Zoom lens and imaging apparatus including the same

Abstract

To provide a compact zoom lens with a wide angle of view and high optical performance.SOLUTION: A zoom lens includes: a first lens group, which is arranged closest to an object side, does not move for zooming, and has positive refractive power; a lens group GR, which is arranged closest to an image side, does not move for zooming, and has positive refractive power; and a lens group GP which is arranged adjacent to the object side of the lens group GR and moves for zooming. The lens group GR consists of a subgroup GRN having negative refractive power and a subgroup GRP having positive refractive power, which are arranged with the longest air gap on an optical axis in the lens group GR, and configuration of the subgroup GRN and lateral magnification of the lens group GR are appropriately set.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a zoom lens, which is suitable for use in imaging devices such as digital video cameras, digital still cameras, broadcast cameras, and surveillance cameras. [Background technology]

[0002] Zoom lenses used in imaging devices such as television cameras, movie cameras, broadcast cameras, and video cameras are required to be small and lightweight, have a wide angle of view, a high zoom ratio, and high optical performance. In addition, with the use of imaging elements compatible with high resolutions such as 4K and 8K, the optical image they form must have high resolution from the center to the periphery and little chromatic aberration.

[0003] A positive-lead zoom lens is known as a zoom lens with a wide angle of view and a high zoom ratio, in which, from the object side to the image side, a first lens group with positive refractive power and a second lens group with negative refractive power that moves for zooming are arranged. Patent Document 1 discloses a zoom lens that includes, from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, multiple lens groups that move for zooming, and a lens group with positive refractive power that does not move for zooming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-12908 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the zoom lens of Patent Document 1, if an attempt is made to achieve a wider angle of view or a higher zoom ratio, this may be disadvantageous in terms of optical performance and size reduction.

[0006] An object of the present invention is to provide a small, lightweight zoom lens having a wide angle of view, a high zoom ratio and high optical performance. [Means for solving the problem]

[0007] A zoom lens of the present invention has a first lens group having positive refractive power and arranged closest to the object side, which does not move for zooming, a lens group GR having positive refractive power and arranged closest to the image side, which does not move for zooming, and a lens group GP arranged adjacent to the object side of the lens group GR and which moves for zooming, in which the spacing between adjacent lens groups changes during zooming, the lens group GR is composed of a subgroup GRN having negative refractive power and a subgroup GRP having positive refractive power, which are arranged across the longest air gap on the optical axis of the lens group GR, and when the average Abbe number of the material of the negative lens included in the subgroup GRN taken as the d-line is νdGRNn, the average Abbe number of the material of the positive lens included in the subgroup GRN taken as the d-line is νdGRNp, and the lateral magnification of the lens group GR is βGR, 0.0<νdGRNn-νdGRNp<50.0 0.1<βGR<0.7 The present invention is characterized in that the following conditional expression is satisfied: Effect of the Invention

[0008] According to the present invention, it is possible to obtain a small and lightweight zoom lens having a wide angle of view, a high zoom ratio and high optical performance. [Brief description of the drawings]

[0009] [Figure 1] 1 is a lens cross-sectional view of a zoom lens of a first embodiment at a wide-angle end. [Diagram 2] 4A and 4B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 1. [Diagram 3] FIG. 11 is a lens cross-sectional view of a zoom lens of a second embodiment at a wide-angle end. [Figure 4]10A and 10B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 2. [Diagram 5] FIG. 11 is a lens cross-sectional view of a zoom lens of a third embodiment at a wide-angle end. [Figure 6] 11A and 11B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 3. [Figure 7] FIG. 11 is a lens cross-sectional view of a zoom lens of Example 4 at the wide-angle end. [Figure 8] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 4. [Figure 9] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 5 at the wide-angle end. [Figure 10] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 5. [Figure 11] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 6 at the wide-angle end. [Figure 12] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 6. [Figure 13] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 7 at the wide-angle end. [Figure 14] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 7. [Figure 15] FIG. 2 is a configuration diagram of an imaging device in each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a zoom lens and an image pickup apparatus having the same according to the present invention will be described in detail with reference to the accompanying drawings.

[0011] 1, 3, 5, 7, 9, 11, and 13 are cross-sectional views of the zoom lenses of Examples 1 to 7 at the wide-angle end and focused at infinity. The zoom lenses of the respective Examples are used in imaging devices such as digital video cameras, digital still cameras, broadcast cameras, cameras for silver halide film, surveillance cameras, and vehicle-mounted cameras.

[0012] In each lens cross-sectional view, the left side is the object side and the right side is the image side. The zoom lens of each embodiment may be used as a projection lens for a projector, etc. In this case, the left side is the screen side and the right side is the projected image side.

[0013] The zoom lens of each embodiment includes a first lens group L1 with positive refractive power that does not move for zooming, an intermediate group GM including two or more lens groups that move for zooming, and a lens group GR with positive refractive power that does not move for zooming, which are arranged in order from the object side to the image side. The lens group GR is the lens group arranged closest to the image side. The intermediate group GM includes a lens group GP that moves for zooming, and the lens group GP is arranged adjacent to the object side of the lens group GR. Here, the lens group is a group of one or more lenses that move as a unit during zooming from the wide-angle end to the telephoto end. In other words, the interval between adjacent lens groups changes during zooming. The lens group GR is composed of a subgroup GRN with negative refractive power and a subgroup GRP with positive refractive power, which are arranged with the longest air gap dIE on the optical axis in the lens group GR.

[0014] The arrows in each lens cross-sectional diagram show the movement trajectory of each lens group during zooming from the wide-angle end to the telephoto end. The wide-angle end and telephoto end respectively indicate the maximum angle of view (shortest focal length) and minimum angle of view (maximum focal length) zoom states when the lens group that moves during zooming is located at the two ends of the range that it can move mechanically or controllably on the optical axis.

[0015] In each lens cross-sectional view, SP is an aperture stop. P is an optical block equivalent to an optical filter, face plate, low-pass filter, infrared cut filter, etc. I is an image plane, and when the zoom lens of each embodiment is used as a surveillance camera or broadcast camera, the imaging plane of a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor is disposed thereon. When the zoom lens of each embodiment is used as the photographing optical system of a silver halide film camera, a photosensitive surface equivalent to the film surface is disposed on the image plane I.

