Zoom lens and imaging apparatus

Abstract

To minimize focus breathing while reducing the weight of a movable lens group.SOLUTION: A zoom lens consists of: a front group comprising a positive first lens group and a plurality of intermediate lens groups including one or more negative lens groups; and a rear group comprising an aperture stop and a plurality of lens groups. In zooming from the wide-angle end to the telephoto end, the first lens group and a lens group on the most object side in the rear group do not move, and the plurality of intermediate lens groups move to an image side. The rear group includes a first focus lens group and a second focus lens group that move in focusing. The focal length fF1 of the first focus lens group, the focal length fF2 of the second focus lens group, the focal length fFw of the front group at the wide-angle end, and the focal length fw of the zoom lens at the wide-angle end satisfy the conditions of 0.2≤fF2 / fF1≤2.0 and -3≤fFw / fw<0.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens suitable for imaging devices such as digital cameras and video cameras.

Background Art

[0002] In a zoom lens, when zooming, it is required that the moving lens group is lightweight in order to suppress changes in the center of gravity associated with the movement of the lens group and to reduce the torque required for driving the lens group. Also, when focusing, it is required that the change in the angle of view is small, that is, the focus breathing is small, and that the moving lens group (focus group) is lightweight.

[0003] In a large-aperture telephoto zoom lens, generally, the refractive power of the first lens group on the object side is positive. At this time, by fixing the first lens group with the largest weight and adopting rear focusing, it is possible to achieve weight reduction of the lens group that moves during zooming and focusing. Also, since the change in the angle of view due to focus breathing is more prominent when the aperture is stopped down, it is required that the focus breathing is small in the state where the aperture is stopped down.

[0004] However, in order to achieve overall reduction in size and weight of the zoom lens while suppressing the diameter of the first lens group to a small size and ensuring sufficient peripheral light quantity, the chief ray of the peripheral light beam is likely to deviate from the center of the aperture, resulting in a so-called vignetting state. When the aperture is stopped down in the vignetting state, the focus breathing due to the movement of the lens group on the image side with respect to the aperture is likely to increase.

[0005] Patent Document 1 discloses a zoom lens in which, during zooming, a positive first lens group is fixed and a negative second lens group and a positive third lens group are moved, and during focusing, a negative first focus group and a negative second focus group are moved to reduce the weight of the moving lens group. Patent Document 2 discloses a zoom lens in which, during zooming, a positive first lens group is fixed and a negative second lens group and a negative third lens group are moved, and during focusing, a negative first focus group and a positive second focus group are moved to reduce the weight of the moving lens group.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in the zoom lens of Patent Document 1, since the number of lenses constituting the second lens group and the third lens group is large, they are not sufficiently lightweight, and since the movement amount of the focus group cannot be secured sufficiently, it is difficult to shorten the closest focusing distance. Further, in the zoom lens of Patent Document 2, although a configuration is adopted in which the aperture is arranged on the object side to reduce the single aperture, since the second focus group is positive, the lens diameter tends to be large and the weight tends to be heavy. Further, since the focus sensitivity of the first focus group is high with respect to the second focus group, the focus change during zooming tends to be large.

[0008] The present invention provides a zoom lens that reduces focus breathing while reducing the weight of the moving lens group.

Means for Solving the Problems

[0009] The zoom lens according to one aspect of the present invention is composed of a front group constituted by a plurality of intermediate lens groups including a first lens group with positive refractive power and one or more lens groups with negative refractive power, which are arranged in order from the object side to the image side, and a rear group constituted by an aperture stop and a plurality of lens groups. When zooming from the wide-angle end to the telephoto end, the first lens group and the most object-side lens group in the rear group are stationary, and each of the plurality of intermediate lens groups moves toward the image side, and the interval between adjacent lens groups among the lens groups included in the front group and the most object-side lens group in the rear group changes. The rear group includes a first focus lens group that moves respectively during focusing and a second focus lens group that is arranged on the image side of the first focus lens group. When the focal length of the first focus lens group is fF1, the focal length of the second focus lens group is fF2, the focal length of the front group at the wide-angle end is fFw, and the focal length of the zoom lens at the wide-angle end is fw, 0.2 ≦ fF2 / fF1 ≦ 2.0 -3 ≦ fFw / fw < 0 It is characterized by satisfying the following conditions. Note that the imaging device equipped with the above zoom lens also constitutes another aspect of the present invention.

Effects of the Invention

[0010] According to the present invention, in the zoom lens, it is possible to suppress focus breathing while reducing the weight of the moving lens group.

Brief Description of the Drawings

[0011]

Figure 1

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Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0013] FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5 and FIG. 6 respectively show the configurations of the zoom lenses of Examples 1 to 6 in a state of being focused on an infinite object. The zoom lenses of each example are used in various imaging devices such as digital video cameras, digital still cameras, broadcast cameras, silver halide film cameras, and surveillance cameras.

[0014] In each figure, the left side is the object side and the right side is the image side. img indicates the image plane. On the image plane img, the imaging surface (light-receiving surface) of the imaging element or the film surface (photosensitive surface) of the silver halide film is arranged.

[0015] In a zoom lens, a lens group is a collection of one or more lenses that move together during zooming (variation in focal length) between a wide-angle end and a telephoto end. That is, the distance between adjacent lens groups changes during zooming. In each figure, the i-th lens group from the object side is shown as lens group Bi. A lens group may include a diaphragm. Also, the wide-angle end and the telephoto end respectively indicate the zoom states of the maximum angle of view (shortest focal length) and the minimum angle of view (longest focal length) when the lens group that moves during zooming is located at both ends of the range where it can move on the optical axis mechanically or under control.

[0016] In each figure, STO has a diaphragm. The diaphragm STO determines the light beam of the open F-number (Fno), and the aperture diameter is variable for changing the depth of field. Also, a plurality of lens groups on the object side of the diaphragm STO are grouped together as the front group LF, and the lens groups on the image side of the front group LF including the diaphragm STO are grouped together as the rear group LR.

[0017] Under the lens group that moves during zooming, the movement trajectory from the wide-angle end to the telephoto end during zooming is indicated by an arrow. Also, under the lens group that moves during focusing (focus lens group), the movement trajectories for compensating for the image plane movement associated with zooming in the state of focusing on an infinite object and in the state of focusing on a closest object are indicated by a solid-line arrow and a dashed-line arrow, respectively. Note that the zoom lens of each embodiment includes two focus groups arranged on the image side of the diaphragm STO, and among them, the first focus lens group on the object side (hereinafter referred to as the first focus group) is shown as F1, and the second focus lens group on the image side (hereinafter referred to as the second focus group) is shown as F2.

[0018] Next, the specific configurations of the zoom lenses of each embodiment will be described. The zoom lens of each embodiment includes a front group LF composed of a plurality of intermediate lens groups including a first lens group B1 with positive refractive power and one or more lens groups with negative refractive power, which are arranged in order from the object side to the image side, and a rear group LR including a diaphragm STO and a plurality of lens groups. By fixing (immobilizing) the first lens group and the final lens group closest to the image side with respect to the image plane during zooming, the change in the center of gravity associated with zooming is reduced, and the dustproof performance is improved.

[0019] The plurality of lens groups included in the intermediate lens groups move toward the image side with different amounts of movement during zooming from the wide-angle end to the telephoto end, thereby improving the imaging performance at the intermediate zoom positions and enabling weight reduction of each lens group alone.

[0020] By reducing the weight of the moving lens group, it is possible to achieve a configuration with high retention performance of the zoom state and the focus state even when an impact is applied. Preferably, the intermediate lens group is composed of three or more lens groups and is moved with different amounts of movement, so that high optical performance can be obtained throughout the entire zoom range even with a high zoom ratio.

[0021] The rear group LR has a lens group that is fixed during zooming on the object side most, and by arranging the diaphragm STO within that lens group, an increase in the outer diameter of the lens is prevented. Also, the rear group LR arranges a first focus group F1 and a second focus group F2 on the image side of it to perform so-called floating focus, thereby suppressing aberration variation throughout the zoom range and at all object distances and obtaining high optical performance. The first focus group F1 and the second focus group F2 move toward the image side respectively during focusing from an infinite object to a closest object.

[0022] The zoom lens of each embodiment satisfies the conditions of the following formulas (1) and (2) in order to have high optical performance throughout the entire zoom range and the entire focus range while being reduced in size and weight as a whole, and to reduce focus breathing.

[0023] 0.2 ≤ fF2 / fF1 ≤ 2.0 (1) -3 ≤ fFw / fw < 0 (2) In Expressions (1) and (2), fw is the focal length of the entire zoom lens at the wide-angle end, fF1 is the focal length of the first focus group F1, fF2 is the focal length of the second focus group F2, and fFw is the focal length of the front group LF at the wide-angle end.

[0024] The condition of Expression (1) indicates an appropriate relationship between the focal length fF1 of the first focus group F1 and the focal length fF2 of the second focus group F2. By satisfying the condition of Expression (1), both focus shift and focus breathing during zooming can be reduced. If fF2 / fF1 exceeds the upper limit of Expression (1), the focus sensitivity of the first focus group F1 becomes too high, resulting in a decrease in focusing accuracy, and the effect of correcting the focus breathing of the second focus group F2 decreases, which is not preferable. If fF2 / fF1 is below the lower limit of Expression (1), the focus sensitivity of the first focus group F1 becomes too low, the movement amount of the first focus group F1 increases, and it becomes difficult to shorten the overall length of the zoom lens, which is not preferable.

