Zoom lens and image pickup apparatus

Abstract

The present application provides a zoom lens which is small and has good optical performance, and an imaging device provided with the zoom lens. The zoom lens includes, in order from an object side to an image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate lens group including one or two lens groups, and a final lens group. During zooming, the second lens group moves along the optical axis, and the intervals of the adjacent lens groups are all changed.

Description

TECHNICAL FIELD

[0001] The present application relates to a zoom lens and an image pickup apparatus. BACKGROUND

[0002] In the past, as a zoom lens that can be applied to an image pickup apparatus such as a broadcast camera, a movie camera, and a digital still camera, for example, the lens systems described in Patent Literature 1, Patent Literature 2, and Patent Literature 3 are known.

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2018-194730

[0004] Patent Literature 2: Japanese Patent Application Publication No. 2017-181719

[0005] Patent Literature 3: Japanese Patent Application Publication No. 2017-083782 SUMMARY

[0006] In recent years, there is a demand for a zoom lens that is small in size and has good optical performance.

[0007] The present application has been achieved in view of the above-described circumstances, and aims to provide a zoom lens that is small in size and has good optical performance, and an image pickup apparatus provided with the zoom lens.

[0008] In the zoom lens according to the first aspect of the present application, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate lens group including one or two lens groups, and a final lens group are sequentially arranged from an object side to an image side. When zooming, the second lens group moves along the optical axis, and the intervals of the adjacent lens groups are changed.

[0009] In the zoom lens according to the second aspect of the present application, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate lens group including one or two lens groups, and a final lens group having positive refractive power are sequentially arranged from an object side to an image side, and when zooming, the second lens group moves along the optical axis, and the intervals of the adjacent lens groups are changed. At least one of the intermediate lens group and the final lens group includes a pair of positive lens and negative lens arranged adjacent to each other. In a case where the Abbe number of the d-line reference of the positive lens is denoted by vp, the Abbe number of the d-line reference of the negative lens is denoted by vn, the refractive index of the negative lens with respect to the d-line is denoted by Nn, the temperature coefficient of the refractive index of the negative lens with respect to the d-line at 25°C is denoted by (dNn / dT) x 10, and the unit of dNn / dT is °C -1 , the zoom lens satisfies the following conditional expressions (1), (2), and (3).

[0010] -1.5 < dNn / dT < 3 (1)

[0011] 0 < Nn + 0.0105 x Vn - 2.2188 < 0.15 (2)

[0012] 1.5 < Vp / Vn < 2.5 (3)

[0013] Further, in the zoom lens according to the second aspect, it is preferable that at least one of the following conditional expression (1-1), conditional expression (2-1), and conditional expression (3-1) be satisfied.

[0014] -0.5 < dNn / dT < 2 (1-1)

[0015] 0 < Nn + 0.0105 x Vn - 2.2188 < 0.1 (2-1)

[0016] 1.7 < Vp / Vn < 2.3 (3-1)

[0017] Further, in the zoom lens according to the second aspect, it is preferable that at least one of the following conditional expression (4) and conditional expression (5), and more preferable that at least one of the following conditional expression (4-1) and conditional expression (5-1) be satisfied.

[0018] 1.68 < Nn < 1.88 (4)

[0019] 1.71 < Nn < 1.85 (4-1)

[0020] 30 < Vn < 50 (5)

[0021] 33 < Vn < 48 (5-1)

[0022] Further, in the zoom lens according to the second aspect, in a case where a focal length of the positive lens is fp, a focal length of the negative lens is fn, a temperature coefficient of the refractive index of the positive lens with respect to the d line at 25°C is (dNp / dT) x 10, units of fp and fn are mm, and a unit of dNp / dT is °C -1 , it is preferable that the following conditional expression (6) be satisfied, and more preferable that the following conditional expression (6-1) be satisfied.

[0023] -0.2 < (dNp / dT) / fp + (dNn / dT) / fn < 0.2 (6)

[0024] -0.15 < (dNp / dT) / fp + (dNn / dT) / fn < 0.15 (6-1)

[0025] Further, in the zoom lens according to the second aspect, in a case where a partial dispersion ratio between the g line and the F line of the positive lens is θgFp and a partial dispersion ratio between the g line and the F line of the negative lens is θgFn, it is preferable to satisfy the following conditional expression (7), and more preferable to satisfy the following conditional expression (7-1).

[0026] 0 < θgFn- θgFp < 0.07 (7)

[0027] 0.01 < θgFn- θgFp < 0.06 (7-1)

[0028] Further, in the zoom lens according to the first aspect and the second aspect, in a case where an average value of Abbe numbers on the d line basis for all the positive lenses included in the intermediate lens group and the final lens group is νpave and an average value of Abbe numbers on the d line basis for all the negative lenses included in the intermediate lens group and the final lens group is νnave, it is preferable to satisfy the following conditional expression (8), and more preferable to satisfy the following conditional expression (8-1).

[0029] 1 < νpave / νnave < 1.85 (8)

[0030] 1 < νpave / νnave < 1.8 (8-1)

[0031] Further, in the zoom lens according to the first aspect and the second aspect, it is preferable that the first lens group be fixed with respect to the image plane at the time of zooming.

[0032] Further, in the zoom lens according to the first aspect and the second aspect, it is preferable that the final lens group be fixed with respect to the image plane at the time of zooming.

[0033] Further, in the zoom lens according to the first aspect and the second aspect, in a case where a focal length of the zoom lens at the wide-angle end in a state where focusing is performed on an object at infinity is fw and a focal length of the first lens group is f1, it is preferable to satisfy the following conditional expression (9).

[0034] 0.3 < fw / f1 < 0.55 (9)

[0035] Further, in the zoom lens according to the first aspect and the second aspect, it can be a zoom lens in which the intermediate lens group sequentially includes, from the object side toward the image side, a third lens group having positive refractive power and a fourth lens group having positive refractive power.

[0036] Further, in the zoom lens according to the first aspect and the second aspect, it can be a zoom lens in which the intermediate lens group sequentially includes, from the object side toward the image side, a third lens group having negative refractive power and a fourth lens group having positive refractive power.

[0037] In addition, the terms "including" and "including" in this specification mean 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, imaging elements and hand shaking correction mechanisms.

[0038] Furthermore, in this specification, "a group with positive refractive power" means 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. "Lens group" is not limited to a structure including multiple lenses; it can also be a structure including only one lens. Moreover, regarding "one lens group," a lens group whose interval in the optical axis direction changes during zooming is defined as "one lens group." That is, when dividing the lens group by an interval that changes during zooming, the lens group included in one division is defined as one lens group.

[0039] The terms "lens with positive refractive power," "positive lens," and "positive lens" have the same meaning. The terms "lens with negative refractive power," "negative lens," and "negative lens" have the same meaning. A compound aspherical lens (a lens in which a spherical lens and an aspherical film formed on the spherical lens are integrated to function as a single aspherical lens) is used as a single lens and not considered a combined lens. Unless otherwise stated, the sign of refractive power and the surface shape of the lens surface associated with lenses including aspherical surfaces are assumed to be considered in the paraxial region.

[0040] The "focal length" used in each conditional expression is the paraxial focal length. The values ​​used in each conditional expression, except for the partial dispersion ratio, are values ​​with the d-line as the reference when focusing on an object at infinity. Regarding the partial dispersion ratio θgF between the g-line and F-line of a certain lens, it is defined as θgF = (Ng - NF) / (NF - NC), assuming the refractive indices of the lens relative to the g-line, F-line, and C-line are Ng, NF, and NC, respectively.

[0041] The “C line”, “d line”, “F line” and “g line” described in this specification are bright lines. The wavelength of the C line is 656.27 nm, the wavelength of the d line is 587.56 nm, the wavelength of the F line is 486.13 nm, and the wavelength of the g line is 435.84 nm.

[0042] Invention Effects

[0043] According to the present invention, a small zoom lens with good optical performance and a camera device having the zoom lens can be provided. Attached Figure Description

[0044] Figure 1is a diagram showing a sectional view and a movement locus of a structure of a zoom lens corresponding to the zoom lens of Example 1 and a zoom lens to which an embodiment of the present application is applied.

[0045] Figure 2 is a sectional view showing a structure and a light flux of the zoom lens of Example 1.

[0046] Figure 3 is a graph of each aberration of the zoom lens of Example 1.

[0047] Figure 4 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 2.

[0048] Figure 5 is a graph of each aberration of the zoom lens of Example 2.

[0049] Figure 6 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 3.

[0050] Figure 7 is a graph of each aberration of the zoom lens of Example 3.

[0051] Figure 8 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 4.

[0052] Figure 9 is a graph of each aberration of the zoom lens of Example 4.

[0053] Figure 10 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 5.

[0054] Figure 11 is a graph of each aberration of the zoom lens of Example 5.

[0055] Figure 12 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 6.

[0056] Figure 13 is a graph of each aberration of the zoom lens of Example 6.

[0057] Figure 14 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 7.

[0058] Figure 15 is a graph of each aberration of the zoom lens of Example 7.

[0059] Figure 16 is a diagram showing a sectional view and a movement locus of a structure of a zoom lens of Example 8.

[0060] Figure 17are aberration diagrams of the zoom lens of Example 8.

[0061] Figure 18 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 9.

[0062] Figure 19 are aberration diagrams of the zoom lens of Example 9.

[0063] Figure 20 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 10.

[0064] Figure 21 are aberration diagrams of the zoom lens of Example 10.

[0065] Figure 22 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 11.

[0066] Figure 23 are aberration diagrams of the zoom lens of Example 11.

[0067] Figure 24 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 12.

[0068] Figure 25 are aberration diagrams of the zoom lens of Example 12.

[0069] Figure 26 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 13.

[0070] Figure 27 are aberration diagrams of the zoom lens of Example 13.

[0071] Figure 28 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 14.

[0072] Figure 29 are aberration diagrams of the zoom lens of Example 14.

[0073] Figure 30 are a sectional view and a moving locus diagram showing the structure of the zoom lens of Example 15.

[0074] Figure 31 are aberration diagrams of the zoom lens of Example 15.

[0075] Figure 32 is a schematic configuration diagram of an image pickup apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0076] Hereinafter, each embodiment of the present application will be described in detail with reference to the drawings.

[0077] First, reference will be made to Figure 1 and Figure 2 The structure of the zoom lens according to the first embodiment of the present application will be described. Figure 1 is a sectional view showing the structure and moving locus of the zoom lens according to an embodiment of the present application. Figure 2 is a sectional view showing the lens structure and light beams in each state of the zoom lens. Figure 1 and Figure 2 The example shown in the drawing corresponds to the zoom lens of Embodiment 1 described later. In Figure 1 and Figure 2 the state of focusing on an infinite distance object is shown, and the left side is the object side and the right side is the image side. In Figure 1 the wide-angle end state is shown. In Figure 2 in the upper section marked "wide-angle end" the wide-angle end state is shown, and in the lower section marked "telephoto end" the telephoto end state is shown. In Figure 2 the on-axis light beam wa in the wide-angle end state and the light beams wb of the maximum angle of view, and the on-axis light beam ta in the telephoto end state and the light beams tb of the maximum angle of view are shown as light beams.