[0016] 2(A), 4(A), 6(A), 8(A), 10(A), 12(A), and 14(A) are aberration diagrams of the zoom lenses of Examples 1 to 7 when focused on an object distance of infinity at the wide-angle end, respectively. 2(B), 4(B), 6(B), 8(B), 10(B), 12(B), and 14(B) are aberration diagrams of the zoom lenses of Examples 1 to 7 when focused on an object distance of infinity at the telephoto end, respectively.

[0017] The spherical aberration diagram shows the spherical aberration at the d-line (wavelength 587.6 nm) and g-line (wavelength 435.8 nm) with a solid line and a two-dot chain line, respectively. The astigmatism diagram shows the astigmatism at the meridional image plane and the sagittal image plane with a dashed line and a solid line, respectively. The distortion diagram shows the distortion at the d-line. The chromatic aberration diagram shows the lateral chromatic aberration at the d-line and the g-line with a solid line and a two-dot chain line, respectively. Fno represents the F-number, and ω represents the half angle of view (°). The full scale of the horizontal axis of the spherical aberration diagram is ±0.200 mm, and the full scale of the horizontal axis of the astigmatism diagram is also ±0.200 mm. The full scale of the horizontal axis of the distortion diagram is ±10.000%. The full scale of the horizontal axis of the chromatic aberration diagram is ±0.050 mm. ω is the imaging half angle of view (°).

[0018] Next, the characteristic configuration of the zoom lens of each embodiment will be described. In each embodiment, the subgroup GRN is composed of two or less negative lenses and two or less positive lenses. This makes it possible to obtain a zoom lens that is small and lightweight yet has high optical performance. In addition, the positive lens is disposed closest to the object in the subgroup GRN.

[0019] Moreover, the zoom lens of each embodiment is configured to satisfy the following conditional expressions. 0.0<νdGRNn-νdGRNp<50.0...(1) 0.1<βGR<0.7 (2)

[0020] Here, the average Abbe number of the material of the negative lenses included in the subgroup GRN with respect to the d-line is νdGRNn, the average Abbe number of the material of the positive lenses included in the subgroup GRN with respect to the d-line is νdGRNp, and the lateral magnification of the lens group GR is βGR. The Abbe number νd with respect to the d-line is defined as νd=(Nd-1) / (NF-NC), where NF, Nd, and NC are the refractive indices at the F-line (wavelength 486.1 nm), d-line (wavelength 587.6 nm), and C-line (wavelength 656.3 nm), respectively.

[0021] Conditional formula (1) is a conditional formula that specifies the relationship between the average Abbe number νdGRNn of the material of the negative lens included in the subgroup GRN based on the d-line and the average Abbe number νdGRNp of the material of the positive lens included in the subgroup GRN based on the d-line. Exceeding the upper limit of conditional formula (1) is undesirable because it leads to overcorrection of axial chromatic aberration. Falling below the lower limit of conditional formula (1) is undesirable because it becomes difficult to satisfactorily correct axial chromatic aberration caused by the negative lens included in the subgroup GRN.

[0022] Conditional formula (2) defines the lateral magnification βGR of the lens group GR. If the upper limit of conditional formula (2) is exceeded, the lateral magnification βGR of the lens group GR becomes too high, causing the lens group GR to excessively converge the light beam. As a result, axial chromatic aberration and other aberrations occur frequently, which is undesirable. If the lower limit of conditional formula (2) is exceeded, the lateral magnification βGR of the lens group GR becomes too low, which leads to an increase in the size of the zoom lens, which is undesirable.

[0023] With the above configuration, it is possible to realize a small, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance.

[0024] In each embodiment, it is preferable to set the numerical ranges of conditional expressions (1) and (2) as follows: 1.0<νdGRNn-νdGRNp<40.0 (1a) 0.1<βGR<0.6 (2a)

[0025] It is more preferable to set the numerical ranges of the conditional expressions (1) and (2) as follows: 1.5<νdGRNn-νdGRNp<30.0 (1b) 0.1<βGR<0.5 (2b)

[0026] It is more preferable to set the numerical ranges of the conditional expressions (1) and (2) as follows: 2.0<νdGRNn-νdGRNp<27.0 (1c) 0.2<βGR<0.5 (2c)

[0027] Furthermore, it is preferable that the zoom lens of each embodiment satisfies one or more of the following conditional expressions. 1.6 <dIE / fw<15.0···(3) -0.1<1 / (fGRN / fw)<0.0 (4) -1.0<1 / βGRN<1.0 (5) 0.0<νdGRPn-νdGRPp<50.0...(6) -0.05<βfn<0.05 (7)

[0028] Here, the focal length of the zoom lens at the wide-angle end is fw, the longest air gap on the optical axis in the lens group GR is dIE, the focal length of the subgroup GRN is fGRN, and the lateral magnification of the subgroup GRN is βGRN. The average Abbe number based on the d-line of the material of the negative lenses included in the subgroup GRP is νdGRPn, and the average Abbe number based on the d-line of the material of the positive lenses included in the subgroup GRP is νdGRPp. In addition, the combined lateral magnification of the first lens group L1 to the subgroup GRN at the wide-angle end is βfn.

[0029] The technical meaning of each conditional expression will be explained below. Conditional expression (3) is a conditional expression that specifies the ratio between the focal length fw of the zoom lens at the wide-angle end and the longest air gap dIE on the optical axis in the lens group GR. If the upper limit value of conditional expression (3) is exceeded, the lens group GR becomes large, which leads to a large size of the entire zoom lens system, which is not preferable. If the lower limit value of conditional expression (3) is exceeded, it becomes difficult to satisfactorily correct axial chromatic aberration, which is also not preferable.

[0030] Conditional formula (4) defines the ratio between the focal length fw of the zoom lens at the wide-angle end and the focal length fGRN of the subgroup GRN. If the numerical range of conditional formula (4) is not satisfied, the refractive power of the subgroup GRN will fall outside the appropriate range, making it difficult to effectively correct various aberrations, which is undesirable.