[0025] Note that in order to reduce focus breathing, it is preferable to move both the first focus group F1 and the second focus group F2 toward the image side when focusing from an infinite object to a closest object.

[0026] The condition of Equation (2) indicates an appropriate relationship between the focal length fFw of the front group LF at the wide-angle end and the focal length fw of the entire zoom lens system at the wide-angle end. By satisfying the condition of Equation (2), the incident angle of the on-axis ray to the aperture stop STO is in the diverging direction, and vignetting is improved throughout the zoom range. Moreover, the change in the chief ray when the aperture stop STO is stopped down, that is, the change in the field angle on the object side, can be reduced. If fFw / fw exceeds the upper limit of Equation (2), the incident ray to the aperture stop STO becomes a converging ray, and the number of lower rays passing through the lower edge of the aperture stop STO becomes too small, which is not preferable. If fFw / fw is below the lower limit of Equation (2), the divergence of the incident ray to the aperture stop STO becomes too weak, resulting in insufficient upper rays or the outer diameter of the aperture stop STO (hereinafter referred to as the stop outer diameter) becoming too large, which is not preferable.

[0027] It is more preferable if the numerical ranges of Equations (1) and (2) are as follows.

[0028] 0.4 ≦ fF2 / fF1 ≦ 1.5 (1a) -2.5 ≦ fFw / fw ≦ -0.5 (2a) It is even more preferable if the numerical ranges of Equations (1) and (2) are as follows.

[0029] 0.6 ≦ fF2 / fF1 ≦ 1.2 (1b) -2.0 ≦ fFw / fw ≦ -1.0 (2b) The zoom lens of each embodiment preferably satisfies at least one of the conditions of the following Equations (3) to (16).

[0030] -6.5 ≦ fFt / ft < 0.0 (3) -2.0 ≦ fF1 / fRa ≦ -0.5 (4) -2.0 ≦ fF1 / fi < 0.0 (5) -2.0 ≦ fF2 / fRb ≦ -0.2 (6) 0.5 ≦ βF1t / βF2t ≦ 3.0 (7) 1.5 ≦ |besF1t| / |besF2t| ≦ 5.0 (8) 0.4 ≦ ST / TTL ≦ 0.7 (9) -30 ≦ fFt / fRt < 0 (10) 0.4 ≦ |mF2w| / |mF1w| ≦ 2.0 (11) 0.3 ≦ |mF2t| / |mF1t| ≦ 2.0 (12) 0.3 ≦ SF2 ≦ 3.0 (13) 1.6 ≦ NdF2 ≦ 2.0 (14) 0.5 ≦ TTL / ft ≦ 1.5 (15) 0.2 ≦ BF / fi ≦ 0.6 (16) In formulas (3) to (16), ft is the focal length of the entire zoom lens system at the telephoto end, fFt is the focal length of the front group LF at the wide-angle end, and fRa is the focal length of the lens group BRa adjacent to the object side in the first focus group F1 among the rear groups LR. fRb is the focal length of the fixed lens group BRb that remains stationary during zooming and focusing and is arranged between the first focus group F1 and the second focus group F2. fi is the focal length of the final lens group Bi, which is the lens group closest to the image side among the zoom lens (rear group LR). βF1t is the imaging magnification of the first focus group F1 at the telephoto end, and βF2t is the imaging magnification of the second focus group F2 at the telephoto end. besF1t is the focus sensitivity of the first focus group F1 at the telephoto end, and besF2t is the focus sensitivity of the second focus group F2 at the telephoto end. ST is the length on the optical axis from the aperture stop STO to the image plane img, and TTL is the length on the optical axis from the surface closest to the object side among the zoom lens (front group LF) to the image plane img (total lens length). mF1w is the movement amount during focusing from an infinite object to a closest object by the first focus group F1 at the wide-angle end, and mF2w is the movement amount during focusing from an infinite object to a closest object by the second focus group F2 at the wide-angle end. mF1t is the movement amount during focusing from an infinite object to a closest object by the first focus group F1 at the telephoto end, and mF2t is the movement amount during focusing from an infinite object to a closest object by the second focus group F2 at the wide-angle end. The movement amount of each focus group is the difference between the position focused on an infinite object and the position focused on a closest object of the focus group. SF2 is the shape factor of one negative lens constituting the second focus group F2, and NdF2 is the refractive index of one negative lens constituting the second focus group F2 at the d line. BF is the back focus of the zoom lens, which is the air-equivalent length on the optical axis from the surface closest to the image side of the zoom lens to the image plane img.

[0031] The condition of Equation (3) shows an appropriate relationship between the focal length fFt of the front group LF at the telephoto end and the overall focal length ft at the wide-angle end. By satisfying the condition of Equation (3), it is possible to reduce the change in the angle of view when the aperture stop STO is stopped down. If fFt / ft exceeds the upper limit of Equation (3), the lower light rays become too few. If it is below the lower limit of Equation (3), the upper light rays passing through the upper edge of the aperture stop STO are insufficient or the outer diameter of the stop becomes large, which is not preferable.

[0032] The condition of Equation (4) shows an appropriate relationship between the focal length fF1 of the first focus group F1 and the focal length fRa of the lens group adjacent to the first focus group F1 on the object side, and particularly shows the preferable focal length of the first focus group F1. If fF1 / fRa exceeds the upper limit of Equation (4), the focal length of the first focus group F1 becomes too long, making it difficult to shorten the closest focusing distance, which is not preferable. If fF1 / fRa is below the lower limit of Equation (4), the focal length of the first focus group F1 becomes too short, resulting in a decrease in focus accuracy, which is not preferable.

[0033] The condition of Equation (5) shows an appropriate relationship between the focal length fF1 of the first focus group F1 and the focal length fi of the lens group Bi on the most image side, and is a condition for obtaining an appropriate back focus. In a telephoto zoom lens, since an extender is often attached to change the focal length range, it is necessary to ensure a sufficient back focus. If fF1 / fi exceeds the upper limit of Equation (5), the focal length of the final lens group Bi becomes too long, making it difficult to miniaturize the first focus group F1, which is not preferable. If fF1 / fi is below the lower limit of Equation (5), the focal length of the first focus group F1 becomes too short, resulting in a decrease in focus accuracy, which is not preferable.

[0034] Also, in order to suppress the lens diameter of the first focus group F1 and reduce the weight, it is preferable that the refractive power of the first focus group F1 is negative and the refractive power of the lens group arranged adjacent to the image side of the first focus group F1 is positive.

[0035] Furthermore, in order to reduce the lens diameter of the second focus group F2 and achieve weight reduction, it is preferable that the refractive power of the second focus group F2 is negative and the refractive power of the lens group adjacent to the second focus group F2 on the image side is positive.

[0036] The condition of Equation (6) shows an appropriate relationship between the focal length fF2 of the second focus group F2 and the focal length fRb of the fixed lens group BRb disposed between the first focus group F1 and the second focus group F2, and is a condition for reducing the lens diameter of the second focus group F2. If fF2 / fRb exceeds the upper limit of Equation (6), the focal length of the lens group BRb is too long, and the effect of miniaturizing the zoom lens is reduced, which is not preferable. If fF2 / fRb is below the lower limit of Equation (6), the focal length of the lens group BRb becomes too short, and it becomes difficult to secure the necessary back focus, which is not preferable.

[0037] The condition of Equation (7) shows an appropriate relationship between the imaging magnification βF1t of the first focus group F1 at the telephoto end and the imaging magnification βF2t of the second focus group F2 at the telephoto end, and is a condition for miniaturizing each focus group while securing sufficient back focus and reducing focus breathing. If βF1t / βF2t exceeds the upper limit of Equation (7), the first focus group F1 and the second focus group F2 approach each other too closely, making it difficult to share the correction of spherical aberration and field curvature, which is not preferable. If βF1t / βF2t is below the lower limit of Equation (7), the lens diameter of the second focus group F2 tends to increase, making it difficult to reduce the weight of the second focus group F2, which is not preferable. In order to satisfy the condition of Equation (7), it is preferable to dispose a lens group between the first focus group F1 and the second focus group F2.

[0038] The condition of Equation (8) shows an appropriate relationship between the focus sensitivity besF1t of the first focus group F1 and the focus sensitivity besF2t of the second focus group F2, and is a condition for improving focus accuracy and focus breathing. The focus sensitivity is expressed by the following equation when the combined imaging magnification of one or more lens groups on the image side from the first focus group F1 at the telephoto end is βF1Rt and the combined imaging magnification of one or more lens groups on the image side from the second focus group F2 at the telephoto end is βF2Rt. The focus sensitivity is the amount of focus change on the image plane with respect to the unit movement amount of the focus group.

[0039] besF1t = (1-βF1t 2 )×βF1Rt 2 besF2t = (1-βF2t 2 )×βF2Rt 2 If |besF1t| / |besF2t| exceeds the upper limit of Equation (8), the focus sensitivity of the first focus group F1 becomes too high. As a result, the focus accuracy due to the error in the stop position of the first focus group F1 is likely to decrease, which is not preferable. If |besF1t| / |besF2t| is below the lower limit of Equation (8), the focus sensitivity of the second focus group F2 becomes too high. As a result, it becomes difficult to reduce focus breathing while suppressing fluctuations in spherical aberration and field curvature accompanying changes in the object distance, which is not preferable.