[0078] Further, in Figure 1 and Figure 2 an example is shown in which the zoom lens is applied to an imaging device, and an optical member PP whose incident surface and exit surface are parallel is disposed between the zoom lens and the image plane Sim. The optical member PP is a member such as various filters, prisms, and / or cover glasses, etc. The various filters are, for example, low-pass filters, infrared cut filters, and filters that cut a specific wavelength region, etc. The optical member PP is a member that does not have a refractive power, and the structure in which the optical member PP is omitted is also possible. Hereinafter, the description will be made mainly with reference to Figure 1

[0079] The zoom lens according to the present embodiment sequentially includes a first lens group G1, a second lens group G2, an intermediate lens group Gm, and a final lens group Gs from the object side to the image side. The first lens group G1 is a lens group having a positive refractive power. The second lens group G2 is a lens group having a negative refractive power. The intermediate lens group Gm includes one or two lens groups. The final lens group Gs is a lens group having a positive refractive power. In the zoom lens according to the present embodiment, at the time of zooming, the second lens group G2 moves along the optical axis, and the interval of the adjacent lens groups is changed.

[0080] ​The first lens group G1, located closest to the object, has positive refractive power, which shortens the overall length of the lens system, thus facilitating miniaturization. The second lens group G2, which moves with zoom and has negative refractive power, can be corrected for focus position changes caused by zooming via the intermediate lens group Gm. When the intermediate lens group Gm comprises a single lens group, the zoom mechanism is simplified, thus contributing to weight reduction. When the intermediate lens group Gm comprises two lens groups, it becomes a floating mechanism that allows relative movement between the two lens groups, thus effectively correcting for changes in image plane curvature and spherical aberration during zooming. The final lens group Gs, located closest to the image, has positive refractive power, which suppresses the increase in the incident angle of the principal ray of off-axis beams towards the image plane Sim, thus helping to suppress shading.

[0081] Figure 1 The zoom lens in the example shown includes, along the optical axis Z from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. An aperture St is located closest to the object side in the fourth lens group G4. Furthermore, Figure 1 The aperture value St shown does not represent the shape, but rather the position along the optical axis. Figure 1 In the example shown, the group including the third lens group G3 and the fourth lens group G4 corresponds to the intermediate lens group Gm, and the fifth lens group G5 corresponds to the final lens group Gs.

[0082] exist Figure 1 In the zoom lens example shown, during zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from the adjacent groups and move along the optical axis Z. That is, the third lens group G3 and the fourth lens group G4, which are the two lens groups included in the intermediate lens group Gm, move along the optical axis Z along different trajectories during zooming. Figure 1 In the image, arrows below the moving lens groups during zooming schematically show the movement trajectory of each lens group as zooming from the wide-angle end to the telephoto end.

[0083] exist Figure 1 In the zoom lens of the example shown, the first lens group G1 includes 10 lenses L1a to L1j sequentially from the object side to the image side. The second lens group G2 includes 5 lenses L2a to L2e sequentially from the object side to the image side. The third lens group G3 includes 1 lens L3a. The fourth lens group G4 includes 3 lenses L4a to L4c sequentially from the object side to the image side. The fifth lens group G5 includes 9 lenses L5a to L5i sequentially from the object side to the image side.

[0084] Further, in the zoom lens of the present application, the number of lenses constituting each lens group and the position of the aperture stop St can also be different from the example shown in Fig. 1. Figure 1

[0085] In the zoom lens according to the present embodiment, at least one of the intermediate lens group Gm and the final lens group Gs includes a pair of positive and negative lenses Lp and Ln disposed adjacent to each other. Here, the "pair of positive and negative lenses Lp and Ln" means a group of a positive lens and a negative lens disposed adjacent to each other and the surface interval on the optical axis between the respective lenses is smaller than and the same as the surface interval on the optical axis of the other adjacent lens, respectively. The "pair of positive and negative lenses Lp and Ln" also includes a cemented lens. Further, the positive lens Lp and the negative lens Ln are included in the same lens group, and no other constituent element such as an aperture stop St is included between the positive lens Lp and the negative lens Ln.

[0086] In a case where the Abbe number of the d-line reference of the positive lens Lp is set to vp, the Abbe number of the d-line reference of the negative lens Ln is set to vn, the refractive index of the negative lens Ln with respect to the d-line is set to Nn, the temperature coefficient of the refractive index of the negative lens Ln with respect to the d-line at 25°C is set to (dNn / dT)xlO -6 -1 , and the unit of dNn / dT is set to °C, the positive lens Lp and the negative lens Ln satisfy the following conditional expression (1), conditional expression (2), and conditional expression (3).

[0087] -1.5 < dNn / dT < 3 (1)

[0088] 0 < Nn + 0.0105 x vn - 2.2188 < 0.15 (2)

[0089] 1.5 < vp / vn < 2.5 (3)

[0090] By making it not less than the lower limit of conditional expression (1), a material with a high refractive index or a material with an appropriate Abbe number can be selected as the negative lens Ln, and thus it is possible to prevent the absolute value of the curvature from becoming large, and thereby it is easy to suppress the occurrence of various aberrations including chromatic aberration. Further, it is possible to prevent the thickness of the peripheral portion of the negative lens Ln in the optical axis direction from becoming too large, and thereby it is advantageous for downsizing. By making it not more than the upper limit of conditional expression (1), it is possible to suppress the variation in the focusing position upon temperature change. For example, in an optical system like the zoom lens according to the present embodiment, when the temperature rises, the focusing position generally tends to move toward the image side. By making it not more than the upper limit of expression (1), it is possible to suppress the movement of the focusing position toward the image side upon temperature rise. Further, if it is configured to satisfy the following conditional expression (1-1), even better characteristics can be obtained.

[0091] -0.5 < dNn / dT < 2 (1-1)​​

[0092] By making it not be lower than the lower limit of conditional expression (2), a material with a high refractive index or a material with a proper Abbe number can be selected as the negative lens Ln, so the absolute value of the curvature can be prevented from becoming large, thereby easily suppressing the occurrence of various aberrations including chromatic aberration. Also, the thickness of the peripheral portion of the negative lens Ln in the optical axis direction can be prevented from becoming excessively large, thereby contributing to miniaturization. By making it not be higher than the upper limit of conditional expression (2), the absolute value of the curvature of the negative lens Ln does not become small, thereby contributing to correction of chromatic aberration. Also, a material with a proper Abbe number can be selected, so it is easy to correct chromatic aberration. In addition, if the structure is set to satisfy the following conditional expression (2-1), more favorable characteristics can be obtained.

[0093] 0 < Nn + 0.0105 x Vn - 2.2188 < 0.1 (2-1)

[0094] By satisfying conditional expression (3), on-axis chromatic aberration can be properly corrected, thereby easily correcting on-axis chromatic aberration and magnification chromatic aberration. In addition, if the structure is set to satisfy the following conditional expression (3-1), more favorable characteristics can be obtained.

[0095] 1.7 < Vp / Vn < 2.3 (3-1)

[0096] For example, in the zoom lens of the example shown in FIG. 1, the lens L5f corresponds to the positive lens Lp, and the lens L5g corresponds to the negative lens Ln. Also, in the zoom lens related to the present embodiment, the positive lens Lp and the negative lens Ln can be set to be different from the example shown in FIG. 1. Figure 1 Figure 1

[0097] Also, in the zoom lens related to the present embodiment, the negative lens Ln preferably satisfies the following conditional expression (4). By making it not be lower than the lower limit of conditional expression (4), a material with a high refractive index can be selected, so the absolute value of the curvature can be prevented from becoming large, thereby easily suppressing the occurrence of various aberrations including chromatic aberration. Also, the thickness of the peripheral portion of the negative lens Ln in the optical axis direction can be prevented from becoming excessively large, thereby contributing to miniaturization. By making it not be higher than the upper limit of conditional expression (4), a material with a proper Abbe number can be selected, so the occurrence of magnification chromatic aberration can be easily suppressed. In addition, if the structure is set to satisfy the following conditional expression (4-1), more favorable characteristics can be obtained.

[0098] 1.68 < Nn < 1.88 (4)

[0099] 1.71 < Nn < 1.85 (4-1)

[0100] ​​Further, in the zoom lens according to the present embodiment, the negative lens Ln preferably satisfies the following conditional expression (5). By making it not less than the lower limit of the conditional expression (5), it is easy to suppress the occurrence of chromatic aberration. By making it not more than the upper limit of the conditional expression (5), it is possible to select a material with a high refractive index, and thus it is possible to prevent the absolute value of the curvature from becoming large, and thus it is easy to suppress the occurrence of various aberrations including chromatic aberration. Further, it is possible to prevent the thickness of the periphery of the negative lens Ln in the optical axis direction from becoming too large, and thus it is advantageous for size reduction. In addition, if the structure is such that the following conditional expression (5-1) is satisfied, even better characteristics can be obtained.

[0101] 30 < νn < 50 (5)

[0102] 33 < νn < 48 (5-1)

[0103] Further, in the zoom lens according to the present embodiment, in a case where the focal length of the positive lens Lp is fp, the focal length of the negative lens Ln is fn, the temperature coefficient of the refractive index of the positive lens Lp with respect to the d line at 25°C is (dNp / dT) x 10 -6 , the units of fp and fn are mm (millimeters), and the unit of dNp / dT is °C -1 , the positive lens Lp and the negative lens Ln preferably satisfy the following conditional expression (6). By making it not less than the lower limit of the conditional expression (6), it is possible to suppress the variation in the focus position at the time of temperature change. For example, in an optical system like the zoom lens according to the present embodiment, when the temperature rises, the focus position generally tends to move toward the image side. By making it not more than the upper limit of the conditional expression (6), it is possible to suppress the movement of the focus position toward the image side at the time of temperature rise. By making it not more than the upper limit of the conditional expression (6), it is possible to make the positive lens Lp have an appropriate refractive power, and thus it is easy to correct the on-axis chromatic aberration. Further, it is possible to select a material with an appropriate refractive index and Abbe number as the negative lens Ln, and thus it is possible to suppress the occurrence of various aberrations. In addition, if the structure is such that the following conditional expression (6-1) is satisfied, even better characteristics can be obtained.

[0104] -0.2 < (dNp / dT) / fp + (dNn / dT) / fn < 0.2 (6)

[0105] -0.15 < (dNp / dT) / fp + (dNn / dT) / fn < 0.15 (6-1)

[0106] Furthermore, in the zoom lens according to this embodiment, when the partial dispersion ratio between the g-line and F-line of the positive lens Lp is set to θgFp and the partial dispersion ratio between the g-line and F-line of the negative lens Ln is set to θgFn, the positive lens Lp and the negative lens Ln preferably satisfy the following conditional expression (7). By ensuring that they are not below the lower limit of conditional expression (7), a material with an appropriate Abbe number can be selected, thereby making it easy to correct primary axial chromatic aberration. By ensuring that they are not above the upper limit of conditional expression (7), secondary axial chromatic aberration can be easily corrected. In addition, if the structure is configured to satisfy the following conditional expression (7-1), even better characteristics can be obtained.