[0031] Conditional formula (5) is a conditional formula that defines the lateral magnification βGRN of the subgroup GRN. If the numerical range of conditional formula (5) is exceeded, it becomes difficult to make the light beam incident on the subgroup GRN closer to a parallel beam. As a result, for example, when an optical system is inserted or removed between the subgroup GRN and the subgroup GRP, the optical performance fluctuates significantly, which is not preferable.

[0032] Conditional formula (6) defines the relationship between the average Abbe number νdGRPn of the material of the negative lens included in the subgroup GRP with respect to the d-line and the average Abbe number νdGRPp of the material of the positive lens included in the subgroup GRP with respect to the d-line. If the numerical range of conditional formula (6) is exceeded, it becomes difficult to effectively correct lateral chromatic aberration, which is undesirable.

[0033] Conditional formula (7) is a conditional formula that specifies the composite lateral magnification βfn from the first lens group L1 to the subgroup GRN at the wide-angle end. If the upper limit of conditional formula (7) is exceeded, the light beam emitted from the subgroup GRN will be excessively converged. As a result, for example, when an optical system is inserted or removed between the subgroup GRN and the subgroup GRP, the optical performance will vary significantly, which is not preferable. If the lower limit of conditional formula (7) is exceeded, the light beam emitted from the subgroup GRN will be excessively diverged. As a result, the subgroup GRP will become larger, which is not preferable.

[0034] In each embodiment, it is preferable to set the numerical ranges of the conditional expressions (3) to (7) as follows: 1.6 <dIE / fw<13.0···(3a) -0.09<1 / (fGRN / fw)<0.0 (4a) -0.5<1 / βGRN<0.99···(5a) 5.0<νdGRPn-νdGRPp<45.0 (6a) -0.04<βfn<0.04 (7a)

[0035] It is even more preferable to set the numerical ranges of the conditional expressions (3) to (7) as follows: 1.6 <dIE / fw<11.0···(3b) -0.08<1 / (fGRN / fw)<-0.001 (4b) -0.1<1 / βGRN<0.99 (5b) 10.0<νdGRPn-νdGRPp<40.0 (6b) -0.03<βfn<0.03 (7b)

[0036] It is more preferable to set the numerical ranges of the conditional expressions (3) to (7) as follows: 1.6 <dIE / fw<9.0···(3c) -0.07<1 / (fGRN / fw)<-0.001...(4c) -0.05<1 / βGRN<0.99···(5c) 15.0<νdGRPn-νdGRPp<35.0...(6c) -0.02<βfn<0.02 (7c)

[0037] Next, the detailed configuration of the zoom lens of each embodiment will be described.

[0038] [Example 1] The zoom lens of the first embodiment is composed of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with positive refractive power, and a fifth lens group L5 with positive refractive power, which are arranged in this order from the object side to the image side. The fourth lens group L4 corresponds to the lens group GP, and the fifth lens group L5 corresponds to the lens group GR. During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fifth lens group L5 are stationary, the second lens group L2 moves monotonically from the object side to the image side, and the third lens group L3 and the fourth lens group L4 move. An aperture stop SP is arranged between the fourth lens group L4 and the fifth lens group L5.

[0039] [Example 2] The zoom lens of the second embodiment includes a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with negative refractive power, which are arranged in this order from the object side to the image side. Furthermore, a fifth lens group L5 (lens group GP) with positive refractive power and a sixth lens group L6 (lens group GR) with positive refractive power are arranged on the image side of the fourth lens group L4. During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the sixth lens group L6 are stationary, the second lens group L2 and the third lens group L3 move monotonically from the object side to the image side, and the fourth lens group L4 and the fifth lens group L5 move. An aperture stop SP is arranged between the fifth lens group L5 and the sixth lens group L6.

[0040] [Examples 3, 4, 5, 6, and 7] The configurations of the zoom lenses in the third, fourth, fifth, sixth and seventh embodiments are the same as the configuration of the zoom lens in the first embodiment.

[0041] Numerical examples 1 to 7 corresponding to the first to seventh embodiments, respectively, are shown below.

[0042] In the surface data of each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the axial spacing (distance on the optical axis) between the mth surface and the (m+1)th surface. Here, m is the surface number counted from the light incident side. In addition, nd represents the refractive index of each optical member with respect to the d-line, and νd represents the Abbe number of the optical member. The Abbe number νd of a certain material is given by the following when the refractive indices at the Fraunhofer lines d-line (587.6 nm), F-line (486.1 nm), C-line (656.3 nm), and g-line (wavelength 435.8 nm) are Nd, NF, and NC, respectively: νd=(Nd-1) / (NF-NC) It is expressed as:

[0043] The focal length (mm), F-number, and half angle of view (°) are the values ​​when the zoom lens is focused on an object at infinity. The total lens length is the distance on the optical axis from the lens surface closest to the object to the final surface (the lens surface closest to the image) of the zoom lens, plus the back focus BF. The back focus BF is the distance on the optical axis from the final surface of the zoom lens to the image surface, expressed in air equivalent length.

[0044] If the optical surface is aspheric, a * symbol is added to the right of the surface number. The aspheric shape is expressed by the following formula. x=(h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 ]+A3×h 3 +A4×h 4 +A5×h 5 +A6×h 6 +A7×h 7 +A8×h 8 +A9×h 9 +A10×h 10 +A11×h 11 +A12×h 12 +A13×h 13 +A14×h 14 +A15×h 15 +A16×h 16 Here, x is the amount of displacement from the vertex of the surface in the optical axis direction, h is the height from the optical axis in the direction perpendicular to the optical axis, R is the paraxial radius of curvature, and k is the conic constant. Additionally, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, and A16 are aspheric coefficients of each order. Note that "e±XX" in each aspheric coefficient is expressed as "×10 ±XX " It means.