[0040] The condition of Equation (9) indicates the appropriate position of the aperture stop STO (distance ST from the image plane img) with respect to the overall lens length TTL, and it is a condition for suppressing the angular change of the chief ray when the aperture stop STO is stopped down. If ST / TTL exceeds the upper limit of Equation (9), the aperture stop STO will be located on the image side rather than at the appropriate position, making it likely that the light quantity of the lower light rays will be insufficient at the telephoto end, which is not preferable. If ST / TTL is below the lower limit of Equation (9), the aperture stop STO will be located on the object side rather than at the appropriate position, and the movement amount of each intermediate lens group during zooming will be too small, so it is necessary to increase the power of each intermediate lens group. As a result, the variation in field curvature and spherical aberration associated with zooming is likely to increase, which is not preferable.

[0041] The condition of Equation (10) indicates the appropriate relationship between the focal length fFt of the front group LF at the telephoto end and the focal length fRt of the rear group LR at the telephoto end, and it is a condition for suppressing the outer diameter of the aperture while improving the vignetting. If fFt / fRt exceeds the upper limit of Equation (10), the outer diameter of the aperture can be suppressed, but the vignetting at the telephoto end is likely to increase, which is not preferable. If fFt / fRt is below the lower limit of Equation (10), the vignetting is improved, but the outer diameter of the aperture is likely to increase, which is not preferable.

[0042] Note that by making the focal length of the front group LF negative and the focal length of the rear group LR positive, the on-axis ray is made divergent at the position of the aperture stop STO. Even if the aperture stop STO is arranged on the object side within the rear group LR, its outer diameter can be made less likely to increase.

[0043] Also, it is preferable that the lens group closest to the object side among the intermediate lens groups has a configuration having a positive lens and a negative lens from the object side. Furthermore, it is preferable that the lens group closest to the image side among the intermediate lens groups has a configuration having a positive lens and a negative lens from the object side. By adopting this lens arrangement, the chromatic aberration generated in the intermediate lens groups can be corrected well. Also, by using a lens group having a positive and negative refractive power arrangement from the object side, the principal point position can be moved to the image side, and the overall lens length can be shortened.

[0044] The conditions of Equation (11) and Equation (12) respectively show appropriate relationships between the movement amounts mF1w, mF1t of the first focus group F1 and the movement amounts mF2w, mF2t of the second focus group F2 in focusing at the wide-angle end and the telephoto end. They are conditions for reducing aberration variation and focus breathing with respect to changes in the object distance. If |mF2w| / |mF1w| and |mF2t| / |mF1t| respectively exceed the upper limits of Equation (11) and (12), the movement amount of the second focus group F2 becomes too large, making it difficult to correct spherical aberration, which is not preferable. If |mF2w| / |mF1w| and |mF2t| / |mF1t| respectively fall below the lower limits of Equation (11) and (12), the movement amount of the second focus group F2 becomes too small, making it difficult to correct focus breathing, which is not preferable.

[0045] The condition of Equation (13) shows an appropriate shape factor SF2 of one negative lens constituting the second focus group F2. When the radius of curvature of the object side surface of the negative lens is R1 and the radius of curvature of the image side surface is R2, SF2 is expressed by the following equation.

[0046] SF2=(R2+R1) / (R2-R1) Since the second focus group F2 is arranged at a position close to the image plane, it is necessary to have a shape that reduces ghost light due to reflection at the imaging surface of the imaging device arranged on the imaging surface of the second focus group F2 and the image plane img. If SF2 exceeds the upper limit of Equation (13), the degree of the meniscus shape of the negative lens increases, reducing the focus correction effect of the second focus group F2, which is not preferable. If SF2 is below the lower limit of Equation (13), ghost light mainly caused by reflection between the image side surface of the negative lens and the imaging surface is likely to occur, which is not preferable.

[0047] The condition of Equation (14) shows an appropriate range of the refractive index NdF2 of one negative lens as the second focus group F2. If NdF2 exceeds the upper limit of Equation (14), the Petzval sum of the rear group LR deteriorates, which is not preferable. If NdF2 is below the lower limit of Equation (14), the focus correction effect of the second focus group F2 decreases, which is not preferable.

[0048] The condition of Equation (15) shows an appropriate relationship between the overall lens length TTL and the focal length ft of the entire zoom lens system at the telephoto end. If TTL / ft exceeds the upper limit of Equation (15), it becomes difficult to shorten the overall lens length while suppressing the lens diameter of the first lens group B1, which is not preferable. If TTL / ft is below the lower limit of Equation (15), it becomes difficult to arrange the aperture stop STO at a preferable position while ensuring the necessary zoom ratio, which is not preferable.

[0049] The condition of Equation (16) shows an appropriate relationship between the focal length fi of the final lens group Bi and the back focus BF, and it is a condition for miniaturizing each focus group while enabling the insertion of an extender. If BF / fi is below the lower limit of Equation (16), the refractive power of the final lens group Bi is too weak to obtain a converging effect, and the lens diameter of each focus group becomes large, which is not preferable. If BF / fi exceeds the upper limit of Equation (16), the refractive power of the final lens group Bi is too strong to ensure sufficient back focus, which is not preferable.

[0050] In addition, when an anti-shake group that moves in a direction perpendicular to the optical axis is provided in the zoom lens to correct image blur, it is preferable to use a part of the rear group LR as the anti-shake group. In particular, by moving a part of the lens group BRa adjacent to the object side of the first focus group F1 with respect to the optical axis, it is possible to reduce the weight of the anti-shake group while ensuring good anti-shake performance.

[0051] In the zoom lenses of Examples 1 to 5, the fifth lens group from the object side is divided into a sub-lens group 5a with positive refractive power, a sub-lens group 5b with positive refractive power, and a sub-lens group 5c with positive refractive power, and the sub-lens group 5b is used as the anti-shake group. The zoom lens of Example 6 divides the fourth lens group from the object side into a sub-lens group 4a with positive refractive power, a sub-lens group 4b with positive refractive power, and a sub-lens group 4c with positive refractive power, and the sub-lens group 4b is used as the anti-shake group.

[0052] In addition, the anti-vibration group preferably includes at least a positive lens and a negative lens in order to suppress the occurrence of color shift when moving with respect to the optical axis. Furthermore, by having an aspherical surface, the anti-vibration group can suppress the change in coma aberration during anti-vibration without increasing the number of lens elements.

[0053] When the numerical ranges of formulas (3) to (16) are as follows, it is more preferable.

[0054] -6.0 ≦ fFT / fT ≦ -0.4 (3a) -1.8 ≦ fF1 / fRa ≦ -0.8 (4a) -1.5 ≦ fF1 / fi ≦ -0.2 (5a) -1.0 ≦ fF2 / fRb ≦ -0.4 (6a) 0.75 ≦ βF1t / βF2t ≦ 2.00 (7a) 1.8 ≦ |besF1t| / |besF2t| ≦ 4.0 (8a) 0.45 ≦ ST / TTL ≦ 0.65 (9a) -20.0 ≦ fFt / fRt ≦ -1.5 (10a) 0.6 ≦ |mF2w| / |mF1w| ≦ 1.6 (11a) 0.4 ≦ |mF2t| / |mF1t| ≦ 1.50 (12a) 0.5 ≦ SF2 ≦ 1.5 (13a) 1.7 ≦ NdF2 ≦ 1.9 (14a) 0.6 ≦ TTL / fT ≦ 1.4 (15a) 0.25 ≦ BF / fi ≦ 0.50 (16a) When the numerical ranges of formulas (3) to (16) are as follows, it is even more preferable.

[0055] -5.5 ≦ fFT / fT ≦ -0.8 (3b) -1.5 ≦ fF1 / fRa ≦ -1.0 (4b) -1.0 ≦ fF1 / fi ≦ -0.4 (5b) -0.8 ≦ fF2 / fRb ≦ -0.4 (6b) 0.8 ≦ βF1t / βF2t ≦ 1.5 (7b) 2.0 ≦ |besF1t| / |besF2t| ≦ 3.0 (8b) 0.48 ≤ ST / TTL ≤ 0.60 (9b) -15.0 ≤ fFt / fRt ≤ -2.5 (10b) 0.5 ≤ |mF2w| / |mF1w| ≤ 1.8 (11b) 0.35 ≤ |mF2t| / |mF1t| ≤ 1.20 (12b) 0.8 ≤ SF2 ≤ 1.2 (13b) 1.75 ≤ NdF2 ≤ 1.80 (14b) 0.70 ≤ TTL / fT ≤ 1.35 (15b) 0.30 ≤ BF / fi ≤ 0.40 (16b) Note that a lens group having substantially no refractive power may be disposed on the object side or the image side of the zoom lens of each embodiment.

[0056] Hereinafter, Numerical Examples 1 to 6 of the zoom lens corresponding to each of Embodiments 1 to 6 are shown. In the surface data of each numerical example, the surface number i indicates the order of the surface when counted from the object side. r is the radius of curvature (mm) of the i-th surface counted from the object side, d is the lens thickness or air interval (mm) between the i-th and (i + 1)-th surfaces, nd is the refractive index of the optical material between the i-th and (i + 1)-th surfaces at the d-line. νd is the Abbe number based on the d-line of the optical material between the i-th and (i + 1)-th surfaces. The Abbe number νd based on the d-line is expressed as νd = (Nd - 1) / (NF - NC).

[0057] The effective diameter is the radius (mm) of the region through which the light rays contributing to imaging pass on the i-th lens surface.