[0107] 0<θgFn-θgFp<0.07 (7)

[0108] 0.01<θgFn-θgFp<0.06 (7-1)

[0109] Next, refer to Figure 1 The structure of the zoom lens according to the second embodiment of the present invention will be described. Figure 1 The illustrated method and structure of the zoom lens are as described above, therefore, some repetitive descriptions are omitted here. The zoom lens according to this embodiment includes, from the object side to the image side, a first lens group G1, a second lens group G2, an intermediate lens group Gm, and a final lens group Gs. The first lens group G1 is a lens group with positive refractive power. The second lens group G2 is a lens group with negative refractive power. The intermediate lens group Gm includes one or two lens groups. In the zoom lens according to this embodiment, during zooming, the second lens group G2 moves along the optical axis, and the spacing between adjacent lens groups changes.

[0110] The first lens group G1, located closest to the object, has positive refractive power, which shortens the overall length of the lens system, thus facilitating miniaturization. The second lens group G2, which moves with magnification and has negative refractive power, can have its focus position shifted by the intermediate lens group Gm corrected for magnification changes. When the intermediate lens group Gm comprises a single lens group, the zoom mechanism is simplified, thus contributing to weight reduction. When the intermediate lens group Gm comprises two lens groups, it becomes a floating mechanism that allows relative movement between the two lens groups, thus effectively correcting for image plane curvature and spherical aberration changes during zooming.

[0111] Next, preferred and possible structures commonly used in the zoom lenses according to the first and second embodiments of the present invention will be described.

[0112] In the zoom lenses described in each embodiment, it is preferable that the first lens group G1 is fixed relative to the image plane during zooming. Figure 1In the zoom lens of the illustrated example, the first lens group G1 is fixed with respect to the image plane Sim at the time of zooming. By fixing the largest outermost first lens group G1 with respect to the image plane Sim, the variation of the center of gravity of the zoom lens caused by zooming can be reduced, and thus the convenience at the time of shooting can be improved.

[0113] Also, in the zoom lens according to each embodiment, it is preferable that the final lens group Gs be fixed with respect to the image plane at the time of zooming. In Figure 1 In the zoom lens of the illustrated example, the fifth lens group G5 corresponding to the final lens group Gs is fixed with respect to the image plane Sim at the time of zooming. Since there are many components such as communication contacts and a bayonet mechanism of the camera body that should be disposed in the vicinity of the final lens group Gs on the most image side, fixing the final lens group Gs at the time of zooming without a moving mechanism for the final lens group Gs is advantageous for miniaturization and weight reduction.

[0114] Also, in the zoom lens according to each embodiment, as the intermediate lens group Gm, for example, the following structure can be adopted. It can be configured such that the intermediate lens group Gm includes, in order from the object side toward the image side, a third lens group G3 having positive refractive power and a fourth lens group G4 having positive refractive power. In this case, by the third lens group G3 having positive refractive power, the height of the light beam incident to the fourth lens group G4 in the radial direction can be suppressed to be low, and thus miniaturization is facilitated.

[0115] Alternatively, it can be configured such that the intermediate lens group Gm includes, in order from the object side toward the image side, a third lens group G3 having negative refractive power and a fourth lens group G4 having positive refractive power. In this case, the third lens group G3 can also take over the zooming function together with the second lens group G2, and thus the variation of various aberrations at the time of zooming can be easily suppressed, and high magnification is facilitated.

[0116] Also, in the zoom lens according to each embodiment, in a case where the average value of the Abbe number at the d-line reference for all positive lenses included in the intermediate lens group Gm and the final lens group Gs is set as vpave and the average value of the Abbe number at the d-line reference for all negative lenses included in the intermediate lens group Gm and the final lens group Gs is set as vnave, it is preferable that the following conditional expression (8) be satisfied. By satisfying the conditional expression (8), the on-axis chromatic aberration can be appropriately corrected, and thus the on-axis chromatic aberration and the magnification chromatic aberration can be easily corrected. In addition, if the structure is set to satisfy the following conditional expression (8-1), even better characteristics can be obtained.

[0117] 1 < vpave / vnave < 1.85 (8)

[0118] 1 < vpave / vnave < 1.8 (8-1)

[0119] Furthermore, in the zoom lenses described in each embodiment, when the focal length of the wide-angle zoom lens is set to fw and the focal length of the first lens group G1 is set to f1, it is preferable to satisfy the following conditional expression (9). By ensuring that it does not fall below the lower limit of conditional expression (9), the overall length of the lens system can be prevented from increasing. By ensuring that it does not fall above the upper limit of conditional expression (9), the shortening of the focal length of the first lens group G1 can be prevented, that is, the shortening of the back focal length of the first lens group G1 when approximating the first lens group G1 with a thin lens can be prevented. As a result, it is easy to extend the range of movement of the second lens group G2 during zoom, thereby easily ensuring the necessary magnification. In addition, if the structure is configured to satisfy the following conditional expression (9-1), even better characteristics can be obtained.

[0120] 0.3 < fw / f1 < 0.55 (9)

[0121] 0.4 < fw / f1 < 0.55 (9-1)

[0122] The preferred and possible structures in the above embodiments can be combined in any way, and are preferably adopted selectively and appropriately according to the required specifications.

[0123] Next, a numerical embodiment of the zoom lens of the present invention will be described.

[0124] [Example 1]

[0125] A cross-sectional view showing the structure of the zoom lens of Embodiment 1 is shown. Wide angle end The illustrated method and structure are as described above, therefore some repetitive descriptions are omitted here. The basic lens data of the zoom lens of Example 1 is shown in Tables 1A and 1B, the specifications and variable surface spacing are shown in Table 2, and the aspherical coefficients are shown in Table 3. Furthermore, to avoid making a single table too long, Tables 1A and 1B display the basic lens data in two separate tables.

[0126] In Tables 1A and 1B, the Sn column shows the surface numbering when the surface closest to the object side is designated as surface 1 and the numbering increases sequentially towards the image side; the R column shows the radius of curvature of each surface; and the D column shows the surface spacing along the optical axis between each surface and its image-side adjacent surface. Furthermore, 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 θgF column shows the partial dispersion ratio between the g-line and F-line of each component; and the dN / dT column shows the temperature coefficient (×10) of the refractive index of each component relative to the d-line at 25°C. -6). As to the lenses, the material name and the name of the manufacturing company of each lens are shown in the material name column with a comma between the material name and the name of the manufacturing company. The name of the manufacturing company is shown in outline. "OHARA" is OHARA INC., "HOYA" is HOYA CORPORATION, "HIKARI" is HIKARI GLASS Co., Ltd, "SUMITA" is SUMITA OPTICAL GLASS, INC., "SCHOTT" is SCHOTT, and "CDGM" is Chengdu Optics & Electronics Technology Co., Ltd.

[0127] In Tables 1A and 1B, the sign of the radius of curvature of the surface of the shape on the object side of the convex surface is made positive and the sign of the radius of curvature of the surface of the shape on the image side of the convex surface is made negative. In Table 1B, the aperture stop St and the optical member PP are also shown, and in the surface number column of the surface corresponding to the aperture stop St, the surface number and the term (St) are written. The value of the lowermost column of D in Table 1B is the interval between the most image-side surface in the table and the image plane Sim. In Tables 1A and 1B, as to the variable surface interval at the time of zooming, the notation DD[] is used, and the object-side surface number of the interval is noted in the [] and written in the D column.

[0128] In Table 2, the values of the magnification Zr of zooming, the focal length f of the zoom lens, the back focal length Bf of the zoom lens in terms of air conversion distance, the F number FNo., the maximum total angle of view 2ω, and the variable surface interval are shown in terms of the d-line reference. (°) in the 2ω column indicates the unit in degrees. In Table 2, the values of the wide-angle end state and the telephoto end state are shown in the column marked wide-angle end and telephoto end, respectively.

[0129] In Tables 1A and 1B, the surface number of the aspheric surface is noted with the * notation, and the numerical value of the curvature radius of the paraxial portion is written in the curvature radius column of the aspheric surface. In Table 3, the surface number of the aspheric surface is shown in the Sn column, and the numerical value of the aspheric coefficient with respect to each aspheric surface is shown in the KA and Am (m is an integer of 4 or more) columns. "E±n" (n: integer) of the numerical value of the aspheric coefficient in Table 3 indicates "x 10 ±n ". KA and Am are aspheric coefficients in the aspheric expression represented by the following formula.

[0130] Zd = C x h 2 / {1 + (1 - KA x C 2 x h 2 ) 1 / 2} + ∑Am x h m

[0131] wherein,

[0132] Zd: aspherical depth (length of a perpendicular from a point on the aspherical surface at height h to a plane tangent to the aspherical surface vertex and perpendicular to the optical axis);

[0133] h: height (distance from the optical axis to the lens surface);

[0134] C: reciprocal of the paraxial curvature radius;

[0135] KA, Am: aspherical coefficients,

[0136] The aspherical formula ∑ indicates a sum related to m.

[0137] In the data of each table, degrees are used as the unit of angle and mm (millimeters) are used as the unit of length. The optical system can be used in either a magnification ratio or a reduction ratio, and thus other appropriate units can also be used. Also, in each table shown below, values rounded to a prescribed number of digits are described.

[0138] [Table 1A]

[0139] Example 1

[0140]

[0141] [Table 1B]

[0142] Example 1

[0143]

[0144] [Table 2]

[0145] Example 1

[0146] Telephoto end Bf Zr 1.0 2.3 f 19.699 44.933 FNo. 37.885 37.885 2ω (°) 2.74 2.75 DD

[18] 100.8 53.0 DD

[27] 1.320 48.072 DD

[29] 7.572 1.024 DD

[35] 21.360 1.034 Sn 23.229 3.351

[0147] [Table 3]

[0148] Example 1

[0149] KA 1 3 13 31 Figure 3 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.1453055E-06 -6.2292685E-06 -8.8331424E-07 -3.8866746E-07 A6 -1.0228643E-08 1.1380002E-09 -1.5311922E-09 -6.2132119E-09 A8 1.4833718E-11 1.1596949E-11 1.1135019E-11 9.4593513E-11 A10 -1.7132642E-14 -6.9992956E-14 -4.3499458E-14 -8.4975698E-13 A12 1.4454906E-17 2.3319602E-16 1.0645589E-16 4.7441598E-15 A14 -8.2060433E-21 -4.7046712E-19 -1.6532631E-19 -16.524608E-17 A16 2.8860167E-24 5.6853457E-22 1.5767664E-22 3.4707444E-20 A18 -5.4203712E-28 -3.7863416E-25 -8.4052923E-26 -3.9767082E-23 A20 3.6831493E-32 1.0705391E-28 1.9133485E-29 1.8715413E-26

[0150] In Figure 3 each aberration graph of the state in which the zoom lens of Example 1 is focused on an infinite distance object is shown. In Figure 3 each graph, from the left, a spherical aberration, an astigmatism, a distortion aberration, and a magnification chromatic aberration are shown in order. In Figure 4In the upper section marked with wide-angle end, a graph of the wide-angle end state is shown, and in the lower section marked with telephoto end, a graph of the telephoto end state is shown. In the spherical aberration graph, the aberration under the d line, the C line, the F line, and the g line is indicated by a solid line, a long dashed line, a short dashed line, and a two-dot chain line, respectively. In the astigmatism graph, the aberration under the d line in the sagittal direction is indicated by a solid line, and the aberration under the d line in the tangential direction is indicated by a short dashed line. In the distortion aberration graph, the aberration under the d line is indicated by a solid line. In the lateral chromatic aberration graph, the aberration under the C line, the F line, and the g line is indicated by a long dashed line, a short dashed line, and a two-dot chain line, respectively. The FNo. of the spherical aberration graph indicates the F value, and ω of the other aberration graphs indicates the half viewing angle.