[0045] [Numerical Example 1] Unit: mm Surface Data Surface number rd nd νd 1 -149.059 1.50 1.76634 35.8 2 133.529 5.10 3 181.054 11.74 1.43387 95.1 4 -127.668 0.20 5 257.936 7.03 1.43387 95.1 6 -257.936 7.09 7 165.831 5.74 1.43387 95.1 8 1350.737 0.15 9 126.151 11.11 1.43387 95.1 10 -221.313 0.49 11 63.698 5.87 1.76385 48.5 12 108.416 (variable) 13* 107.013 0.85 2.05090 26.9 14 12.679 5.36 15 -30.111 0.60 1.88300 40.8 16 -401.121 6.78 1.89286 20.4 17 -10.830 0.65 2.00100 29.1 18 -126.500 0.18 19 53.124 2.75 1.78472 25.7 20 -139.718 (variable) 21 -36.661 0.90 1.95375 32.3 22 125.708 3.28 1.92286 18.9 23 -79.329 (variable) 24 270.503 6.86 1.77250 49.6 25* -47.332 0.15 26 43.458 1.10 1.89286 20.4 27 25.980 7.23 1.64000 60.1 28 201.186 (variable) 29(Aperture) ∞ 2.48 30 -131.227 3.40 1.84666 23.8 31 -38.975 0.90 1.81600 46.6 32 519.453 35.00 33 45.791 4.93 1.75520 27.5 34 -176.937 2.78 35 367.396 0.90 2.00100 29.1 36 22.124 6.97 1.49700 81.5 37 -88.326 0.20 38 357.352 4.77 1.48749 70.2 39 -28.360 0.90 1.88300 40.8 40 -204.507 0.15 41 43.617 6.23 1.48749 70.2 42 -42.794 4.00 43∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞6.99 Image plane ∞ Aspheric Data Page 13 K = 1.99983e+00 A 4= 1.77649e-05 A 6=-5.29341e-08 A 8= 3.29999e-10 A10= 1.02584e-11 A12=-2.22171e-13 A14= 1.50679e-15 A16=-3.44562e-18 Page 25 K =-1.91921e-01 A 4= 8.11367e-07 A 6= 7.19921e-09 A 8=-1.46342e-10 A10= 1.41032e-12 A12=-6.88616e-15 A14= 1.65877e-17 A16=-1.56715e-20 Various data Zoom ratio 25.91 Wide Angle Mid-Telephoto Focal length 7.58 29.35 196.36 F-number 1.80 1.80 2.95 Angle of view 35.97 10.61 1.60 Image height 5.50 5.50 5.50 Lens total length 276.27 276.27 276.27 BF 40.21 40.21 40.21 d12 0.70 37.21 58.25 d20 68.05 12.89 3.40 d23 1.81 14.62 1.10 d28 3.17 9.01 10.98 Zoom lens group data Group starting plane focal length 1 1 72.15 2 13 -12.90 3 21 -71.58 4 24 36.72 5 30 52.74

[0046] [Numerical Example 2] Unit: mm Surface Data Surface number rd nd νd 1 -138.234 1.50 1.76634 35.8 2 170.307 3.00 3 338.059 9.37 1.43387 95.1 4 -127.590 0.20 5 313.524 6.64 1.43387 95.1 6 -192.054 7.10 7 122.116 6.38 1.43387 95.1 8 -25872.299 0.23 9 106.314 8.65 1.43387 95.1 10 -326.747 0.26 11 61.273 4.94 1.76385 48.5 12 95.552 (variable) 13* 56.137 0.40 2.05090 26.9 14 12.635 (variable) 15 -24.849 0.40 2.00100 29.1 16 38.456 8.26 1.89286 20.4 17 -10.415 0.40 2.00100 29.1 18 -76.934 0.18 19 71.811 2.56 1.76182 26.5 20 -126.719 (variable) 21 -172.115 0.50 1.88300 40.8 22 44.952 4.10 1.84666 23.8 23 -160.478 2.86 24 -34.526 0.50 1.88300 40.8 25 -83.742 (variable) 26* 209.117 6.13 1.72916 54.7 27 -40.907 0.20 28 86.596 6.42 1.64000 60.1 29 -57.682 1.00 1.95906 17.5 30 -147.085 (variable) 31(Aperture) ∞ 0.20 32 45.903 2.96 1.84666 23.8 33 114.086 0.70 1.95375 32.3 34 34.504 40.00 35 65.751 4.75 1.80518 25.4 36 -92.295 1.24 37 1946.788 0.70 1.88300 40.8 38 29.220 6.59 1.48749 70.2 39 -83.842 0.35 40 56.794 7.65 1.43875 94.7 41 -28.104 0.70 2.00100 29.1 42 -409.463 1.35 43 -989.440 4.70 1.49700 81.5 44 -30.294 4.00 45 ∞ 33.00 1.60859 46.4 46 ∞ 13.20 1.51633 64.1 47∞7.41 Image plane ∞ Aspheric Data Page 13 K = 1.42691e+00 A 4= 1.26196e-05 A 6= 3.32720e-08 A 8=-2.61470e-09 A10= 6.34657e-11 A12=-7.73970e-13 A14= 4.64465e-15 A16=-1.08712e-17 Page 26 K =-2.40244e-03 A 4=-2.90672e-06 A 6= 2.01624e-09 A 8=-4.49726e-12 A10= 1.00462e-14 A12=-8.67681e-18 Various data Zoom ratio 27.23 Focal length 7.49 30.11 203.99 F-number 1.80 1.80 3.30 Half angle of view 36.29 10.35 1.54 Image height 5.50 5.50 5.50 Lens length 272.94 272.94 272.94 BF 40.63 40.63 40.63 d12 0.61 35.69 55.91 d14 7.24 6.27 6.88 d20 67.13 13.73 5.63 d25 0.37 10.67 0.69 d30 2.91 11.90 9.15 Zoom lens group data Group starting plane focal length 1 1 70.95 2 13 -15.59 3 15 -50.78 4 21 -63.34 5 26 34.31 6 32 57.67