[0058] In various data, the focal length and F-number are the values in the state of focusing on an infinitely distant object. The image height indicates the actual image height. BF represents the back focus (mm). The back focus is the distance on the optical axis from the final surface (the surface closest to the image side) of the zoom lens to the paraxial image plane, expressed in terms of the air equivalent length as described above. The overall lens length is the length obtained by adding the back focus to the distance on the optical axis from the frontmost surface (the surface closest to the object side) of the zoom lens to the final surface.

[0059] The "*" attached to the surface number means that the surface has an aspherical shape. The aspherical shape is represented by the following formula when x is the displacement amount from the vertex of the surface in the optical axis direction, y is the height from the optical axis in the direction orthogonal to the optical axis, the direction of light propagation is taken as positive, R is the paraxial curvature radius, K is the conic constant, and A4, A6, A8, A10, A12 are the aspherical coefficients.

[0060] x=(y 2 / R) / [1+{1-(1+K)(y 2 / R 2 )} 1 / 2 +A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 ​Figures 7, 8, 9, 10, 11, and 12 each show the longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lenses of Numerical Examples 1 to 6 at (A) the wide-angle end and (B) the telephoto end. In the spherical aberration diagrams, Fno indicates the F-number, the solid line indicates the spherical aberration at the d-line (wavelength 587.6 nm), the dashed line indicates the spherical aberration at the F-line (486.13 nm), the one-dot chain line indicates the spherical aberration at the C-line (656.27 nm), and the two-dot chain line indicates the spherical aberration at the g-line (435.83 nm). The scale on the horizontal axis is the defocus amount, which is -0.4 to +0.4 [mm]. In the astigmatism diagrams, the solid line S indicates the astigmatism at the sagittal image plane, and the dashed line M indicates the astigmatism at the meridional image plane. The horizontal axis is the same as that for the spherical aberration. The distortion diagram shows the distortion at the d-line. The scale on the horizontal axis is -15 to +15 [%]. The chromatic aberration diagram shows the lateral chromatic aberration at the F-line, C-line, and g-line. The scale on the horizontal axis is the defocus amount, which is -0.05 to +0.05 [mm]. ω is the semi-field angle (°). [Numerical Example 1] Unit: mm Surface data Surface number r d nd νd Effective diameter 1 118.641 1.45 1.74951 35.3 67.72 2 75.807 10.58 1.43875 94.7 66.17 3 -665.627 0.20 65.63 4 74.187 7.71 1.43875 94.7 64.07 5 280.505 (Variable) 63.15 6 71.420 5.82 1.56732 42.8 46.31 7 -798.337 0.20 44.70 8 233.290 1.40 1.65160 58.5 41.82 9 38.096 (Variable) 36.43 10 -74.807 1.40 1.53775 74.7 34.56 11 61.389 (Variable) 33.04 12 52.538 3.55 1.85478 24.8 33.57 13 149.814 3.46 33.25 14 -62.946 1.40 1.59349 67.0 33.21 15 283.696 (Variable) 33.65 16 (Aperture) ∞ 0.40 34.39 17* 31.136 10.95 1.49700 81.5 35.88 18* -70.106 0.20 35.11 19 321.201 1.40 1.77047 29.7 33.74 20 35.344 4.34 32.10 21 69.827 1.05 1.85478 24.8 32.51 22 36.387 6.37 1.80400 46.5 32.14 23 -336.651 0.07 1.58946 30.6 31.90 24* -302.040 3.01 31.89 25 44.773 5.10 1.59522 67.7 30.31 26 -541.557 (Variable) 29.34 27 795.915 2.78 1.92286 20.9 27.23 28 -86.227 1.10 1.62299 58.2 26.99 29 26.939 (Variable) 25.80 30* -154.619 4.65 1.58313 59.4 30.94 31* -41.311 (Variable) 31.40 32 -48.413 1.30 1.77047 29.7 31.25 33 ∞ (Variable) 32.25 34 126.157 3.10 2.00100 29.1 38.91 35 -1961.022 (Variable) 39.01 Image plane ∞ Aspherical data The 17th surface K = 0.00000e+00 A 4=-4.11423e-06 A 6=-4.02996e-10 A 8=-4.42991e-12 A10= 5.14141e-16 The 18th surface K = 0.00000e+00 A 4= 3.38559e-06 A 6=-7.98271e-10 A 8=-3.40353e-12 A10= 4.45865e-15 The 24th surface K = 0.00000e+00 A 4= 5.60156e-07 A 6= 5.19683e-10 A 8=-2.15534e-13 A10=-1.04557e-15 The 30th surface K = 0.00000e+00 A 4= 7.95991e-06 A 6=-1.42359e-08 A 8= 1.09768e-10 A10=-4.12759e-13 A12= 5.90882e-16 The 31st surface K = 0.00000e+00 A 4= 6.06354e-06 A 6=-1.52294e-08 A 8= 1.08850e-10 A10=-4.00403e-13 A12= 5.48878e-16 Various data Zoom ratio 2.69 Wide angle, middle, telephoto Focal length 72.00 120.07 194.00 F-number 2.90 2.90 2.90 Half field angle (°) 16.72 10.21 6.36 Image height 21.64 21.64 21.64 Overall lens length 217.10 217.10 217.10 BF 37.13 37.13 37.13 d 5 1.48 24.67 42.97 d 9 8.46 10.54 13.14 d11 20.31 8.04 1.81 d15 31.22 18.22 3.55 d26 1.88 2.65 1.54 d29 18.60 17.83 18.94 d31 5.56 6.75 2.28 d33 9.48 8.29 12.76 d35 37.13 37.13 37.13 Entrance pupil position 87.99 147.59 199.11 Exit pupil position -80.55 -77.00 -88.84 Front principal point position 115.94 141.34 94.34 Rear principal point position -34.87 -82.94 -156.87 Lens group data Group Starting surface Focal length Lens configuration length Front principal point position Rear principal point position 1 1 138.69 19.94 4.25 -9.53 2 6 -197.36 7.42 13.35 8.06 3 10 -62.48 1.40 0.50 -0.41 4 12 86681.55 8.41 -6517.96 -6068.02 5 16 37.05 32.89 13.85 -13.35 6 27 -54.40 3.88 2.39 0.26 7 30 95.23 4.65 3.95 1.05 8 32 -62.84 1.30 -0.00 -0.73 9 34 118.50 3.10 0.09 -1.46 Single lens data Lens Starting surface Focal length 1 1 -284.27 2 2 155.79 3 4 227.30 4 6 115.83 5 8 -70.07 6 10 -62.48 7 12 93.09 8 14 -86.67 9 17 45.00 10 19 -51.66 11 21 -90.20 12 22 41.16 13 23 4980.24 14 25 69.70 15 27 84.43 16 28 -32.83 17 30 95.23 18 32 -62.84 19 34 118.50 [Numerical Example 2] Unit: mm Surface data Surface number r d nd νd Effective diameter 1 114.373 1.40 1.90366 31.3 65.03 2 83.254 9.20 1.43875 94.7 63.81 3 -687.171 0.20 63.24 4 72.870 7.55 1.43875 94.7 60.01 5 372.512 (Variable) 58.77 6 188.724 3.60 1.72047 34.7 41.43 7 -294.244 0.20 40.01 8 774.429 1.40 1.72916 54.7 37.87 9 36.916 (Variable) 33.22 10 -56.442 1.40 1.53775 74.7 31.54 11 154.766 (Variable) 31.97 12 67.137 3.90 1.85478 24.8 32.88 13 -294.768 2.25 32.80 14 -54.934 1.40 1.61340 44.3 32.76 15 213.549 (Variable) 33.28 16 (Aperture) ∞ 2.10 33.98 17* 29.294 10.00 1.49700 81.5 36.33 18* -74.795 1.58 35.80 19 132.142 1.40 1.77047 29.7 33.37 20 31.454 4.85 31.48 21 71.942 1.05 1.85478 24.8 31.81 22 36.789 6.00 1.80400 46.5 31.43 23 -473.050 0.07 1.58946 30.6 31.18 24* -424.100 1.95 31.17 25 42.310 4.75 1.59522 67.7 29.91 26 -1172.836 (Variable) 29.07 27 233.568 2.80 1.92286 20.9 26.49 28 -97.675 1.10 1.70300 52.4 25.97 29 28.249 (Variable) 24.95 30* -88.284 4.50 1.58313 59.4 29.99 31* -33.732 (Variable) 30.39 32 -45.317 1.30 1.77047 29.7 30.30 33 ∞ (Variable) 31.42 34 75.461 3.10 2.00100 29.1 38.00 35 212.837 (Variable) 37.97 Image plane ∞ Aspherical data The 17th surface K = 0.00000e+00 A 4=-4.73081e-06 A 6=-9.47473e-10 A 8=-3.88020e-12 A10=-3.54263e-15 The 18th surface K = 0.00000e+00 A 4= 3.21449e-06 A 6=-4.15483e-11 A 8=-4.31937e-12 A10= 4.21989e-15 The 24th surface K = 0.00000e+00 A 4= 4.20899e-07 A 6= 3.18000e-10 A 8= 5.69604e-13 A10=-2.62648e-15 The 30th surface K = 0.00000e+00 A 4= 1.07860e-05 A 6=-1.03082e-08 A 8= 1.31462e-10 