[0151] Unless otherwise specified, the symbols, meanings, methods of recording, and methods of illustrating of the respective data related to the above-described Embodiment 1 are also the same in the following embodiments, and thus the repeated explanation is omitted below.

[0152] [Embodiment 2]

[0153] A sectional view showing the structure of the zoom lens of Embodiment 2 is shown in Figure 5 In Embodiment 2, the zoom lens includes, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed with respect to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 move along the optical axis Z by changing the interval with the adjacent group, respectively.

[0154] The first lens group G1 includes, in order from the object side to the image side, ten lenses L1a to L1j. The second lens group G2 includes, in order from the object side to the image side, five lenses L2a to L2e. The third lens group G3 includes one lens L3a. The fourth lens group G4 includes, in order from the object side to the image side, an aperture stop St, and three lenses L4a to L4c. The fifth lens group G5 includes, in order from the object side to the image side, nine lenses L5a to L5i. The lens L5f corresponds to the positive lens Lp, and the lens L5g corresponds to the negative lens Ln.

[0155] The basic lens data of the zoom lens of Embodiment 2 is shown in Tables 4A and 4B, the specifications and variable face intervals are shown in Table 5, and the respective aberration graphs of the state in which the focus is on an infinite object are shown in Wide angle end

[0156] [Table 4A]

[0157] Embodiment 2​

[0158]

[0159] [Table 4B]

[0160] Example 2

[0161]

[0162] [Table 5]

[0163] Example 2

[0164] Telephoto end Bf Zr 1.0 2.3 f 19.702 44.940 FNo. 38.927 38.927 2ω (°) 2.75 2.76 DD

[18] 100.8 53.0 DD

[27] 1.001 49.162 DD

[29] 8.587 1.413 DD

[35] 22.678 2.124 Sn 21.893 1.460

[0165] [Table 6]

[0166] Example 2

[0167] KA 1 3 13 31 Figure 6 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.2863147E-06 -6.5000422E-06 8.0440060E-07 -3.8924522E-08 A6 -1.0699488E-08 4.7883935E-10 -7.2410300E-10 -5.9778820E-09 A8 1.6156135E-11 1.7740304E-11 6.1578322E-12 1.2824965E-10 A10 -2.0288522E-14 -9.8219200E-14 -2.6690745E-14 -1.5021133E-12 A12 1.9529821E-17 3.1507628E-16 7.2248068E-17 1.0629716E-14 A14 -1.3355445E-20 -6.2534112E-19 -1.2195944E-19 -4.6388259E-17 A16 6.0629404E-24 7.4961653E-22 1.2377697E-22 1.2223547E-19 A18 -1.6300995E-27 -4.9754483E-25 -6.8884444E-26 -1.7838289E-22 A20 1.9659586E-31 1.4036586E-28 1.6118994E-29 1.1073111E-25

[0168] [Example 3]

[0169] A cross-sectional view showing the structure of the zoom lens of Embodiment 3 is shown in Figure 7 In Embodiment 3, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0170] Lens group G1 consists of 10 lenses, L1a to L1j, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 1 lens, L3a. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side. Lens L5f corresponds to the positive lens Lp, and lens L5g corresponds to the negative lens Ln.

[0171] The basic lens data of the zoom lens of Example 3 are shown in Tables 7A and 7B, the specifications and variable surface spacing are shown in Table 8, the aspherical coefficients are shown in Table 9, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 7B. Wide angle end middle.

[0172] [Table 7A]

[0173] Example 3

[0174]

[0175] [Table 7B]

[0176] Example 3

[0177]

[0178] [Table 8]

[0179] Example 3

[0180] Telephoto end Bf Zr 1.0 2.3 f 19.684 44.898 FNo. 36.883 36.883 2ω (°) 2.75 2.77 DD

[18] 101.0 52.8 DD

[27] 0.798 48.629 DD

[29] 9.152 1.401 DD

[35] 21.675 2.345 Sn 24.053 3.303

[0181] [Table 9]

[0182] Example 3

[0183] KA 1 3 13 31 Figure 8 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 1.1880252E-05 -1.0452156E-05 9.8958006E-07 -2.2285556E-07 A6 -1.9668012E-08 3.6155693E-09 -1.8146852E-09 -6.6646743E-09 A8 3.6586403E-11 9.0808884E-12 1.5145789E-11 1.1721480E-10 A10 -5.5843200E-14 -7.2749550E-14 -6.8205481E-14 -1.1591793E-12 A12 6.4541929E-17 2.2973603E-16 1.8887672E-16 7.1173537E-15 A14 -5.2499889E-20 -4.2884944E-19 -3.2546273E-19 -2.7569827E-17 A16 2.8054580E-23 4.7958995E-22 3.3852471E-22 6.5702324E-20 A18 -8.7764479E-27 -2.9782356E-25 -1.9410024E-25 -8.8055050E-23 A20 1.2185990E-30 7.9072393E-29 4.7022443E-29 5.0830598E-26

[0184] [Example 4]

[0185] A cross-sectional view showing the structure of the zoom lens of Embodiment 4 is shown in Figure 9 In Example 4, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0186] Lens group G1 consists of 10 lenses, L1a to L1j, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 1 lens, L3a. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side. Lens L5f corresponds to the positive lens Lp, and lens L5g corresponds to the negative lens Ln.

[0187] The basic lens data of the zoom lens of Example 4 are shown in Tables 10A and 10B, the specifications and variable surface spacing are shown in Table 11, the aspherical coefficients are shown in Table 12, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 10B.Wide angle end In the following, the present application will be described in more detail.

[0188] [Table 10A]

[0189] Example 4

[0190]

[0191] [Table 10B]

[0192] Example 4

[0193]

[0194] [Table 11]

[0195] Example 4

[0196] Telephoto end Bf Zr 1.0 2.3 f 19.700 44.935 FNo. 41.027 41.027 2ω (°) 2.75 2.77 DD

[18] 100.8 52.8 DD

[27] 1.000 49.187 DD

[29] 9.536 1.372 DD

[35] 21.607 1.597 Sn 23.869 3.856

[0197] [Table 12]

[0198] Example 4

[0199] KA 1 3 13 31 Figure 10 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 1.1713826E-05 -1.0318995E-05 9.9272069E-07 2.9456156E-07 A6 -1.8252967E-08 4.2167987E-09 -1.3394921E-09 -2.8151784E-09 A8 3.0617721E-11 -7.8467627E-13 1.0203532E-11 3.9909586E-11 A10 -4.0274352E-14 -2.2267460E-14 -4.2811471E-14 -3.0538747E-13 A12 3.8933298E-17 8.7592090E-17 1.1413703E-16 1.3238478E-15 A14 -2.5956461E-20 -1.9182453E-19 -1.9413381E-19 -2.8131347E-18 A16 1.1304742E-23 2.4833873E-22 2.0254627E-22 8.6426203E-22 A18 -2.9175422E-27 -1.7593595E-25 -1.1762974E-25 6.8820271E-24 A20 3.4917329E-31 5.2235596E-29 2.9021507E-29 -8.6435985E-27

[0200] [Example 5]

[0201] A sectional view showing the structure of the zoom lens of Example 5 is shown in Figure 11 The zoom lens of Example 5 includes, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. An intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. A final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed with respect to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 respectively change the interval from the adjacent group and move along the optical axis Z.

[0202] The first lens group G1 includes, in order from the object side to the image side, ten lenses L1a to L1j. The second lens group G2 includes, in order from the object side to the image side, five lenses L2a to L2e. The third lens group G3 includes one lens L3a. The fourth lens group G4 includes, in order from the object side to the image side, an aperture stop St, and three lenses L4a to L4c. The fifth lens group G5 includes, in order from the object side to the image side, nine lenses L5a to L5i. The lens L5f corresponds to a positive lens Lp, and the lens L5g corresponds to a negative lens Ln.

[0203] The basic lens data of the zoom lens of Example 5 is shown in Table 13A and Table 13B, the specifications and variable surface intervals are shown in Table 14, the aspheric coefficients are shown in Table 15, the aberration diagrams of the state of focusing on an infinite object are shown in Wide angle end Figs. 13A and 13B.

[0204] [Table 13A]

[0205] Example 5

[0206]

[0207] [Table 13B]

[0208] Example 5

[0209]

[0210] [Table 14]

[0211] Example 5

[0212] Telephoto end Bf Zr 1.0 2.3 f 19.703 44.942 FNo. 36.115 36.115 2ω (°) 2.75 2.76 DD

[18] 100.8 52.8 DD

[27] 0.929 48.517 DD

[29] 3.905 1.402 DD

[35] 26.578 1.443 Sn 21.463 1.513

[0213] [Table 15]

[0214] Example 5

[0215] KA 1 3 13 31 Figure 12 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 1.0978749E-05 -9.8731224E-06 6.1102194E-07 -3.1382746E-07 A6 -1.6527791E-08 1.3544760E-09 -4.6784885E-10 -2.0687752E-09 A8 2.7982320E-11 1.9209531E-11 2.7047527E-12 4.8699527E-11 A10 -3.8603815E-14 -1.1730632E-13 -8.6325312E-15 -5.5257409E-13 A12 4.0496039E-17 3.6358840E-16 1.5687743E-17 3.8011580E-15 A14 -3.0175474E-20 -6.7222309E-19 -1.3416789E-20 -1.5984094E-17 A16 1.4983312E-23 7.3935515E-22 -1.1246813E-24 4.0166727E-20 A18 -4.4255886E-27 -4.4740060E-25 1.0243312E-26 -5.5303305E-23 A20 5.9102577E-31 1.1479896E-28 -5.0939984E-30 3.2042280E-26

[0216] [Example 6]

[0217] A sectional view showing the structure of the zoom lens of Example 6 is shown in Figure 13 Example 6. The zoom lens of Example 6 includes, in order from the object side to the image side, a 1st lens group G1 having positive refractive power, a 2nd lens group G2 having negative refractive power, a 3rd lens group G3 having negative refractive power, a 4th lens group G4 having positive refractive power, and a 5th lens group G5 having positive refractive power. An intermediate lens group Gm includes the 3rd lens group G3 and the 4th lens group G4. A final lens group Gs includes the 5th lens group G5. During zooming, the 1st lens group G1 and the 5th lens group G5 are fixed with respect to the image plane Sim. During zooming, the 2nd lens group G2, the 3rd lens group G3, and the 4th lens group G4 respectively change the interval from the adjacent group and move along the optical axis Z.

[0218] Lens group G1 consists of 9 lenses, L1a to L1i, arranged sequentially from the object side to the image side. Lens group G2 consists of 6 lenses, L2a to L2f, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 4 lenses, L4a to L4d, arranged sequentially from the object side to the image side. Lens group G5 consists of 8 lenses, L5a to L5h, arranged sequentially from the object side to the image side. Lens L4c corresponds to the positive lens Lp, and lens L4d corresponds to the negative lens Ln.