[0047] [Numerical Example 3] Unit: mm Surface Data Surface number rd nd νd 1 -166.391 2.80 1.74951 35.3 2 149.078 1.54 3 151.637 5.42 1.95906 17.5 4 321.568 3.86 5 642.689 11.47 1.60311 60.6 6* -136.804 8.78 7 152.251 2.50 1.84666 23.8 8 80.700 10.08 1.43875 94.7 9 513.453 6.13 10 124.656 10.50 1.43387 95.1 11 -271.138 0.20 12 68.071 9.74 1.59522 67.7 13 343.602 (variable) 14 159.046 0.95 1.75500 52.3 15 17.677 7.57 16 -31.690 0.75 1.49700 81.5 17 73.636 5.82 1.80000 29.8 18 -25.391 0.93 19 -21.647 1.20 1.76385 48.5 20* -264.193 (variable) 21 -68.095 4.14 1.80810 22.8 22 -32.517 1.10 1.90525 35.0 23 -141.980 (variable) 24* 58.534 8.71 1.77250 49.6 25 -74.409 0.20 26 144.197 1.10 1.85478 24.8 27 37.922 6.70 1.49700 81.5 28 -386.229 (variable) 29(Aperture) ∞ 2.00 30 173.968 6.15 1.76182 26.5 31 -59.546 0.90 2.00100 29.1 32 266.573 1.45 33 251.609 2.39 1.76182 26.5 34 -4630.633 43.16 35 84.841 7.35 1.49700 81.5 36 -49.395 5.13 37 -180.037 7.28 1.84666 23.8 38 -27.531 0.90 2.00100 29.1 39 -521.544 0.20 40 52.173 9.23 1.63980 34.5 41 -33.148 1.00 1.95375 32.3 42 38.160 0.87 43 33.646 8.50 1.51742 52.4 44 -99.045 43.71 Image plane ∞ Aspheric Data Side 6 K =-1.44366e+01 A 4=-6.38487e-07 A 6= 2.23141e-10 A 8=-8.29959e-14 A10= 2.34467e-17 A12=-3.26387e-21 Page 20 K = 5.65086e+01 A 4=-9.68290e-06 A 6=-4.72454e-09 A 8=-2.50862e-11 A10= 6.72799e-14 A12=-2.24784e-16 Page 24 K =-1.26445e+00 A 4=-2.06118e-06 A 6= 6.46308e-10 A 8= 7.85246e-13 A10=-4.37839e-15 A12= 5.11375e-18 Various data Zoom ratio 9.52 Wide Angle Mid-Telephoto Focal length 26.00 76.85 247.51 F-number 2.73 2.73 3.63 Angle of view 29.65 10.90 3.42 Image height 14.80 14.80 14.80 Lens total length 313.28 313.28 313.28 BF 43.71 43.71 43.71 d13 0.92 33.91 51.67 d20 54.06 5.12 2.14 d23 1.00 17.97 1.24 d28 4.89 3.86 5.82 Zoom lens group data Group starting plane focal length 1 1 80.54 2 14 -18.53 3 21 -120.02 4 24 47.93 5 30 121.04

[0048] [Numerical Example 4] Unit: mm Surface Data Surface number rd nd νd 1* 1164.523 2.50 1.83481 42.7 2 31.806 16.24 3* 116.859 2.00 1.83481 42.7 4 73.633 11.47 5 -91.374 1.80 1.83481 42.7 6 -390.193 0.15 7 90.685 4.30 1.92286 18.9 8 254.377 2.27 9 188.429 9.30 1.60300 65.4 10* -84.461 4.41 11 683.245 8.40 1.43387 95.1 12 -59.788 0.60 13 -54.986 1.70 1.80000 29.8 14 -126.219 0.18 15 167.309 1.70 1.91650 31.6 16 52.053 13.75 1.43875 94.7 17 -108.061 0.40 18 803.874 8.36 1.43387 95.1 19 -70.981 0.40 20 85.474 8.45 1.76385 48.5 21 -205.953 (variable) 22 55.970 0.70 2.00100 29.1 23 13.891 4.70 24 -37.737 0.70 1.88300 40.8 25 45.092 0.00 26 45.092 6.32 1.85478 24.8 27 -14.907 0.70 1.85150 40.8 28 93.123 0.71 29 34.631 3.27 1.64769 33.8 30 -130.870 (variable) 31 -32.995 0.80 1.72916 54.7 32 62.730 2.37 1.84666 23.8 33 -557.636 (variable) 34* 95.606 6.09 1.58913 61.1 35 -48.189 0.20 36 112.959 6.19 1.48749 70.2 37 -36.699 1.00 1.80100 35.0 38 -53.579 (variable) 39(Aperture) ∞ 3.06 40 -96.913 3.84 1.84666 23.8 41 -46.420 1.00 1.83481 42.7 42 -2097.238 35.50 43 95.809 4.96 1.63980 34.5 44 -46.690 0.77 45 -182.106 0.90 1.88300 40.8 46 30.015 5.03 1.48749 70.2 47 -128.853 0.20 48 59.263 7.70 1.43875 94.7 49 -21.626 0.90 2.00100 29.1 50 -69.038 0.14 51 132.223 5.45 1.48749 70.2 52 -31.625 4.00 53 ∞ 33.00 1.60859 46.4 54 ∞ 13.20 1.51680 64.2 55∞7.45 Image plane ∞ Aspheric Data Front page K = 0.00000e+00 A 4= 5.03102e-06 A 6= 4.83452e-08 A 8= 1.59416e-10 A10=-7.63677e-15 A12= 1.64471e-16 A14=-2.52910e-20 A16=-9.39669e-24 A 3=-1.19621e-06 A 5=-3.82397e-07 A 7=-3.83715e-09 A 9=-2.47278e-12 A11=-2.19296e-15 A13=-2.81837e-18 A15= 1.19260e-21 3rd page K = 0.00000e+00 A 4=-3.91833e-06 A 6=-1.36930e-07 A 8=-8.58604e-10 A10= 6.54807e-13 A12= 2.38917e-15 A14=-1.00159e-18 A16=-3.03481e-22 A 3= 2.79304e-06 A 5= 7.94989e-07 A 7= 1.44093e-08 A 9= 2.12004e-11 A11=-7.19102e-14 A13=-2.04972e-17 A15= 3.25713e-20 Side 10 K = 0.00000e+00 A 4= 9.86087e-07 A 6= 1.91585e-10 A 8=-9.03646e-13 A10= 9.05947e-16 A12=-1.75246e-18 A14= 2.11271e-21 A16=-9.30590e-25 Page 34 K =-3.11230e+01 A 4=-2.74594e-08 A 6=-3.90615e-09 A 8= 2.89026e-12 Various data Zoom ratio 13.61 Wide Angle Mid-Telephoto Focal length 4.43 15.50 60.24 F-number 1.86 1.86 2.77 Angle of view 51.16 19.54 5.21 Image height 5.50 5.50 5.50 Lens total length 298.66 298.66 298.66 BF 40.66 40.66 40.66 d21 0.65 30.27 43.40 d30 40.91 7.47 2.95 d33 13.10 17.10 2.09 d38 1.77 1.60 8.00 Zoom lens group data Group starting plane focal length 1 1 26.47 2 22 -17.26 3 31 -53.67 4 34 35.95 5 40 50.60