A10=-3.35533e-13 A12= 6.90525e-16 The 31st surface K = 0.00000e+00 A 4= 1.01449e-05 A 6=-6.86964e-09 A 8= 1.02439e-10 A10=-2.54359e-13 A12= 6.58551e-16 Various data Zoom ratio 3.00 Wide angle, medium, telephoto Focal length 60.00 119.96 180.00 F-number 2.90 2.90 2.90 Half field angle (°) 19.83 10.22 6.85 Image height 21.64 21.64 21.64 Overall lens length 210.00 210.00 210.00 BF 37.12 37.12 37.12 d 5 1.52 31.86 47.37 d 9 8.20 9.28 8.47 d11 13.80 3.81 1.48 d15 36.95 15.51 3.15 d26 1.50 3.49 2.61 d29 19.16 17.17 18.05 d31 3.32 5.78 2.49 d33 9.38 6.93 10.22 d35 37.12 37.12 37.12 Entrance pupil position 67.95 141.27 182.71 Exit pupil position -79.66 -71.84 -80.38 Front principal point position 97.13 129.15 86.98 Rear principal point position -22.88 -82.84 -142.88 Lens group data Group Starting surface Focal length Lens configuration length Front principal point position Rear principal point position 1 1 128.72 18.35 3.89 -8.75 2 6 -81.46 5.20 4.39 1.23 3 10 -76.73 1.40 0.24 -0.67 4 12 417.63 7.55 -23.95 -27.61 5 16 36.64 33.75 14.95 -14.10 6 27 -54.19 3.90 2.65 0.53 7 30 90.86 4.50 4.46 1.71 8 32 -58.82 1.30 -0.00 -0.73 9 34 115.49 3.10 -0.84 -2.37 Single lens data Lens Starting surface Focal length 1 1 -345.99 2 2 169.87 3 4 204.90 4 6 160.09 5 8 -53.20 6 10 -76.73 7 12 64.29 8 14 -71.09 9 17 43.75 10 19 -53.90 11 21 -89.31 12 22 42.68 13 23 6949.10 14 25 68.71 15 27 74.93 16 28 -31.06 17 30 90.86 18 32 -58.82 19 34 115.49 [Numerical Example 3] Unit: mm Surface Data Surface Number r d nd νd Effective Diameter 1 172.753 2.10 1.89190 37.1 100.34 2 110.864 16.40 1.43875 94.7 98.59 3 -669.069 0.30 98.38 4 110.587 11.20 1.43875 94.7 96.23 5 431.001 (Variable) 95.11 6 192.334 6.30 1.74951 35.3 63.66 7 -467.535 0.30 62.57 8 -1438.668 2.10 1.51742 52.4 61.66 9 68.833 (Variable) 56.97 10 -108.485 2.10 1.53775 74.7 45.95 11 115.605 (Variable) 45.41 12 70.118 5.40 1.85478 24.8 45.69 13 243.257 2.53 45.00 14 -191.736 2.10 1.61340 44.3 44.95 15 104.468 (Variable) 44.30 16 (Aperture) ∞ 0.40 44.52 17* 48.817 10.20 1.49700 81.5 45.00 18* -135.473 9.25 44.21 19 4215.717 2.10 1.77047 29.7 38.90 20 48.855 11.75 37.44 21 85.709 1.57 1.85478 24.8 39.40 22 44.786 8.70 1.80400 46.5 38.96 23 -304.217 0.10 1.58946 30.6 38.62 24* -265.675 1.00 38.61 25 55.204 5.00 1.59522 67.7 37.29 26 400.814 (Variable) 36.35 27 1772.602 4.20 1.92286 20.9 32.88 28 -101.531 1.65 1.70300 52.4 32.47 29 37.887 (Variable) 31.18 30* -1039.603 5.90 1.58313 59.4 38.59 31* -52.894 (Variable) 38.77 32 -56.554 1.95 1.77047 29.7 37.42 33 ∞ (Variable) 38.45 34 87.148 4.20 2.00100 29.1 45.44 35 322.866 (Variable) 45.25 Image plane ∞ Aspherical data The 17th surface K = 0.00000e+00 A 4=-8.52024e-07 A 6=-4.15328e-10 A 8= 9.29658e-14 A10=-5.44870e-16 The 18th surface K = 0.00000e+00 A 4= 4.68123e-07 A 6=-3.73033e-10 A 8= 8.15517e-14 A10=-2.75722e-16 The 24th surface K = 0.00000e+00 A 4= 3.55470e-07 A 6= 1.31857e-10 A 8=-1.95555e-14 A10=-2.25525e-16 The 30th surface K = 0.00000e+00 A 4= 2.11329e-06 A 6= 2.02480e-10 A 8= 1.84288e-11 A10=-5.61258e-14 A12= 9.40795e-17 The 31st surface K = 0.00000e+00 A 4= 1.34443e-06 A 6=-2.32714e-09 A 8= 2.98680e-11 A10=-8.65384e-14 A12= 1.25435e-16 Various data Zoom ratio 2.91 Wide angle, medium, telephoto Focal length 100.00 185.26 291.00 F-number 2.90 2.88 2.90 Half field angle (°) 12.21 6.66 4.25 Image height 21.64 21.64 21.64 Overall lens length 320.20 320.20 320.20 BF 37.14 37.14 37.14 d 5 1.48 42.15 65.62 d 9 21.10 30.28 38.63 d11 41.33 11.62 1.49 d15 46.71 26.58 4.88 d26 8.96 7.41 1.76 d29 21.03 22.59 28.23 d31 14.97 14.31 7.17 d33 8.67 9.33 16.46 d35 37.14 37.14 37.14 Entrance pupil position 152.02 281.50 363.03 Exit pupil position -134.29 -140.79 -195.97 Front principal point position 193.69 273.88 290.77 Rear principal point position -62.86 -148.11 -253.86 Lens group data Group Start surface Focal length Lens configuration length Front principal point position Rear principal point position 1 1 213.61 30.00 7.29 -13.38 2 6 -449.97 8.70 15.88 10.24 3 10 -103.73 2.10 0.66 -0.70 4 12 3347.99 10.03 -226.57 -218.59 5 16 58.80 50.08 29.60 -20.05 6 27 -63.28 5.85 3.40 0.24 7 30 95.36 5.90 3.92 0.20 8 32 -73.40 1.95 -0.00 -1.10 9 34 118.19 4.20 -0.77 -2.85 Single lens data Lens Start surface Focal length 1 1 -352.60 2 2 218.16 3 4 335.47 4 6 182.57 5 8 -126.90 6 10 -103.73 7 12 113.62 8 14 -109.95 9 17 73.56 10 19 -64.17 11 21 -111.72 12 22 49.10 13 23 3553.87 14 25 106.98 15 27 104.17 16 28 -39.06 17 30 95.36 18 32 -73.40 19 34 118.19 [Numerical Example 4] Unit: mm Surface data Surface number r d nd νd Effective diameter 1 184.967 2.30 1.89190 37.1 96.34 2 114.981 14.00 1.43875 94.7 94.79 3 -1238.511 0.20 94.64 4 107.157 11.50 1.43875 94.7 93.34 5 538.899 (Variable) 92.34 6 545.415 3.20 1.72047 34.7 68.49 7 -1145.045 16.60 67.99 8 250.430 3.00 1.77250 49.6 56.80 9 116.759 (Variable) 54.79 10 -107.629 2.00 1.53775 74.7 43.62 11 110.642 (Variable) 42.97 12 74.737 5.50 1.85478 24.8 43.11 13 1551.268 1.28 42.51 14 -215.491 2.00 1.80400 46.6 42.47 15 104.892 (Variable) 41.71 16 (Aperture) ∞ 0.40 41.86 17* 98.698 7.50 1.43875 94.7 42.00 18* -83.153 12.41 41.81 19 -1305.936 2.00 1.77047 29.7 37.91 20 63.691 10.60 37.31 21 94.885 1.80 1.85478 24.8 39.94 22 47.782 8.68 1.80400 46.5 39.71 23 -274.151 0.07 1.58946 30.6 39.58 24* -257.021 3.00 39.58 25 76.973 5.20 1.49700 81.5 38.50 26 -228.030 (Variable) 37.94 27 -415.039 3.60 1.92286 20.9 32.70 28 -102.980 1.50 1.59522 67.7 32.00 29 48.936 (Variable) 30.02 30* -119.435 4.00 1.58313 59.4 33.40 31* -46.042 (Variable) 33.67 32 -53.950 2.00 1.77047 29.7 32.03 33 ∞ (Variable) 32.79 34 95.445 3.50 2.00069 25.5 45.27 35 305.293 (Variable) 45.11 Image plane ∞ Aspherical data The 17th surface K = 0.00000e+00 A 4=-8.11761e-07 A 6=-3.11349e-10 A 8=-5.54235e-13 A10= 9.06329e-16 The 18th surface K = 0.00000e+00 A 4= 2.46153e-08 A 6=-5.32016e-10 A 8=-1.22159e-13 A10= 6.27543e-16 The 24th surface K = 0.00000e+00 A 4= 2.66397e-07 A 6= 2.59983e-10 A 8=-5.24974e-13 A10= 3.52651e-16 The 30th surface K = 0.00000e+00 A 4= 1.42270e-06 A 6= 4.66364e-09 A 8= 1.24821e-12 A10=-3.80692e-14 A12= 9.18092e-17 The 31st surface K = 0.00000e+00 A 4= 1.21595e-06 A 6= 4.54091e-09 A 8= 8.58489e-13 A10=-3.23705e-14 A12= 8.09394e-17 Various data Zoom ratio 1.93 Focal length 205.00 300.19 395.00 249.88 349.91 F-number 4.10 4.07 4.10 4.07 4.08 Half field angle (°) 6.02 4.12 3.14 4.95 3.54 Image height 21.64 21.64 21.64 21.64 21.64 Overall lens length 350.00 350.00 350.00 350.00 350.00 BF 43.54 43.54 43.54 43.54 43.54 d 5 5.03 32.32 54.04 19.32 43.98 d 9 34.32 35.97 33.79 35.49 35.21 d11 24.73 7.01 1.50 12.72 2.65 d15 29.84 18.62 4.59 26.38 12.09 d26 13.37 8.40 1.49 11.21 5.06 d29 24.44 29.40 36.32 26.60 32.74 d31 18.52 15.48 8.80 17.79 12.23 d33 28.38 31.42 38.10 29.11 34.67 d35 43.54 43.54 43.54 43.54 43.54 Entrance pupil position 232.87 311.22 350.47 275.38 336.81 Exit pupil position -199.79 -228.05 -298.41 -208.04 -259.06 Front principal point position 265.16 279.60 289.19 277.07 282.11 Rear principal point position -161.46 -256.65 -351.46 -206.34 -306.37 Lens group data Group Starting surface Focal length Lens configuration length