[0219] The basic lens data of the zoom lens of Example 6 are shown in Tables 16A and 16B, the specifications and variable surface spacing are shown in Table 17, the aspherical coefficients are shown in Table 18, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 16B. Wide angle end middle.

[0220] [Table 16A]

[0221] Example 6

[0222]

[0223] [Table 16B]

[0224] Example 6

[0225]

[0226] [Table 17]

[0227] Example 6

[0228] Telephoto end Bf Zr 1.0 2.3 f 19.678 49.987 FNo. 44.416 44.416 2ω (°) 2.75 2.76 DD

[17] 101.2 48.4 DD

[27] 1.400 46.184 DD

[30] 23.201 1.403 DD

[38] 6.261 1.882 Sn 20.006 1.399

[0229] [Table 18]

[0230] Example 6

[0231] KA 1 3 16 18 Figure 14 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.5818185E-06 -6.1735664E-06 -4.6455558E-07 -3.1654885E-18 A6 -9.7587178E-09 7.5718943E-10 -7.0210851E-11 1.0129261E-09 A8 1.0235792E-11 4.5585013E-12 2.6250912E-14 -1.0383995E-11 A10 -5.5857009E-15 -1.3025374E-14 1.5577569E-17 4.4782513E-14 A12 -3.8336479E-20 6.8098039E-18 -1.6336385E-19 -7.6419691E-17 A14 1.4349002E-21 9.0518001E-21 1.0474328E-22 -6.5422655E-20 A16 1.6395797E-25 -4.4671387E-24 7.4281621E-26 5.5595799E-22 A18 -7.1651574E-28 -1.2947190E-26 9.0193214E-29 -1.6864692E-25 A20 2.3214186E-31 9.5625929E-30 -1.5714851E-31 -1.9255531E-27

[0232] [Example 7]

[0233] A cross-sectional view showing the structure of the zoom lens of Embodiment 7 is shown in Figure 15 In Embodiment 7, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, and a fourth lens group G4 with positive refractive power. The intermediate lens group Gm includes the third lens group G3. The final lens group Gs includes the fourth lens group G4. During zooming, the first lens group G1 and the fourth lens group G4 are fixed relative to the image plane Sim. During zooming, the second lens group G2 and the third lens group G3 change their spacing from adjacent groups and move along the optical axis Z.

[0234] The first lens group G1 includes, in order from the object side to the image side, ten lenses L1a to L1j. The second lens group G2 includes, in order from the object side to the image side, six lenses L2a to L2f. The third lens group G3 includes, in order from the object side to the image side, an aperture stop St and three lenses L3a to L3c. The fourth lens group G4 includes, in order from the object side to the image side, nine lenses L4a to L4i. The lens L4f corresponds to the positive lens Lp, and the lens L4g corresponds to the negative lens Ln.

[0235] The basic lens data of the zoom lens of Example 7 is shown in Table 19A and Table 19B, the specifications and variable face intervals are shown in Table 20, the aspherical coefficients are shown in Table 21, and the various aberrations in the state of focusing on an infinite object are shown in Figs. 17A to 17F. Wide angle end

[0236] [Table 19A]

[0237] Example 7

[0238]

[0239] [Table 19B]

[0240] Example 7

[0241]

[0242] [Table 20]

[0243] Example 7

[0244] Telephoto end Bf Zr 1.0 2.0 f 22.004 44.008 FNo. 34.875 34.875 2ω (°) 2.75 2.72 DD

[18] 95.0 54.0 DD

[28] 1.960 38.332 DD

[34] 20.764 1.476 Sn 19.131 2.047

[0245] [Table 21]

[0246] Example 7

[0247] KA 1 3 13 30 Figure 16 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 5.7238432E-06 -4.6198739E-06 9.1183306E-07 -2.3590920E-07 A6 -5.1277326E-09 1.4483466E-09 -1.1779856E-09 -1.5322076E-09 A8 4.9660384E-12 -7.3701293E-12 6.9277528E-12 1.6149535E-11 A10 -3.3668015E-15 5.7367897E-14 -2.0750367E-14 -4.9431664E-14 A12 2.0876440E-18 -2.3489349E-16 3.6808394E-17 -2.0318190E-16 A14 -1.8823090E-21 5.4055227E-19 -3.9494407E-20 2.4074246E-18 A16 1.6112252E-24 -7.1422351E-22 2.4660820E-23 -8.9758402E-21 A18 -7.5902400E-28 5.0657275E-25 -7.9376516E-27 1.5525216E-23 A20 1.4066650E-31 -1.4940841E-28 9.2170309E-31 -1.0408680E-26

[0248] [Example 8]

[0249] A sectional view showing the structure of the zoom lens of Example 8 is shown in Fig. 18A. Figure 17 ​The zoom lens of Example 8 includes, in order from the object side to the image side, a 1st lens group G1 having positive refractive power, a 2nd lens group G2 having negative refractive power, a 3rd lens group G3 having positive refractive power, a 4th lens group G4 having positive refractive power, and a 5th lens group G5 having positive refractive power. The intermediate lens group Gm includes the 3rd lens group G3 and the 4th lens group G4. The final lens group Gs includes the 5th lens group G5. During zooming, the 1st lens group G1 and the 5th lens group G5 are fixed with respect to the image plane Sim. During zooming, the 2nd lens group G2, the 3rd lens group G3, and the 4th lens group G4 move along the optical axis Z by changing the interval from the adjacent group, respectively.

[0250] The 1st lens group G1 includes, in order from the object side to the image side, 10 lenses L1a to L1j. The 2nd lens group G2 includes, in order from the object side to the image side, 5 lenses L2a to L2e. The 3rd lens group G3 includes, in order from the object side to the image side, 2 lenses L3a to L3b. The 4th lens group G4 includes, in order from the object side to the image side, a stop St, and 3 lenses L4a to L4c. The 5th lens group G5 includes, in order from the object side to the image side, 8 lenses L5a to L5h. The lens L3a corresponds to the positive lens Lp, and the lens L3b corresponds to the negative lens Ln.

[0251] The basic lens data of the zoom lens of Example 8 is shown in Table 22A and Table 22B, the specifications and variable face intervals are shown in Table 23, the aspherical coefficients are shown in Table 24, the aberration diagrams of the state of focusing on an infinite object are shown in Wide angle end

[0252] [Table 22A]

[0253] Example 8

[0254]

[0255] [Table 22B]

[0256] Example 8

[0257]

[0258] [Table 23]

[0259] Example 8

[0260] Telephoto end Bf Zr 1.0 2.3 f 19.699 44.933 FNo. 37.356 37.356 2ω (°) 2.75 2.75 DD

[19] 100.0 52.4 DD

[27] 1.493 45.505 DD

[30] 11.473 1.475 DD

[36] 19.750 1.490 Sn 17.763 2.009

[0261] [Table 24]

[0262] Example 8

[0263] KA 1 3 12 49 Figure 18 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 6.1717302E-06 -4.5297258E-06 -1.4773137E-07 2.8038815E-06 A6 -6.0176978E-09 2.5590904E-09 -6.4157731E-10 -6.9766557E-10 A8 5.3797093E-12 -4.5622554E-12 7.8153520E-12 1.5634384E-11 A10 9.1753675E-16 2.2641762E-14 -4.0036728E-14 -2.1610882E-13 A12 -1.0446270E-17 -1.0240072E-16 1.1406218E-16 1.7397120E-15 A14 1.4815198E-20 2.6518865E-19 -1.9281326E-19 -7.9137992E-18 A16 -1.0514585E-23 -3.7843038E-22 1.9055601E-22 2.1027883E-20 A18 3.8801605E-27 2.7922150E-25 -1.0115771E-25 -3.0651401E-23 A20 -5.9144123E-31 -8.3281136E-29 2.2128100E-29 1.9462228E-26

[0264] [Example 9]​

[0265] A sectional view showing the configuration of the zoom lens of Example 9 is shown in Figure 19 Example 9. The zoom lens of Example 9 includes, in order from the object side to the image side, a 1st lens group G1 having positive refractive power, a 2nd lens group G2 having negative refractive power, a 3rd lens group G3 having negative refractive power, a 4th lens group G4 having positive refractive power, and a 5th lens group G5 having positive refractive power. The intermediate lens group Gm includes the 3rd lens group G3 and the 4th lens group G4. The final lens group Gs includes the 5th lens group G5. During zooming, the 1st lens group G1 and the 5th lens group G5 are fixed with respect to the image plane Sim. During zooming, the 2nd lens group G2, the 3rd lens group G3, and the 4th lens group G4 respectively change the interval from the adjacent group and move along the optical axis Z.

[0266] The 1st lens group G1 includes, in order from the object side to the image side, 9 lenses L1a to L1i. The 2nd lens group G2 includes, in order from the object side to the image side, 6 lenses L2a to L2f. The 3rd lens group G3 includes, in order from the object side to the image side, 2 lenses L3a to L3b. The 4th lens group G4 includes, in order from the object side to the image side, an aperture stop St and 4 lenses L4a to L4d. The 5th lens group G5 includes, in order from the object side to the image side, 8 lenses L5a to L5h. The lens L5d corresponds to the positive lens Lp, and the lens L5e corresponds to the negative lens Ln.

[0267] The basic lens data of the zoom lens of Example 9 is shown in Table 25A and Table 25B, the specifications and variable face intervals are shown in Table 26, the aspherical coefficients are shown in Table 27, and the various aberration diagrams of the state of focusing on an infinite object are shown in Wide angle end .

[0268] [Table 25A]

[0269] Example 9

[0270]

[0271] [Table 25B]

[0272] Example 9

[0273]

[0274] [Table 26]

[0275] Example 9

[0276] Telephoto end Bf Zr 1.0 2.5 f 19.677 49.985 FNo. 44.598 44.598 2ω (°) 2.75 2.76 DD

[17] 101.2 48.4 DD

[27] 1.400 46.194 DD

[30] 23.223 1.407 DD

[38] 6.248 1.882 Sn 20.014 1.402

[0277] [Table 27]

[0278] Example 9

[0279] KA 1 3 16 18 Figure 20 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.5861252E-06 -6.1755938E-06 -4.6453036E-07 -2.7545836E-08 A6 -9.7583854E-09 7.5290638E-10 -6.9710762E-11 1.0119310E-09 A8 1.0235954E-11 4.5570370E-12 2.6617366E-14 -1.0244819E-11 A10 -5.5845927E-15 -1.3024286E-14 1.4972715E-17 4.4954120E-14 A12 -3.9584773E-20 6.8056432E-18 -1.6344392E-19 -7.7527308E-17 A14 1.4359616E-21 9.0593115E-21 1.0370408E-22 -7.4752695E-20 A16 1.6314332E-25 -4.4715872E-24 7.5037283E-26 5.6775785E-22 A18 -7.1620035E-28 -1.2942142E-26 9.0107137E-29 -1.1252817E-25 A20 2.3217356E-31 9.5647004E-30 -1.5638593E-31 -1.9729098E-27

[0280] [Example 10]

[0281] A cross-sectional view showing the structure of the zoom lens of Embodiment 10 is shown in Figure 21 In Example 10, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0282] Lens group G1 consists of 9 lenses, L1a to L1i, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 4 lenses, L4a to L4d, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side. Lens L5e corresponds to the positive lens Lp, and lens L5f corresponds to the negative lens Ln.