[0049] [Numerical Example 5] Unit: mm Surface Data Surface number rd nd νd 1 202.323 3.00 1.75500 52.3 2 142.859 3.45 3 166.010 14.07 1.43387 95.1 4 -536.333 0.47 5 -2160.193 3.00 1.75500 52.3 6 147.354 1.27 7 141.652 13.07 1.43387 95.1 8 -5023.156 12.85 9 177.654 9.27 1.43387 95.1 10 1497.524 0.20 11 160.006 11.72 1.43387 95.1 12 -1832.268 0.50 13 112.106 7.50 1.43387 95.1 14 182.774 (variable) 15 253.534 1.40 1.69930 51.1 16 31.656 2.42 17 47.123 10.62 1.61310 44.4 18 -32.822 1.30 1.59522 67.7 19 25.133 4.36 20 63.199 1.30 1.63858 55.2 21 33.589 5.97 1.67300 38.3 22 -81.115 2.62 23 -30.696 1.20 1.59522 67.7 24* 110.844 (variable) 25 375.463 1.00 1.69930 51.1 26 21.833 3.95 1.74951 35.3 27 111.123 2.67 28 -40.643 1.00 1.59522 67.7 29 270.808 (variable) 30* 62.470 5.68 1.59522 67.7 31 -128.831 0.20 32 66.597 7.34 1.43875 94.9 33 -34.439 1.30 1.64000 60.1 34 -126.161 (variable) 35(Aperture) ∞ 0.30 36 162.463 3.46 1.48749 70.2 37 -128.728 0.16 38 47.733 1.50 1.49700 81.5 39 25.156 33.95 40 21.424 7.62 1.43875 94.9 41 -58.819 0.20 42 41.577 6.46 1.43875 94.9 43 -23.735 1.20 1.65160 58.5 44 16.012 2.00 45 20.767 4.09 1.49700 81.5 46 -38.679 1.20 2.00100 29.1 47 43.170 9.14 48 62.713 4.87 1.80518 25.4 49 -39.952 1.20 1.85920 33.0 50 -61.291 4.87 51 ∞ 33.00 1.60859 46.4 52 ∞ 13.20 1.51680 64.2 53∞7.39 Image plane ∞ Aspheric Data Page 24 K = 0.00000e+00 A 4=-1.39423e-05 A 6= 4.66924e-09 A 8= 8.52883e-11 A10=-3.01113e-13 A12= 7.89726e-16 A 3= 2.82395e-06 A 5=-7.46597e-09 A 7=-9.43023e-10 Page 30 K =-5.07198e+00 A 4= 1.21006e-06 A 6=-1.28223e-09 A 8= 9.84531e-12 A10=-3.16405e-14 A12= 4.05911e-17 Various data Zoom ratio 39.95 Wide Angle Mid-Telephoto Focal length 14.00 57.12 559.31 F-number 2.81 2.80 5.09 Angle of view 21.45 5.50 0.56 Image height 5.50 5.50 5.50 Lens total length 383.01 383.01 383.01 BF 41.48 41.48 41.48 d14 4.00 71.87 110.63 d24 94.47 22.21 7.37 d29 23.45 30.04 1.93 d34 7.54 5.34 9.52 Zoom lens group data Group starting plane focal length 1 1 161.75 2 15 -25.56 3 25 -51.77 4 30 50.98 5 36 89.96

[0050] [Numerical Example 6] Unit: mm Surface Data Surface number rd nd νd 1 1161.973 3.00 1.83481 42.7 2* 55.708 10.48 3 202.598 2.30 1.85478 24.8 4 91.753 10.37 1.43875 94.7 5 -179.322 3.82 6 96.636 10.91 1.43387 95.1 7 -127.744 3.64 8 84.532 7.63 1.43875 94.7 9* 271.789 1.35 10* 86.189 6.25 1.76385 48.5 11 -526.736 (variable) 12* 452.536 0.80 1.95375 32.3 13 14.288 6.02 14 -34.746 0.80 1.88300 40.8 15 -342.558 6.64 1.89286 20.4 16 -12.125 0.60 1.95375 32.3 17 1468.209 0.18 18 48.950 3.77 1.62000 62.2 19 -53.156 (variable) 20 -29.258 0.75 1.71300 53.8 21 68.257 2.70 1.80810 22.8 22 -266.726 (variable) 23* 80.582 5.40 1.72916 54.7 24 -54.890 0.21 25 -250.931 1.10 1.85478 24.8 26 40.024 7.04 1.78336 49.5 27 -67.274 (variable) 28(Aperture) ∞ 2.89 29 265.955 7.18 1.72151 29.2 30 -36.469 0.90 1.74100 52.6 31 93.872 35.00 32 57.552 6.29 1.74840 27.7 33 -153.418 3.49 34 -1256.618 1.00 1.88300 40.8 35 20.318 9.12 1.49700 81.5 36 -54.978 0.35 37 62.438 4.73 1.43875 94.7 38 -32.455 1.00 2.00100 29.1 39 532.156 0.21 40 44.870 5.59 1.50137 56.4 41 -32.096 4.00 42∞ 33.00 1.60859 46.4 43 ∞ 13.20 1.51633 64.1 44∞5.99 Image plane ∞ Aspheric Data 2nd side K = 0.00000e+00 A 4=-3.88538e-07 A 6= 1.38805e-10 A 8= 2.55862e-14 A10= 9.31507e-18 9th page K = 0.00000e+00 A 4=-1.35128e-06 A 6=-4.70579e-10 A 8=-3.54412e-12 A10= 7.10965e-15 A12=-6.18795e-18 A14= 2.73136e-21 A16=-4.92221e-25 Side 10 K = 0.00000e+00 A 4=-8.86143e-07 A 6=-3.48567e-10 A 8=-2.07946e-12 A10= 3.61558e-15 A12=-2.85289e-18 A14= 1.12335e-21 A16=-1.80823e-25 Side 12 K =-1.04680e-01 A 4= 1.21567e-05 A 6=-4.36047e-08 A 8= 1.08229e-09 A10=-1.32183e-11 A12= 6.48790e-14 A14=-6.88863e-17 A16=-2.29401e-19 Page 23 K =-9.62925e-01 A 4=-4.37878e-06 A 6= 3.49608e-09 A 8=-9.13154e-12 A10= 2.27920e-14 A12=-1.74182e-17 Various data Zoom ratio 20.77 Wide Angle Mid-Telephoto Focal length 6.50 25.23 135.00 F-number 1.80 1.80 3.10 Angle of view 40.24 12.30 2.33 Image height 5.50 5.50 5.50 Lens length 277.98 277.98 277.97 BF 39.17 39.16 39.16 d11 0.68 35.84 56.10 d19 58.37 8.09 3.00 d22 6.14 13.16 0.07 d27 0.10 8.20 6.12 Zoom lens group data Group starting plane focal length 1 1 57.64 2 12 -15.86 3 20 -50.52 4 23 36.62 5 29 49.58