Front principal point position Rear principal point position 1 1 221.30 28.00 6.55 -12.65 2 6 -711.84 22.80 53.03 30.71 3 10 -101.13 2.00 0.64 -0.66 4 12 8523.32 8.78 -500.49 -477.81 5 16 66.50 51.65 33.51 -16.32 6 27 -89.03 5.10 2.51 -0.29 7 30 125.96 4.00 4.03 1.55 8 32 -70.02 2.00 -0.00 -1.13 9 34 137.61 3.50 -0.79 -2.52 Single lens data Lens starting surface Focal length 1 1 -346.08 2 2 240.56 3 4 302.39 4 6 513.19 5 8 -285.96 6 10 -101.13 7 12 91.70 8 14 -87.51 9 17 104.17 10 19 -78.77 11 21 -114.63 12 22 51.23 13 23 6967.51 14 25 116.45 15 27 147.59 16 28 -55.53 17 30 125.96 18 32 -70.02 19 34 137.61 [Numerical example 5] Unit: mm Surface data Surface number r d nd νd Effective diameter 1 220.924 2.30 1.89190 37.1 86.09 2 122.179 11.90 1.43875 94.7 85.02 3 -604.088 0.20 84.98 4 104.403 10.70 1.43875 94.7 84.11 5 846.907 (Variable) 83.19 6 463.042 3.20 1.86966 20.0 54.82 7 -1680.439 10.93 54.22 8 311.700 2.50 1.96300 24.1 47.43 9 148.755 (Variable) 46.21 10 -180.458 2.00 1.53775 74.7 39.96 11 84.993 (Variable) 39.01 12 67.245 4.70 1.85478 24.8 38.95 13 204.581 1.93 38.18 14 -203.975 2.00 1.77250 49.6 38.13 15 112.360 (Variable) 37.58 16 (Aperture) ∞ 0.93 37.69 17* 63.256 7.50 1.43875 94.7 37.86 18* -102.807 18.84 37.41 19 435.031 2.00 1.77047 29.7 31.56 20 52.815 5.40 30.84 21 100.912 1.80 1.85478 24.8 31.50 22 58.660 4.00 1.80400 46.5 31.32 23 2875.153 0.07 1.58946 30.6 31.23 24* 3462.436 3.00 31.22 25 73.524 4.00 1.53172 48.8 30.85 26 -263.703 (Variable) 30.46 27 -30268.917 2.00 1.92286 20.9 25.56 28 -180.650 1.50 1.59522 67.7 25.19 29 46.455 (Variable) 24.05 30* -202.629 4.00 1.51742 52.4 29.91 31* -48.359 (Variable) 29.98 32 -46.434 2.00 1.77047 29.7 29.44 33 ∞ (Variable) 30.35 34 116.221 4.50 2.00069 25.5 47.77 35 -942.807 (Variable) 47.71 Image plane ∞ Aspherical data 17th surface K = 0.00000e+00 A 4=-5.28875e-07 A 6= 2.50706e-10 A 8=-1.82712e-12 A10= 1.86109e-15 18th surface K = 0.00000e+00 A 4= 3.89908e-07 A 6= 1.92869e-10 A 8=-1.90820e-12 A10= 2.20542e-15 24th surface K = 0.00000e+00 A 4= 8.95598e-08 A 6= 2.11795e-10 A 8=-2.48501e-13 A10=-2.29274e-16 30th surface K = 0.00000e+00 A 4= 3.31118e-06 A 6= 1.34769e-08 A 8= 1.55479e-11 A10=-6.82790e-14 A12= 5.04607e-16 31st surface K = 0.00000e+00 A 4= 2.02798e-06 A 6= 1.40695e-08 A 8= 1.16908e-11 A10=-7.37995e-14 A12= 5.64000e-16 Various data Zoom ratio 2.41 Wide angle Middle Telephoto Focal length 205.00 300.08 495.00 F-number 5.75 5.70 5.75 Half Angle (°) 6.02 4.12 2.50 Image Height 21.64 21.64 21.64 Overall Lens Length 350.00 350.00 350.00 BF 37.96 37.96 37.96 d5 1.87 28.08 67.87 d9 19.00 23.07 18.58 d11 17.47 3.54 2.82 d15 55.02 38.67 4.08 d26 22.25 17.63 1.49 d29 33.80 38.42 54.56 d31 20.68 17.51 3.95 d33 28.05 31.23 44.78 d35 37.96 37.96 37.96 Entrance Pupil Position 174.37 246.93 316.03 Exit Pupil Position -322.30 -404.51 -2267.76 Front Principal Point Position 262.71 343.49 704.76 Rear Principal Point Position -167.04 -262.12 -457.04 Lens Group Data Group Starting Surface Focal Length Lens Configuration Length Front Principal Point Position Rear Principal Point Position 1 1 210.87 25.10 7.29 -9.90 2 6 -1181.55 16.63 58.81 42.82 3 10 -107.16 2.00 0.88 -0.42 4 12 -697.76 8.63 46.33 38.15 5 16 75.29 47.54 23.03 -25.80 6 27 -90.84 3.50 2.13 0.15 7 30 121.69 4.00 3.43 0.82 8 32 -60.27 2.00 -0.00 -1.13 9 34 103.62 4.50 0.25 -2.01 Single lens data Lens starting surface Focal length 1 1 -309.89 2 2 232.79 3 4 270.23 4 6 417.71 5 8 -297.73 6 10 -107.16 7 12 115.37 8 14 -93.53 9 17 90.50 10 19 -78.20 11 21 -167.19 12 22 74.43 13 23 28755.34 14 25 108.58 15 27 196.92 16 28 -61.93 17 30 121.69 18 32 -60.27 19 34 103.62 [Numerical example 6] Unit: mm Surface data Surface number r d nd νd Effective diameter 1 105.360 1.40 1.90043 37.4 59.57 2 69.455 8.90 1.43875 94.7 58.08 3 -868.468 0.20 57.50 4 61.830 8.00 1.43875 94.7 54.43 5 559.753 (Variable) 53.04 6 277.126 2.85 1.74951 35.3 37.90 7 -332.438 0.20 36.58 8 186.764 1.00 1.65160 58.5 33.80 9 28.661 7.06 29.40 10 -49.587 1.40 1.53775 74.7 28.58 11 98.790 (Variable) 28.76 12 49.722 4.20 1.85478 24.8 29.91 13 -403.947 2.17 29.83 14 -50.730 1.20 1.70154 41.2 29.79 15 231.172 (Variable) 30.42 16 (Aperture) ∞ 2.00 31.34 17* 28.174 9.50 1.49700 81.5 33.97 18* -72.384 1.50 33.53 19 82.780 1.40 1.77047 29.7 31.38 20 29.103 6.50 29.70 21 69.705 1.05 1.85478 24.8 30.26 22 35.448 5.75 1.80400 46.5 29.91 23 -341.147 0.07 1.58946 30.6 29.68 24* -314.258 2.30 29.67 25 42.116 4.60 1.59522 67.7 28.34 26 -927.195 (Variable) 27.46 27 240.406 2.40 1.92286 20.9 24.63 28 -124.672 1.10 1.69930 51.1 24.19 29 26.724 (Variable) 23.51 30* -79.617 5.05 1.58313 59.4 28.76 31* -28.066 (Variable) 29.64 32 -39.959 1.30 1.77047 29.7 29.59 33 ∞ (variable) 30.96 34 72.168 3.30 2.00100 29.1 37.06 35 259.884 (variable) 37.08 Image plane ∞ Aspherical data 17th surface K = 0.00000e+00 A 4=-6.16263e-06 A 6=-1.53474e-09 A 8=-2.43584e-12 A10=-1.40767e-14 18th surface K = 0.00000e+00 A 4= 3.35678e-06 A 6=-1.23348e-09 A 8=-4.73723e-13 A10=-5.30385e-15 24th surface K = 0.00000e+00 A 4= 4.39197e-07 A 6= 7.06441e-10 A 8= 6.93958e-13 A10=-5.53266e-15 30th surface K = 0.00000e+00 A 4= 8.42547e-06 A 6=-3.26153e-08 A 8= 2.30852e-10 A10=-7.80280e-13 A12= 3.43929e-16 31st surface K = 0.00000e+00 A 4= 9.03474e-06 A 6=-2.14445e-08 A 8= 1.16123e-10 A10=-1.92604e-13 A12=-6.31632e-16 Various data Zoom ratio 2.61 Wide angle Middle Telephoto Focal length 56.00 100.15 146.00 F-number 2.90 2.90 2.90 Half drawing angle (°) 21.12 12.19 8.43 Image height 21.64 21.64 21.64 Overall lens length 195.00 195.00 195.00 BF 37.12 37.12 37.12 d5 1.48 24.29 36.74 d11 9.95 2.96 1.20 d15 29.51 13.68 3.00 d26 1.00 3.96 5.20 d29 19.52 16.57 15.32 d31 2.17 4.13 2.36 d33 7.84 5.88 7.65 d35 37.12 37.12 37.12 Entrance pupil position 58.50 107.04 135.00 Exit pupil position -90.36 -79.47 -82.76 Front principal point position 89.90 121.17 103.19 Rear principal point position -18.88 -63.03 -108.88 Lens group data Group Starting surface Focal length Lens configuration length Front principal point position Rear principal point position 1 1 115.32 18.50 4.57 -8.19 2 6 -31.31 12.51 6.59 -3.52 3 12 267.60 7.57 -19.31 -22.83 4 16 34.09 34.67 16.47 -14.81 5 27 -49.20 3.50 2.33 0.41 6 30 71.74 5.05 4.75 1.68 7 32 -51.86 1.30 -0.00 -0.73 8 34 98.94 3.30 -0.63 -2.26 Single lens data Lens start surface focal length 1 1 -230.61 2 2 147.01 3 4 157.65 4 6 202.05 5 8 -52.09 6 10 -61.19 7 12 52.02 8 14 -59.20 9 17 42.13 10 19 -58.92 11 21 -85.59 12 22 40.21 13 23 6757.25 14 25 67.80 15 27 89.24 16 28 -31.38 17 30 71.74 18 32 -51.86 19 34 98.94 The values of formulas (1) to (16) in each numerical example are summarized in Table 1 below. Table 2 shows the change (%) in the size of the shooting range on the subject side in the state of focusing on an infinite object and the state of focusing on a closest object at the wide-angle end (WIDE), the middle zoom position (MIDDLE), and the telephoto end (TELE) when the object distance is 3000 mm and the F value is 22. Further, Table 3 shows the half angle of view (°) in the state of focusing on an infinite object and the state of focusing on a closest object.