[0283] The basic lens data of the zoom lens of Example 10 are shown in Tables 28A and 28B, the specifications and variable surface spacing are shown in Table 29, the aspherical coefficients are shown in Table 30, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 28B. Wide angle end middle.

[0284] [Table 28A] Example 10

[0285]

[0286] [Table 28B]

[0287] Example 10

[0288]

[0289] [Table 29]

[0290] Example 10

[0291] Telephoto end Bf Zr 1.0 2.3 f 19.674 44.982 FNo. 39.664 39.664 2ω (°) 2.75 2.76 DD

[17] 100.8 53.2 DD

[25] 1.400 47.337 DD

[28] 26.861 1.394 DD

[36] 3.477 1.871 Sn 20.269 1.405

[0292] [Table 30]

[0293] Example 10

[0294] KA 1 3 16 30 Figure 22 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.6514649E-06 -6.5538024E-06 -2.9194923E-07 -1.0959113E-07 A6 -9.6688630E-09 7.9862477E-10 -1.4686115E-11 -1.0394234E-09 A8 9.9704174E-12 4.1710477E-12 -2.0616999E-13 7.4552103E-12 A10 -5.3661148E-15 -1.1896135E-14 2.1952163E-16 -1.6966340E-14 A12 -3.4563592E-20 7.1454562E-18 2.8438149E-20 -2.3184144E-17 A14 1.3516908E-21 7.9297546E-21 -1.7223005E-22 1.2779887E-19 A16 1.6604575E-25 -5.7275142E-24 7.4982634E-26 1.9189568E-22 A18 -6.8237143E-28 -1.1936475E-26 -4.1240805E-29 -1.3800862E-24 A20 2.2118208E-31 1.0176655E-29 4.3107296E-32 1.6108591E-27

[0295] [Example 11]

[0296] A cross-sectional view showing the structure of the zoom lens of Embodiment 11 is shown in Figure 23 In Example 11, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0297] Lens group G1 consists of 10 lenses, L1a to L1j, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side.

[0298] The basic lens data of the zoom lens of Example 11 are shown in Tables 31A and 31B, the specifications and variable surface spacing are shown in Table 32, the aspherical coefficients are shown in Table 33, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 31B. Sn In addition, the entries for dN / dT and material name are omitted in Tables 31A and 31B.

[0299] [Table 31A]

[0300] Example 11

[0301] Nd R D νd θgF DD

[19] *1 -1840.06159 2.500 1.80610 33.27 0.5885 2 39.75599 8.283 *3 41.56169 2.000 1.90366 31.31 0.5948 4 32.37692 15.594 5 -106.89205 1.400 1.87702 32.47 0.5919 6 -710.36492 4.104 7 -296.95098 1.400 1.43700 95.10 0.5336 8 66.89418 0.494 9 70.36366 6.873 1.84666 23.78 0.6205 10 -457.54989 5.619 11 223.92526 5.896 1.43700 95.10 0.5336 *12 -111.66500 0.120 13 449.03998 1.400 1.59270 35.31 0.5934 14 155.22256 10.158 15 121.85978 1.400 1.84666 23.78 0.6205 16 51.73980 9.623 1.43700 95.10 0.5336 17 -227.47097 0.120 18 113.66856 9.122 1.69560 59.05 0.5435 19 -74.79804 DD

[27] 20 131.39684 0.800 1.89181 38.82 0.5734 21 27.85170 2.677 22 73.28693 0.810 1.43700 95.10 0.5336 23 24.48762 4.029 1.99985 24.34 0.6214 24 56.74226 3.385 25 -59.41374 1.000 1.87899 21.05 0.6361 26 -56.11556 0.810 1.87898 40.10 0.5703 27 128.55618 DD

[31] 28 184.54842 3.671 1.45751 64.11 0.5302 29 -59.13985 0.000 30 -86.08590 0.800 1.85000 38.66 0.5750 31 -124.03719 Sn

[0302] [Table 31B]

[0303] Example 11

[0304] Nd R D νd θgF 32 (St) Wide angle end ∞ 1.000 33 56.87110 4.460 1.80518 25.42 0.6162 34 -210.35927 0.120 35 72.50428 6.953 1.48650 71.11 0.5303 36 -42.16447 0.500 1.89268 35.50 0.5827 37 180.05157 Telephoto end 38 48.02449 8.290 1.58185 67.41 0.5416 39 -76.91013 0.121 40 53.29468 5.808 1.64712 34.34 0.5929 41 -142.68301 1.010 1.64711 53.34 0.5500 42 -219.11468 0.169 43 231.85653 6.992 1.69560 59.05 0.5435 44 -31.11369 1.000 1.99514 26.50 0.6092 45 20.51167 7.246 1.53469 73.12 0.5380 46 366.09557 2.266 47 -54.81464 3.245 1.43352 90.23 0.5306 48 -28.44124 0.800 1.90372 33.14 0.5892 49 253.76796 0.129 50 61.52665 5.781 1.89850 20.08 0.6414 *51 -78.44820 2.000 52 ∞ 3.620 1.51680 64.20 0.5343 53 ∞ 34.198

[0305] [Table 32]

[0306] Example 11

[0307] Bf FNo. Zr 1.0 2.5 f 19.660 49.927 2ω (°) 34.199 34.199 DD

[19] 2.75 2.76 DD

[27] 100.2 47.8 DD

[31] 1.282 46.923 DD

[37] 1.444 1.447 Sn 28.045 1.408 KA 20.434 1.427

[0308] [Table 33]

[0309] Example 11

[0310] Figure 24 1 3 12 51 Figure 25 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 1.1858250E-05 -9.4877012E-06 4.2276134E-07 7.1417138E-06 A6 -1.9623540E-08 2.9707467E-09 1.7700871E-09 -4.8799576E-08 A8 3.3395437E-11 2.3417938E-11 -1.2195565E-11 9.3252320E-10 A10 -4.3800654E-14 -1.2079085E-13 5.9997495E-14 -1.0782048E-11 A12 4.2928998E-17 2.8294399E-16 -1.8876274E-16 7.7640748E-14 A14 -3.0382040E-20 -3.8422055E-19 3.6931743E-19 -3.4993264E-16 A16 1.4914532E-23 3.0558519E-22 -4.3728355E-22 9.5656217E-19 A18 -4.5751759E-27 -1.3219409E-25 2.8719880E-25 -1.4470756E-21 A20 6.6692341E-31 2.4152635E-29 -8.0395850E-29 9.2771322E-25

[0311] [Example 12]

[0312] A cross-sectional view showing the structure of the zoom lens of Embodiment 12 is shown. Sn In Example 12, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0313] Lens group G1 consists of 9 lenses, L1a to L1i, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 4 lenses, L4a to L4d, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side.

[0314] The basic lens data of the zoom lens of Example 12 are shown in Tables 34A and 34B, the specifications and variable surface spacing are shown in Table 35, the aspherical coefficients are shown in Table 36, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 34B. Nd In addition, the entries for dN / dT and material name are omitted in Tables 34A and 34B.

[0315] [Table 34A]

[0316] Example 12

[0317] νd R D θgF DD

[17] DD

[25] *1 892.49525 2.399 1.80610 33.27 0.5885 2 34.82975 13.151 *3 56.26982 1.800 1.90366 31.31 0.5948 4 41.90958 12.000 5 -108.93770 1.800 1.81973 46.03 0.5585 6 317.92224 8.720 7 119.33157 5.196 1.78880 28.43 0.6009 8 -544.36982 2.813 9 -621.74991 5.803 1.43700 95.10 0.5336 10 -86.16729 0.131 11 183.73060 1.801 1.65455 39.33 0.5786 12 118.18071 10.319 13 77.18470 1.801 1.85243 23.78 0.6207 14 50.15800 11.233 1.43700 95.10 0.5336 15 -315.93924 1.244 *16 168.92201 8.089 1.69680 55.53 0.5434 17 -85.24746 DD

[28] 18 123.39767 1.101 1.91082 35.25 0.5822 19 32.73033 7.716 20 424.39507 0.961 1.49700 81.61 0.5389 21 31.59016 4.801 1.85134 23.31 0.6240 22 204.42787 2.775 23 -57.58046 1.001 1.84999 26.84 0.6105 24 -600.69551 1.411 1.84999 43.00 0.5640 25 -213.24817 Sn 26 820.72889 4.357 1.58471 39.53 0.5802 27 -45.41822 1.051 1.75341 52.32 0.5464 28 366.89329 Nd

[0318] [Table 34B]

[0319] Example 12

[0320] νd R D θgF 29 (St) Wide angle end Telephoto end ∞ 1.500 *30 80.39416 4.523 1.80100 34.97 0.5864 31 -121.02490 0.121 32 -425.40151 2.000 1.72465 28.77 0.6071 33 -204.94084 1.160 34 147.52786 8.010 1.53775 74.70 0.5394 35 -36.61292 1.101 1.81796 44.43 0.5620 36 792.64131 Bf 37 62.69211 5.441 1.49700 81.61 0.5389 38 -265.89994 0.120 39 270.35940 4.852 1.53001 49.37 0.5621 40 -73.76871 0.121 41 98.11020 1.101 1.84850 43.79 0.5620 42 42.61664 4.659 1.84666 23.83 0.6160 43 201.50630 0.201 44 50.23818 8.667 1.59282 68.62 0.5441 45 -40.81754 1.050 1.90000 23.78 0.6219 46 30.27224 3.286 47 115.25643 8.265 1.49700 81.61 0.5389 48 -24.34721 1.050 1.89000 37.23 0.5779 49 -866.21591 2.524 50 112.17456 7.192 1.51742 52.43 0.5565 51 -45.92041 2.000 52 ∞ 3.620 1.51680 64.20 0.5343 53 ∞ 40.311

[0321] [Table 35]

[0322] Example 12

[0323] FNo. 2ω (°) Zr 1.0 2.3 f 19.674 44.983 DD

[17] 40.312 40.312 DD

[25] 2.75 2.76 DD

[28] 100.2 52.8 DD

[36] 1.400 46.751 Sn 25.465 1.396 KA 4.556 1.889 Figure 26 20.018 1.404

[0324] [Table 36]

[0325] Example 12

[0326] Figure 27 1 3 16 30 Sn 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 8.4093492E-06 -6.4177718E-06 -2.2422091E-07 -1.5944892E-07 A6 -9.2344811E-09 7.9462530E-10 -2.4861004E-12 -6.7275573E-10 A8 9.4724546E-12 3.9132089E-12 -2.1241977E-13 4.1919468E-12 A10 -5.0886254E-15 -1.1189623E-14 2.4268941E-16 -4.3526490E-15 A12 -1.2372005E-20 6.6920423E-18 5.1205982E-20 -2.4604441E-17 A14 1.2674042E-21 7.4433425E-21 -2.4175303E-22 3.9723046E-20 A16 1.5426198E-25 -5.3578418E-24 1.1861361E-26 2.1106331E-22 A18 -6.4327240E-28 -1.0913053E-26 1.6409289E-28 -7.4095211E-25 A20 2.0953200E-31 9.1947649E-30 -6.7350733E-32 7.1030921E-28

[0327] [Example 13]

[0328] A cross-sectional view showing the structure of the zoom lens of Embodiment 13 is shown in Nd In Example 13, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0329] Lens group G1 consists of 10 lenses, L1a to L1j, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side.