[0051] [Numerical Example 7] Unit: mm Surface Data Surface number rd nd νd 1 -257.691 1.50 1.76634 35.8 2 221.635 2.40 3 334.070 8.57 1.43387 95.1 4 -186.688 0.20 5 340.417 6.51 1.43387 95.1 6 -340.417 11.20 7 180.401 6.35 1.43387 95.1 8 2101.988 0.15 9 134.978 10.08 1.43387 95.1 10 -464.396 0.50 11 66.474 7.69 1.59522 67.7 12 130.178 (variable) 13* 175.260 0.85 2.05090 26.9 14 16.807 4.85 15 -27.316 0.60 1.88300 40.8 16 82.067 6.00 1.89286 20.4 17 -13.384 0.65 2.00100 29.1 18 -199.205 0.18 19 79.364 2.74 1.76182 26.5 20 -82.334 (variable) 21 -51.897 0.90 1.95375 32.3 22 118.334 2.81 1.92286 18.9 23 -132.642 (variable) 24 79.108 5.71 1.90525 35.0 25* -106.071 0.15 26 66.106 1.10 1.89286 20.4 27 30.199 7.32 1.59522 67.7 28 -311.245 (variable) 29(Aperture) ∞ 2.97 30 -84.230 2.45 1.80518 25.4 31 -43.498 0.90 1.77250 49.6 32 -336.920 35.00 33 98.516 3.93 1.84666 23.8 34 -107.493 3.94 35 1150.566 0.90 2.00100 29.1 36 27.790 4.29 1.49700 81.5 37 340.779 0.20 38 61.773 6.28 1.48749 70.2 39 -28.037 0.90 1.88300 40.8 40 -87.860 0.17 41 56.631 4.81 1.48749 70.2 42 -50.104 4.00 43∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞9.39 Image plane ∞ Aspheric Data Page 13 K =-2.00502e+00 A 4= 3.80730e-06 A 6= 1.20614e-08 A 8=-6.29626e-10 A10= 1.48952e-11 A12=-1.80263e-13 A14= 1.01064e-15 A16=-2.09742e-18 Page 25 K = 2.00037e+00 A 4= 1.55499e-06 A 6=-2.04172e-10 A 8=-4.31101e-13 A10= 2.12996e-14 A12=-1.56330e-16 A14= 4.56206e-19 A16=-4.80126e-22 Various data Zoom ratio 25.93 Wide Angle Mid-Telephoto Focal length 9.61 34.51 249.07 F-number 1.80 1.80 3.09 Angle of view 29.79 9.06 1.26 Image height 5.50 5.50 5.50 Lens total length 278.62 278.62 278.62 BF 42.61 42.61 42.61 d12 1.02 41.16 64.29 d20 71.37 14.25 2.56 d23 3.24 18.97 0.78 d28 4.64 5.89 12.66 Zoom lens group data Group starting plane focal length 1 1 88.17 2 13 -14.41 3 21 -87.45 4 24 40.02 5 30 54.56

[0052] The following table shows various values ​​for each example. "E-XX" stands for "x10 -XX " It means.

[0053] [Table 1]

[0054] [Imaging device] FIG. 15 shows a configuration example of an imaging device 125. In FIG. 15, 101 is a zoom lens according to any one of the first to eighth embodiments. 124 is a camera body. The zoom lens 101 is detachable from the camera body 124. In this figure, the first lens group L1 is shown as a lens group F, the middle group M as a lens group LZ, and the rear lens group LR as a lens group R. SP is an aperture stop, and 114 and 115 are drive mechanisms for driving the lens group that moves during focusing and the lens group that moves during zooming, respectively, and include a helicoid, a cam, and the like. 116 to 118 are motors (actuators) that drive the drive mechanisms 114 and 115 and the aperture stop SP. 119 to 121 are detectors for detecting the position of each lens group and the aperture diameter of the aperture stop SP, and are composed of an encoder, a potentiometer, a photosensor, and the like.

[0055] In the camera 124, reference numeral 109 denotes a glass block denoted by P in the first to seventh embodiments. Reference numeral 110 denotes an imaging element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that photoelectrically converts (captures) an object image formed by the zoom lens 101. Reference numerals 111 and 122 denote processing units that perform various types of processing and control in the camera 124 and the zoom lens 101, respectively, and include a processor such as a CPU.

[0056] By using the zoom lenses according to the first to seventh embodiments described above, it is possible to provide a small and lightweight imaging device 125 capable of obtaining good captured images.

[0057] The above-described embodiment includes the following configurations.