[0061]

Table 1

[0062]

Table 2

[0063]

Table 3

[0064] [Imaging device] FIG. 13 shows a digital still camera as an imaging device using the zoom lens of each of the above embodiments as an imaging optical system. 20 is a camera body, and 21 is an imaging optical system composed of a zoom lens according to any one of Embodiments 1 to 6. 22 is an imaging element such as a CCD sensor or a CMOS sensor built in the camera body 20 and imaging an optical image (subject image) formed by the imaging optical system 21. 23 is a recording unit that records image data generated by processing an imaging signal from the imaging element 22, and 24 is a rear display that displays the image data.

[0065] By using the zoom lens of each embodiment, a camera having a small size, a light weight, and high optical performance can be obtained. Note that the camera may be a single-lens reflex camera having a quick-return mirror, or a mirrorless camera not having a quick-return mirror.

[0066] The above embodiments include the following configurations. [Configuration 1] A front group composed of a plurality of intermediate lens groups including a first lens group having a positive refractive power and one or more lens groups having a negative refractive power, which are arranged in order from the object side to the image side, and a rear group composed of an aperture stop and a plurality of lens groups. The zoom lens, When zooming from the wide-angle end to the telephoto end, the most object-side lens group in the first lens group and the rear group is stationary, and each of the plurality of intermediate lens groups moves toward the image side so that the distance between adjacent lens groups among the lens groups included in the front group and the most object-side lens group in the rear group changes, The rear group includes a first focus lens group that moves respectively during focusing and a second focus lens group arranged on the image side of the first focus lens group, When the focal length of the first focus lens group is fF1, the focal length of the second focus lens group is fF2, the focal length of the front group at the wide-angle end is fFw, and the focal length of the zoom lens at the wide-angle end is fw, 0.2 ≦ fF2 / fF1 ≦ 2.0 -3 ≦ fFw / fw < 0 A zoom lens characterized by satisfying the following conditions. [Configuration 2] The aperture stop is arranged closest to the object side in the rear lens group, and the zoom lens according to Configuration 1 is characterized in that. [Configuration 3] When focusing from an infinite object to a closest object, the first focus lens group and the second focus lens group each move toward the image side, and the zoom lens according to Configuration 1 or 2 is characterized in that. [Configuration 4] When the focal length of the zoom lens at the telephoto end is ft and the focal length of the front lens group at the telephoto end is fFt, -6.5 ≦ fFt / ft < 0.0 A zoom lens according to any one of Configurations 1 to 3, characterized by satisfying the following conditions. [Configuration 5] When the focal length of the lens group adjacent to the first focus lens group on the object side in the rear lens group is fRa, -2.0 ≦ fF1 / fRa ≦ -0.5 A zoom lens according to any one of Configurations 1 to 4, characterized by satisfying the following conditions. [Configuration 6] The final lens group closest to the image side in the rear lens group is stationary during zooming and focusing, When the focal length of the final lens group is fi, -2.0 ≦ fF1 / fi < 0.0 A zoom lens according to any one of Configurations 1 to 5, characterized by satisfying the following conditions. [Configuration 7] A fixed lens group that is stationary during zooming and focusing is arranged between the first focus lens group and the second focus lens group, When the focal length of the second focus lens group is f2 and the focal length of the fixed lens group is fRb, -2.0 ≦ fF2 / fRb ≦ -0.2 The zoom lens according to any one of Configurations 1 to 6, characterized by satisfying the following conditions. [Configuration 8] When the imaging magnification of the first focus lens group at the telephoto end is βF1t and the imaging magnification of the second focus lens group at the telephoto end is βF2t, 0.5 ≦ βF1t / βF2t ≦ 3.0 The zoom lens according to any one of Configurations 1 to 7, characterized by satisfying the following conditions. [Configuration 9] Let the focus sensitivity of the first focus lens group at the telephoto end be besF1t, the focus sensitivity of the second focus lens group at the telephoto end be besF2t, the imaging magnification of the first focus lens group at the telephoto end be βF1t, the combined imaging magnification of one or more lens groups on the image side of the first focus lens group at the telephoto end be βF1Rt, the imaging magnification of the second focus lens group at the telephoto end be βF2t, and the combined imaging magnification of one or more lens groups on the image side of the second focus lens group at the telephoto end be βF2Rt. besF1t = (1 - βF1t 2 ) × βF1Rt 2 besF2t = (1 - βF2t 2 ) × βF2Rt 2 When 1.5 ≦ |besF1t| / |besF2t| ≦ 5.0 The zoom lens according to any one of Configurations 1 to 8, characterized by satisfying the following conditions. [Configuration 10] When the length on the optical axis from the aperture stop to the image plane is ST and the length on the optical axis from the most object-side surface of the zoom lens to the image plane is TTL, 0.4 ≦ ST / TTL ≦ 0.7 The zoom lens according to any one of Configurations 1 to 9, characterized by satisfying the following conditions. [Configuration 11] When the focal length of the front group at the telephoto end is fFt and the focal length of the rear group at the telephoto end is fRt, -30 ≦ fFt / fRt < 0 The zoom lens according to any one of Configurations 1 to 10, characterized by satisfying the following conditions. [Configuration 12] When the movement amount of the first focusing lens group from an infinite object to a closest object during focusing at the wide-angle end is mF1w, and the movement amount of the second focusing lens group from an infinite object to a closest object during focusing at the wide-angle end is mF2w, 0.4 ≦ |mF2w| / |mF1w| ≦ 2.0 The zoom lens according to any one of Configurations 1 to 11, characterized by satisfying the following conditions. [Configuration 13] When the movement amount of the first focusing lens group from an infinite object to a closest object during focusing at the telephoto end is mF1t, and the movement amount of the second focusing lens group from an infinite object to a closest object during focusing at the telephoto end is mF2t, 0.3 ≦ |mF2t| / |mF1t| ≦ 2.0 The zoom lens according to any one of Configurations 1 to 12, characterized by satisfying the following conditions. [Configuration 14] The second focusing lens group is composed of one negative lens, Let the radius of curvature of the object-side surface of the negative lens be R1, and the radius of curvature of the image-side surface of the negative lens be R2, SF2 = (R2 + R1) / (R2 - R1) When, 0.3 ≦ SF2 ≦ 3.0 The zoom lens according to any one of Configurations 1 to 13, characterized by satisfying the following conditions. [Configuration 15] The second focusing lens group is composed of one negative lens, When the refractive index of the negative lens at the d line is NdF2, 1.6 ≦ NdF2 ≦ 2.0 The zoom lens according to any one of Configurations 1 to 14, characterized by satisfying the following conditions. [Configuration 16] When the focal length of the zoom lens at the telephoto end is ft and the length on the optical axis from the surface closest to the object side to the image plane in the zoom lens is TTL, 0.5 ≤ TTL / ft ≤ 1.5 The zoom lens according to any one of Configurations 1 to 15, characterized by satisfying the condition. [Configuration 17] When the back focus of the zoom lens is BF and the focal length of the final lens group closest to the image side in the zoom lens is fi, 0.2 ≤ BF / fi ≤ 0.6 The zoom lens according to any one of Configurations 1 to 16, characterized by satisfying the condition. [Configuration 18] The zoom lens according to any one of Configurations 1 to 17, characterized in that the lens group closest to the object side among the plurality of intermediate lens groups has a positive lens and a negative lens from the object side. [Configuration 19] The zoom lens according to any one of Configurations 1 to 18, characterized in that the lens group closest to the image side among the plurality of intermediate lens groups has a positive lens and a negative lens from the object side. [Configuration 20] The zoom lens according to any one of Configurations 1 to 19, characterized in that a part of the rear group moves with respect to the optical axis as an anti-vibration group. [Configuration 21] As the plurality of intermediate lens groups, having a second lens group with a negative refractive power, a third lens group with a negative refractive power, and a fourth lens group with a positive refractive power, arranged in order from the object side to the image side, As the plurality of lens groups constituting the rear group, having a fifth lens group with a positive refractive power, a sixth lens group with a negative refractive power as the first focus lens group, a seventh lens group with a positive refractive power, an eighth lens group with a negative refractive power as the second focus lens group, and a ninth lens group with a positive refractive power, arranged in order from the object side to the image side. The zoom lens according to any one of Configurations 1 to 20, characterized by having the above structure. [Configuration 22] As the plurality of intermediate lens groups, there are a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with negative refractive power, which are arranged in order from the object side to the image side. As the plurality of lens groups constituting the rear group, there are a fifth lens group with positive refractive power, a sixth lens group with negative refractive power as the first focus lens group, a seventh lens group with positive refractive power, an eighth lens group with negative refractive power as the second focus lens group, and a ninth lens group with positive refractive power, which are arranged in order from the object side to the image side. The zoom lens according to any one of Configurations 1 to 20, characterized in that it has these. [Configuration 23] As the plurality of intermediate lens groups, there are a second lens group with negative refractive power and a third lens group with positive refractive power, which are arranged in order from the object side to the image side. As the plurality of lens groups constituting the rear group, there are a fourth lens group with positive refractive power, a fifth lens group with negative refractive power as the first focus lens group, a sixth lens group with positive refractive power, a seventh lens group with negative refractive power as the second focus lens group, and an eighth lens group with positive refractive power, which are arranged in order from the object side to the image side. The zoom lens according to any one of Configurations 1 to 20, characterized in that it has these. [Configuration 24] A zoom lens according to any one of Configurations 1 to 23, An imaging device, characterized in that it has an imaging element that images a subject through the zoom lens.