[0330] The basic lens data of the zoom lens of Example 13 are shown in Tables 37A and 37B, the specifications and variable surface spacing are shown in Table 38, the aspherical coefficients are shown in Table 39, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 37B. νd In addition, the entries for dN / dT and material name are omitted in Tables 37A and 37B.

[0331] [Table 37A]

[0332] Example 13

[0333] θgF R D DD

[19] DD

[27] DD

[30] *1 3361.49502 2.500 1.80100 34.97 0.5864 2 42.59809 9.135 *3 61.25402 2.000 1.90366 31.31 0.5948 4 39.35106 16.006 5 -71.83047 1.250 1.43700 95.10 0.5336 6 733.97690 5.402 7 105.59128 5.116 1.84666 23.78 0.6192 8 -7423.25581 3.581 9 -115.07700 1.500 1.59270 35.31 0.5934 10 -154.12994 1.491 *11 100.31212 8.227 1.43700 95.10 0.5336 12 -135.30840 0.120 13 2155.68153 1.500 1.58041 39.96 0.5794 14 273.06875 7.672 15 144.54300 1.500 1.78880 28.43 0.6009 16 54.70175 12.944 1.43700 95.10 0.5336 17 -135.01732 0.120 18 209.01469 8.486 1.69560 59.05 0.5435 19 -86.46085 Sn 20 105.77699 1.190 1.90882 37.12 0.5777 21 29.02955 4.131 22 931.19002 1.150 1.43700 95.10 0.5336 23 27.84983 4.509 2.00069 25.46 0.6136 24 90.73626 3.225 25 -58.85634 1.122 1.89999 20.00 0.6419 26 -53.86251 0.700 1.90000 38.00 0.5755 27 140.61327 Nd 28 192.70206 4.259 1.43001 90.77 0.5302 29 -56.67798 1.140 1.90000 20.00 0.6419 30 -61.22245 νd

[0334] [Table 37B]

[0335] Example 13

[0336] θgF R D 31 (St) Wide angle end Telephoto end Bf ∞ 1.001 32 56.94781 4.434 1.82156 23.92 0.6197 33 -742.21115 0.120 34 69.43570 7.600 1.50001 55.00 0.5525 35 -48.07892 0.500 1.89999 36.11 0.5808 36 136.79752 FNo. 37 48.91757 7.985 1.57228 68.84 0.5410 38 -91.74811 0.120 39 42.96988 1.200 1.48399 58.00 0.5472 40 40.86406 6.260 1.52589 50.15 0.5607 41 -326.40378 1.604 42 157.05961 6.654 1.72974 55.01 0.5441 43 -33.27142 1.080 2.00069 25.46 0.6136 44 22.66202 0.120 45 22.94000 9.873 1.43700 95.10 0.5336 46 -34.76242 1.000 1.90366 31.31 0.5948 47 -227.46944 2.335 48 -41.60026 1.130 1.87650 40.35 0.5697 49 14285.02022 0.120 50 65.84945 5.398 1.90000 20.00 0.6419 *51 -65.21462 2.000 52 ∞ 2.620 1.51680 64.20 0.5343 53 ∞ 35.304

[0337] [Table 38]

[0338] Example 13

[0339] 2ω (°) DD

[19] Zr 1.0 2.9 f 20.696 59.907 DD

[27] 35.302 35.302 DD

[30] 2.75 2.76 DD

[36] 98.6 40.8 Sn 1.343 56.301 KA 3.262 1.463 Figure 28 34.155 1.368 Figure 29 21.851 1.479

[0340] [Table 39]

[0341] Example 13

[0342] Sn 1 3 11 51 Nd 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 6.2385404E-06 -4.2498997E-06 -1.2916591E-06 8.3797972E-06 A6 -8.4729553E-09 2.7953596E-09 -2.7332774E-10 -3.9008076E-08 A8 1.7157211E-11 -4.8702741E-12 2.9097833E-12 7.2609102E-10 A10 -2.9563262E-14 -1.9879316E-15 -9.3668810E-15 -7.8313114E-12 A12 3.8845521E-17 8.6960820E-18 2.0337784E-17 5.2580025E-14 A14 -3.5714076E-20 3.2438780E-21 -2.8718443E-20 -2.2274484E-16 A16 2.1393224E-23 -2.2817654E-23 2.5100612E-23 5.7734840E-19 A18 -7.4278742E-27 1.9989888E-26 -1.2338202E-26 -8.3450642E-22 A20 1.1355785E-30 -5.2422328E-30 2.6097638E-30 5.1440585E-25

[0343] [Example 14] A cross-sectional view showing the structure of the zoom lens of Example 14 is shown in... νd In Example 14, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0344] Lens group G1 consists of 9 lenses, L1a to L1i, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 9 lenses, L5a to L5i, arranged sequentially from the object side to the image side.

[0345] The basic lens data of the zoom lens of Example 14 are shown in Tables 40A and 40B, the specifications and variable surface spacing are shown in Table 41, the aspherical coefficients are shown in Table 42, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 40B. θgF In addition, the entries for dN / dT and material name are omitted in Tables 40A and 40B.

[0346] [Table 40A]

[0347] Example 14

[0348] DD

[17] R D DD

[26] DD

[29] Sn *1 967.71012 2.500 1.77250 49.60 0.5521 2 27.63765 13.422 *3 58.04526 2.000 1.90999 37.00 0.5780 4 32.97922 13.095 5 -54.81547 1.250 1.43700 95.10 0.5336 6 222.84280 0.120 7 83.31824 6.422 1.51330 52.55 0.5564 8 -146.13047 10.846 9 341.00398 6.400 1.43700 95.10 0.5336 10 -78.49028 0.120 11 65.23033 1.500 1.85664 22.23 0.6305 12 55.72350 11.225 13 368.60738 1.500 1.89999 20.00 0.6419 14 200.16208 10.753 1.43700 95.10 0.5336 15 -45.77424 0.120 16 64.66883 3.490 1.69560 59.05 0.5435 17 145.75006 Nd 18 140.59941 1.190 1.85888 42.11 0.5659 19 33.81246 3.083 20 348.08808 1.140 1.80267 47.73 0.5552 21 67.08336 0.388 22 44.62420 3.712 1.86017 21.99 0.6316 23 ∞ 1.503 24 -75.14754 2.450 1.57784 40.40 0.5786 25 -40.26691 0.700 1.89894 38.11 0.5752 26 647.99363 νd 27 134.97220 3.418 1.56616 44.44 0.5707 28 -101.26755 1.140 1.89359 38.64 0.5739 29 -129.95815 θgF

[0349] [Table 40B]

[0350] Example 14

[0351] 30 (St) R D Wide angle end Telephoto end Bf FNo. ∞ 1.000 31 65.96183 5.056 1.63604 34.57 0.5925 32 -99.73413 0.120 33 102.08347 6.511 1.50001 55.00 0.5525 34 -42.40263 0.500 1.89958 38.04 0.5754 35 164.30173 2ω (°) 36 48.66321 7.263 1.52512 70.02 0.5352 37 -79.42990 0.149 38 241.00125 1.200 1.89546 34.88 0.5844 39 71.86821 4.167 1.73274 29.06 0.6060 40 -209.91187 4.422 41 60.94801 7.428 1.56646 69.78 0.5406 42 -36.36249 1.080 1.89938 29.33 0.6012 43 30.07274 0.120 44 28.21978 10.065 1.43700 95.10 0.5336 45 -32.25504 1.010 1.60448 37.55 0.5848 46 -192.40114 0.710 47 -128.13814 1.130 1.89999 28.47 0.6040 48 66.42508 0.120 49 58.69365 4.042 1.83701 23.15 0.6249 *50 -147.24382 2.000 51 ∞ 2.620 1.51680 64.20 0.5343 52 ∞ 34.738

[0352] [Table 41]

[0353] Example 14

[0354] DD

[17] DD

[26] Zr 1.0 2.0 f 17.582 34.934 DD

[29] Sn Nd νd θgF 30 (St) Wide angle end Telephoto end Bf FNo. 34.740 34.740 FNo. 2.75 2.76 2ω (°) 107.6 65.2 DD

[17] 1.815 47.044 DD

[26] 9.324 1.507 DD

[29] 18.900 1.517 DD

[35] 21.502 1.473

[0355] [Table 42]

[0356] Example 14

[0357] Sn 1 3 50 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 1.0590175E-05 -6.2358076E-06 5.1373648E-06 A6 -1.5089410E-08 1.5354729E-09 -1.1576681E-08 A8 2.6044458E11 -6.2482914E-12 2.8992302E-10 A10 -3.8219296E-14 8.8592098E-14 -3.2771306E-12 A12 4.3396502E-17 -5.5504755E-16 2.2257508E-14 A14 -3.4059263E-20 1.7237683E-18 -9.1628534E-17 A16 1.6758233E-23 -2.8667719E-21 2.2274197E-19 A18 -4.4674630E-27 2.4059395E-24 -2.8963443E-22 A20 4.8066451E-31 -7.8909124E-28 1.5037554E-25

[0358] [Example 15]

[0359] A cross-sectional view showing the structure of the zoom lens of Embodiment 15 is shown in Fig. 30 In Example 15, the zoom lens, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with positive refractive power. The intermediate lens group Gm includes the third lens group G3 and the fourth lens group G4. The final lens group Gs includes the fifth lens group G5. During zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim. During zooming, the second lens group G2, the third lens group G3, and the fourth lens group G4 change their spacing from adjacent groups and move along the optical axis Z.

[0360] Lens group G1 consists of 10 lenses, L1a to L1j, arranged sequentially from the object side to the image side. Lens group G2 consists of 5 lenses, L2a to L2e, arranged sequentially from the object side to the image side. Lens group G3 consists of 2 lenses, L3a to L3b, arranged sequentially from the object side to the image side. Lens group G4 consists of 3 lenses, L4a to L4c, arranged sequentially from the object side to the image side. Lens group G5 consists of 7 lenses, L5a to L5g, arranged sequentially from the object side to the image side.

[0361] The basic lens data of the zoom lens of Example 15 are shown in Tables 43A and 43B, the specifications and variable surface spacing are shown in Table 44, the aspherical coefficients are shown in Table 45, and the aberrations of the state when focusing on an object at infinity are illustrated in Table 45. Fig. 31 In addition, the entries for dN / dT and material name are omitted in Tables 43A and 43B.

