive refractive power, a second subsequent lens group with positive refractive power, a third subsequent lens group with negative refractive power, a fourth subsequent lens group with negative refractive power, and a fifth subsequent lens group with positive refractive power.

75. The zoom optical system according to claim 74, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (30C) expressed by the following formula: 0.2 < fR1 / fR2 < 4 (30C).

76. The zoom optical system according to claim 74, wherein, When the focal length of the third subsequent lens group is set to fR3 and the focal length of the fourth subsequent lens group is set to fR4, the zoom optical system satisfies the condition (37) expressed by the following formula: 0.01 < fR3 / fR4 < 4 (37).

77. The zoom optical system according to claim 1, wherein, The subsequent lens group, sequentially from the object side to the image side, includes at least a first subsequent lens group with positive refractive power, a second subsequent lens group with negative refractive power, and a third subsequent lens group with negative refractive power.

78. The zoom optical system according to claim 77, wherein, When the focal length of the first subsequent lens group is set to fR1 and the focal length of the second subsequent lens group is set to fR2, the zoom optical system satisfies the condition (28B) expressed by the following formula: 0.2 < fR1 / (-fR2) < 1.8 (28B).

79. The zoom optical system according to claim 77, wherein, When the focal length of the second subsequent lens group is set to fR2 and the focal length of the third subsequent lens group is set to fR3, the zoom optical system satisfies the condition (38) expressed by the following formula: 0.05 < (-fR2) / (-fR3) < 1.2 (38).

80. A camera device comprising the zoom optical system of any one of claims 1 to 79.

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