[0058] (Configuration 1) a first lens group having positive refractive power and arranged closest to the object side and not moving for zooming, a lens group GR having positive refractive power and arranged closest to the image side and not moving for zooming, and a lens group GP arranged adjacent to the object side of the lens group GR and moving for zooming, wherein a distance between adjacent lens groups changes during zooming, the lens group GR is composed of a subgroup GRN having a negative refractive power and a subgroup GRP having a positive refractive power, the subgroups being arranged at a distance on an optical axis of the lens group GR with a longest air gap therebetween, When the average Abbe number of the material of the negative lens included in the subgroup GRN based on the d-line is νdGRNn, the average Abbe number of the material of the positive lens included in the subgroup GRN based on the d-line is νdGRNp, and the lateral magnification of the lens group GR is βGR, 0.0<νdGRNn-νdGRNp<50.0 0.1<βGR<0.7 A zoom lens characterized by satisfying the following conditional expressions:

[0059] (Configuration 2) Let fw be the focal length of the zoom lens at the wide-angle end, and dIE be the longest air gap on the optical axis in the lens group GR. 1.6 <dIE / fw<15.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

[0060] (Configuration 3) When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the subgroup GRN is fGRN, -0.1<1 / (fGRN / fw)<0.0 3. The zoom lens according to configuration 1 or 2, wherein the following condition is satisfied:

[0061] (Configuration 4) When the lateral magnification of the subgroup GRN is β GRN, -1.0<1 / βGRN<1.0 4. The zoom lens according to any one of configurations 1 to 3, wherein the following condition is satisfied:

[0062] (Configuration 5) When the average Abbe number of the material of the negative lens included in the subgroup GRP based on the d-line is νdGRPn, and the average Abbe number of the material of the positive lens included in the subgroup GRP based on the d-line is νdGRPp, 0.0<νdGRPn-νdGRPp<50.0 5. The zoom lens according to any one of configurations 1 to 4, which satisfies the following conditional expression:

[0063] (Configuration 6) When the composite lateral magnification from the first lens group to the subgroup GRN at the wide-angle end is βfn, -0.05<βfn<0.05 6. The zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied:

[0064] (Configuration 7) 7. The zoom lens according to any one of configurations 1 to 6, wherein the subgroup GRN is composed of two or less negative lenses and two or less positive lenses.

[0065] (Configuration 8) The zoom lens according to any one of configurations 1 to 7, wherein the lens arranged closest to the object side in the subgroup GRN is a positive lens.

[0066] (Configuration 9) The zoom lens according to any one of configurations 1 to 8, characterized in that it comprises, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having positive refractive power that moves for zooming, and a fifth lens group having positive refractive power that does not move for zooming.

[0067] (Configuration 10) The zoom lens according to any one of configurations 1 to 8, characterized in that it comprises, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, a fifth lens group having positive refractive power that moves for zooming, and a sixth lens group having positive refractive power that does not move for zooming.

[0068] (Configuration 11) 11. An imaging apparatus comprising: the zoom lens according to any one of configurations 1 to 10; and an imaging element that photoelectrically converts an image formed by the zoom lens. [Explanation of symbols]

[0069] L1 First lens group GP Lens Group GP GR Lens GroupGR GRN subgroup GRN GRP subgroup GRP

Claims

1. A zoom lens comprising: a first lens group having positive refractive power and arranged closest to the object side, which does not move for zooming; a lens group GR having positive refractive power and arranged closest to the image side, which does not move for zooming; and a lens group GP arranged adjacent to the object side of the lens group GR and which moves for zooming, wherein a distance between adjacent lens groups changes during zooming, the lens group GR is composed of a subgroup GRN having a negative refractive power and a subgroup GRP having a positive refractive power, the subgroups being arranged to be spaced apart from each other by the longest air gap on the optical axis of the lens group GR, When the average Abbe number of the material of the negative lens included in the subgroup GRN with respect to the d-line is νdGRNn, the average Abbe number of the material of the positive lens included in the subgroup GRN with respect to the d-line is νdGRNp, and the lateral magnification of the lens group GR is βGR, 0.0<νdGRNn−νdGRNp<50.0 0.1<βGR<0.7 A zoom lens characterized by satisfying the following conditional expressions:

2. When the focal length of the zoom lens at the wide-angle end is fw and the longest air gap on the optical axis in the lens group GR is dIE, 1.6<dIE / fw<15.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the subgroup GRN is fGRN, -0.1<1 / (fGRN / fw)<0.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. When the lateral magnification of the subgroup GRN is β GRN, -1.0<1 / βGRN<1.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. When the average Abbe number of the material of the negative lens included in the subgroup GRP with respect to the d-line is νdGRPn, and the average Abbe number of the material of the positive lens included in the subgroup GRP with respect to the d-line is νdGRPp, 0.0<νdGRPn−νdGRPp<50.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. When the composite lateral magnification from the first lens group to the subgroup GRN at the wide-angle end is βfn, -0.05<βfn<0.05 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. 2. The zoom lens according to claim 1, wherein the subgroup GRN is composed of two or less negative lenses and two or less positive lenses.

8. 2. The zoom lens according to claim 1, wherein the lens arranged closest to the object side in said subgroup GRN is a positive lens.

9. 2. The zoom lens according to claim 1, comprising, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having positive refractive power that moves for zooming, and a fifth lens group having positive refractive power that does not move for zooming.

10. 2. The zoom lens according to claim 1, comprising, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, a fifth lens group having positive refractive power that moves for zooming, and a sixth lens group having positive refractive power that does not move for zooming.

11. When the focal length of the zoom lens at the wide-angle end is fw and the longest air gap on the optical axis in the lens group GR is dIE, 1.6<dIE / fw<15.0 11. The zoom lens according to claim 3, which satisfies the following condition:

12. When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the subgroup GRN is fGRN, -0.1<1 / (fGRN / fw)<0.0 11. The zoom lens according to claim 4, wherein the following condition is satisfied:

13. Let f be the focal length of the zoom lens at the wide-angle end, d be the longest air gap on the optical axis in the lens group GR, and f be the focal length of the subgroup GRN. 1.6<dIE / fw<15.0 -0.1<1 / (fGRN / fw)<0.0 11. The zoom lens according to claim 4, wherein the following condition is satisfied:

14. 11. An imaging apparatus comprising: the zoom lens according to claim 1; and an imaging element that photoelectrically converts an image formed by the zoom lens.

Images