[0362] [Table 43A]

[0363] Example 15

[0364] Sn R D Nd νd θgF *1 203.42644 2.500 1.80100 34.97 0.5864 2 30.99502 16.450 *3 74.76239 2.000 2.00069 25.46 0.6136 4 42.62529 18.896 5 -53.48118 1.400 1.49700 81.54 0.5375 6 -243.50052 0.121 7 130.23115 6.120 1.66382 27.35 0.6320 8 -167.03427 1.556 9 -2279.36265 1.500 1.75575 24.71 0.6291 10 211.29277 3.011 11 5554.48783 6.008 1.59282 68.62 0.5441 *12 -95.44252 8.531 13 106.92189 6.074 1.49700 81.54 0.5375 14 -369.90146 3.890 15 127.21849 1.400 1.80000 29.84 0.6018 16 50.31970 12.210 1.43700 95.10 0.5336 17 -112.74939 0.121 18 286.37855 5.436 1.61490 39.88 0.5786 19 -108.52930 DD

[19] 20 57.04391 1.138 1.90043 37.37 0.5772 21 27.09299 7.420 22 -118.41411 0.810 1.43700 95.10 0.5336 23 29.49460 4.972 1.85025 30.05 0.5980 24 182.38104 3.321 25 -46.05734 1.759 1.66382 27.35 0.6320 26 -37.12705 0.800 1.69560 59.05 0.5435 27 317.60426 DD

[27] 28 376.38055 3.917 1.87070 40.73 0.5683 29 -58.57740 0.810 1.66382 27.35 0.6320 30 2189.94018 DD

[30]

[0365] [Table 43B]

[0366] Example 15

[0367] Sn R D Nd νd θgF 31 (St) ∞ 1.356 32 126.95242 3.071 1.89286 20.36 0.6394 33 -202.19149 0.120 34 48.07484 8.169 1.49700 81.54 0.5375 35 -51.98437 0.800 1.83557 31.48 0.5962 36 115.51448 DD

[36] 37 133.67730 9.857 1.88123 27.78 0.6066 38 -94.36325 3.311 39 43.08483 1.000 1.83627 32.48 0.5931 40 24.85515 13.411 1.43700 95.10 0.5336 41 -58.41518 0.163 42 -92.61025 9.194 1.59270 35.31 0.5934 43 -25.25558 1.000 2.05090 26.94 0.6052 44 74.44563 0.478 45 53.19547 12.206 1.48749 70.24 0.5301 46 -29.27809 1.148 47 -62.10509 1.000 1.78470 26.29 0.6136 *48 -137.38171 2.000 49 ∞ 3.620 1.51680 64.20 0.5343 50 ∞ 37.221

[0368] [Table 44]

[0369] Example 15

[0370] Wide-angle end Telephoto end Zr 1.0 2.3 f 19.696 44.927 Bf 37.220 37.220 FNo. 2.75 2.75 2ω (°) 100.4 52.6 DD

[19] 1.499 42.353 DD

[27] 8.550 1.538 DD

[30] 21.557 1.583 DD

[36] 15.993 2.125

[0371] [Table 45]

[0372] Example 15

[0373] Sn 1 3 12 48 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A4 5.3785669E-06 -3.4307937E-06 -2.2626731E-08 2.9621070E-06 A6 -4.8494795E-09 3.4167768E-09 1.0227189E-10 2.3246759E-09 A8 4.8665795E-12 -1.8665580E-11 1.0771371E-12 -6.5317849E-11 A10 -1.5455508E-15 9.0157380E-14 -1.0365097E-14 9.5637738E-13 A12 -3.9697076E-18 -2.8938770E-16 3.9609774E-17 -7.4022324E-15 A14 6.9571629E-21 5.8394804E-19 -8.3984288E-20 3.3372961E-17 A16 -5.1843073E-24 -7.0620203E-22 1.0268104E-22 -8.6661350E-20 A18 1.9354201E-27 4.6662529E-25 -6.7903633E-26 1.1952072E-22 A20 -2.9454871E-31 -1.2925868E-28 1.8846303E-29 -6.7111424E-26

[0374] In Table 46, the corresponding values of the conditional expressions (1) to (9) of the zoom lenses of Examples 1 to 10 and the corresponding values of the conditional expressions (8) and (9) of the zoom lenses of Examples 11 to 15 are shown. Examples 1 to 15 are based on the d line. In Table 46, the values based on the d line are shown.

[0375] [Table 46]

[0376]

[0377]

[0378] From the above data, it is found that the zoom lenses of Examples 1 to 15 are miniaturized and various aberrations are well corrected to achieve high optical performance. Further, it is found that the zoom lenses of Examples 1 to 7 well correct chromatic aberration from the wide-angle end to the telephoto end while particularly suppressing variation in the focus position at the time of temperature change at the wide-angle end.

[0379] Next, an imaging device according to an embodiment of the present application will be described. In Fig. 32 A schematic configuration diagram of an imaging device 100 using the zoom lens 1 according to an embodiment of the present application as an example of the imaging device according to an embodiment of the present application is shown in FIG. 1. As the imaging device 100, for example, a broadcast camera, a movie camera, a camcorder, a surveillance camera, and the like can be given.

[0380] The imaging device 100 includes a zoom lens 1, a filter 2 disposed on the image side of the zoom lens 1, and an imaging element 3 disposed on the image side of the filter 2. In addition, in Fig. 32 a plurality of lenses included in the zoom lens 1 are schematically illustrated.

[0381] The imaging element 3 converts an optical image formed by the zoom lens 1 into an electric signal, and can use, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), or the like. The imaging element 3 is disposed so that its imaging surface coincides with the image surface of the zoom lens 1.

[0382] The imaging device 100 further includes a signal processing section 5 that performs arithmetic processing on an output signal from the imaging element 3, a display section 6 that displays an image formed by the signal processing section 5, and a zoom control section 7 that controls zooming of the zoom lens 1. In addition, in Fig. 32 only one imaging element 3 is illustrated in FIG. 1, but the imaging device can be of a so-called 3-plate type having three imaging elements.

[0383] The above-described embodiments and examples have been described for the purpose of describing the technology of the present application, but the technology of the present application is not limited to the above-described embodiments and examples, and various modifications can be made. For example, the radius of curvature, the interval between surfaces, the refractive index, the Abbe number, and the asphericity coefficient of each lens are not limited to the values illustrated in the above-described numerical examples, and other values can be used.

[0384] Symbol Explanation

[0385] 1 - zoom lens, 2 - filter, 3 - imaging element, 5 - signal processing section, 6 - display section, 7 - zoom control section, 100 - imaging device, G1 - first lens group, G2 - second lens group, G3 - third lens group, G4 - fourth lens group, G5 - fifth lens group, Gm - intermediate lens group, Gs - final lens group, L1a to L5i - lens, Ln - negative lens, Lp - positive lens, ta, wa - on-axis light beam, tb, wb - light beam at maximum angle of view, PP - optical component, Sim - image surface, St - aperture stop, Z - optical axis.

Claims

1. A zoom lens comprising, in order from an object side to an image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate lens group including one or two lens groups, and a final lens group having positive refractive power, During zooming, the second lens group moves along the optical axis, and the intervals of the adjacent lens groups are changed, At least one of the intermediate lens group and the final lens group includes a pair of positive and negative lenses arranged adjacently, where νp is an Abbe number of the positive lens at a d-line reference, where νn is an Abbe number of the negative lens at a d-line reference, where Nn is a refractive index of the negative lens with respect to a d-line, where (dNn / dT) x 10 is a temperature coefficient of the refractive index of the negative lens with respect to a d-line at 25°C, -6 where the unit of dNn / dT is °C, -1 the zoom lens satisfies -1.5 < dNn / dT < 3 (1) 0 < Nn + 0.0105 x νn - 2.2188 < 0.15 (2) 1.5 < νρ / νη < 2.5 (3) The conditional expression (1), the conditional expression (2), and the conditional expression (3) are represented.

2. The zoom lens according to claim 1, wherein The zoom lens satisfies 1.68 < Nn < 1.88 (4) 30 < νη < 50 (5) The conditional expression (4) and the conditional expression (5) are represented.

3. The zoom lens according to claim 1 or 2, wherein In the case where a focal length of the positive lens is set as fp, a focal length of the negative lens is set as fn, The temperature coefficient of the refractive index of the positive lens at 25°C with respect to the d line is set to (dNp / dT) x 10 -6 , The units of fp and fn are mm, and the unit of dNp / dT is °C -1 In this case, the zoom lens satisfies -0.2 < (dNp / dT) / fp + (dNn / dT) / fn < 0.2 (6) The conditional expression (6) is represented.

4. The zoom lens according to claim 1 or 2, wherein In the case where a partial dispersion ratio between g-line and F-line of the positive lens is set as θgFp and a partial dispersion ratio between g-line and F-line of the negative lens is set as θgFn, the zoom lens satisfies 0 < θgFn - θgFp < 0.07 (7) The conditional expression (7) is represented.

5. The zoom lens according to claim 1 or 2, wherein In the case where an average value of Abbe number at d-line reference for all positive lenses included in the intermediate lens group and the final lens group is set as νpave and an average value of Abbe number at d-line reference for all negative lenses included in the intermediate lens group and the final lens group is set as νnave, the zoom lens satisfies 1 < νpave / νnave < 1.85 (8) The conditional expression (8) is represented.

6. The zoom lens according to claim 1 or 2, wherein The first lens group is fixed with respect to an image plane at the time of zooming.

7. The zoom lens according to claim 1 or 2, wherein The final lens group is fixed with respect to an image plane at the time of zooming.

8. The zoom lens according to claim 1 or 2, wherein In the case where a focal length of the zoom lens at a wide-angle end in a state where focusing is performed on an object at infinity is set as fw and a focal length of the first lens group is set as f1, the zoom lens satisfies 0.3 < fw / f1 < 0.55 (9) The conditional expression (9) is represented.

9. The zoom lens according to claim 1 or 2, wherein The intermediate lens group includes, in order from an object side to an image side, a third lens group having positive refractive power and a fourth lens group having positive refractive power.

10. The zoom lens according to claim 1 or 2, wherein The intermediate lens group includes, in order from an object side to an image side, a third lens group having negative refractive power and a fourth lens group having positive refractive power.

11. The zoom lens according to claim 1, wherein The zoom lens satisfies -0.5 < dNn / dT < 2 (1-1) The conditional expression (1-1) is represented.

12. The zoom lens according to claim 1, wherein The zoom lens satisfies 0 < Nn + 0.0105 x νη - 2.2188 < 0.1 (2-1) The conditional expression (2-1) is represented.

13. The zoom lens according to claim 1, wherein The zoom lens satisfies 1.7 < νρ / νη < 2.3 (3-1) The conditional expression (3-1) is expressed.

14. The zoom lens according to claim 2, wherein The zoom lens satisfies 1.71 < Nn < 1.85 (4-1) The conditional expression (4-1) is expressed.

15. The zoom lens according to claim 2, wherein The zoom lens satisfies 33 < νη < 48 (5-1) The conditional expression (5-1) is expressed.

16. The zoom lens according to claim 3, wherein The zoom lens satisfies -0.15 < (dNp / dT) / fp + (dNn / dT) / fn < 0.15 (6-1) The conditional expression (6-1) is expressed.

17. The zoom lens according to claim 4, wherein The zoom lens satisfies 0.01 < θgFn - θgFp < 0.06 (7-1) The conditional expression (7-1) is expressed.

18. The zoom lens according to claim 5, wherein The zoom lens satisfies 1 < νρave / νηave < 1.8 (8-1) The conditional expression (8-1) is expressed.

19. An image pickup apparatus provided with the zoom lens according to any one of claims 1 to 18.

Images