[0067] Each of the embodiments described above is merely a representative example, and various modifications and changes can be made to each embodiment when implementing the present invention.

Explanation of Reference Numerals

[0068] LF Front group LR Rear group Bi i-th lens group F1 First focus lens group F2 Second focus lens group STO Aperture stop img Image plane

Claims

1. A front group composed of a plurality of intermediate lens groups including a first lens group with positive refractive power and one or more lens groups with negative refractive power, arranged in order from the object side to the image side, and a rear group composed of an aperture stop and a plurality of lens groups, wherein the zoom lens is such that: During zooming from the wide-angle end to the telephoto end, the first lens group and the most object-side lens group in the rear group are stationary, and each of the plurality of intermediate lens groups moves toward the image side, changing the distance between adjacent lens groups among the lens groups included in the front group and the most object-side lens group in the rear group; The rear group includes a first focus lens group that moves respectively during focusing and a second focus lens group arranged on the image side of the first focus lens group; When the focal length of the first focus lens group is fF1, the focal length of the second focus lens group is fF2, the focal length of the front group at the wide-angle end is fFw, and the focal length of the zoom lens at the wide-angle end is fw, 0.2 ≤ fF2 / fF1 ≤ 2.0 -3 ≤ fFw / fw < 0 A zoom lens characterized by satisfying the following conditions.

2. The zoom lens according to claim 1, wherein the aperture stop is arranged on the most object side in the rear group.

3. The zoom lens according to claim 1, wherein the first focus lens group and the second focus lens group move toward the image side respectively during focusing from an infinite object to a closest object.

4. When the focal length of the zoom lens at the telephoto end is ft and the focal length of the front group at the telephoto end is fFt, -6.5 ≤ fFt / ft < 0.0 A zoom lens characterized by satisfying the following conditions, according to claim 1.

5. When the focal length of the lens group adjacent to the first focus lens group on the object side among the rear group is fRa, -2.0 ≤ fF1 / fRa ≤ -0.5 A zoom lens characterized by satisfying the following conditions, according to claim 1.

6. The most image-side final lens group in the rear group is stationary during zooming and focusing, When the focal length of the final lens group is fi, -2.0 ≤ fF1 / fi < 0.0 A zoom lens characterized by satisfying the following conditions, according to claim 1.

7. A fixed lens group that remains stationary during zooming and focusing is disposed between the first focus lens group and the second focus lens group. When the focal length of the second focus lens group is f2 and the focal length of the fixed lens group is fRb, -2.0 ≤ fF2 / fRb ≤ -0.2 The zoom lens according to claim 1, wherein the condition is satisfied.

8. When the imaging magnification of the first focus lens group at the telephoto end is βF1t and the imaging magnification of the second focus lens group at the telephoto end is βF2t, 0.5 ≤ βF1t / βF2t ≤ 3.0 The zoom lens according to claim 1, wherein the condition is satisfied.

9. When the focus sensitivity of the first focus lens group at the telephoto end is besF1t, the focus sensitivity of the second focus lens group at the telephoto end is besF2t, the imaging magnification of the first focus lens group at the telephoto end is βF1t, the combined imaging magnification of one or more lens groups on the image side of the first focus lens group at the telephoto end is βF1Rt, the imaging magnification of the second focus lens group at the telephoto end is βF2t, and the combined imaging magnification of one or more lens groups on the image side of the second focus lens group at the telephoto end is βF2Rt, besF1t = (1 - βF1t ２ ) × βF1Rt ２ besF2t = (1 - βF2t ２ ) × βF2Rt ２ When 1.5 ≤ |besF1t| / |besF2t| ≤ 5.0 The zoom lens according to claim 1, wherein the condition is satisfied.

10. When the length on the optical axis from the aperture stop to the image plane is ST and the length on the optical axis from the most object-side surface of the zoom lens to the image plane is TTL, 0.4 ≤ ST / TTL ≤ 0.7 The zoom lens according to claim 1, wherein the condition is satisfied.

11. When the focal length of the front group at the telephoto end is fRt and the focal length of the rear group at the telephoto end is fRt, -30 ≤ fFt / fRt < 0 The zoom lens according to claim 1, wherein the condition is satisfied.

12. When the movement amount during focusing from an infinite object to a closest object of the first focus lens group at the wide-angle end is mF1w and the movement amount during focusing from an infinite object to a closest object of the second focus lens group at the wide-angle end is mF2w, 0.4 ≤ |mF2w| / |mF1w| ≤ 2.0 The zoom lens according to claim 1, wherein the condition is satisfied.

13. When the amount of movement during focusing of the first focus lens group from an infinite object to a closest object at the telephoto end is mF1t and the amount of movement during focusing of the second focus lens group from an infinite object to a closest object at the telephoto end is mF2t, 0.3 ≤ |mF2t| / |mF1t| ≤ 2.0 The zoom lens according to claim 1, characterized in that the condition is satisfied.

14. The second focus lens group is composed of one negative lens, When the radius of curvature of the object-side surface of the negative lens is R1 and the radius of curvature of the image-side surface of the negative lens is R2, SF2 = (R2 + R1) / (R2 - R1) When, 0.3 ≤ SF2 ≤ 3.0 The zoom lens according to claim 1, characterized in that the condition is satisfied.

15. The second focus lens group is composed of one negative lens, When the refractive index of the negative lens at the d-line is NdF2, 1.6 ≤ NdF2 ≤ 2.0 The zoom lens according to claim 1, characterized in that the condition is satisfied.

16. When the focal length of the zoom lens at the telephoto end is ft and the length on the optical axis from the most object-side surface to the image plane in the zoom lens is TTL, 0.5 ≤ TTL / ft ≤ 1.5 The zoom lens according to claim 1, characterized in that the condition is satisfied.

17. When the back focus of the zoom lens is BF and the focal length of the most image-side final lens group in the zoom lens is fi, 0.2 ≤ BF / fi ≤ 0.6 The zoom lens according to claim 1, characterized in that the condition is satisfied.

18. The lens group closest to the object side among the plurality of intermediate lens groups has a positive lens and a negative lens from the object side, and the zoom lens according to claim 1 is characterized in that.

19. The lens group closest to the image side among the plurality of intermediate lens groups has a positive lens and a negative lens from the object side, and the zoom lens according to claim 1 is characterized in that.

20. A part of the rear group moves with respect to the optical axis as an anti-vibration group, and the zoom lens according to claim 1 is characterized in that.

21. As the plurality of intermediate lens groups, it has a second lens group with a negative refractive power, a third lens group with a negative refractive power, and a fourth lens group with a positive refractive power, which are arranged in order from the object side to the image side, As the plurality of lens groups constituting the rear group, a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power as the first focus lens group, a seventh lens group having a positive refractive power, and a negative refractive power as the second focus lens group are arranged in order from the object side to the image side. The zoom lens according to claim 1, characterized by having an eighth lens group and a ninth lens group having a positive refractive power.

22. As the plurality of intermediate lens groups, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a fourth lens group having a negative refractive power are arranged in order from the object side to the image side, and As the plurality of lens groups constituting the rear group, a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power as the first focus lens group, a seventh lens group having a positive refractive power, and a negative refractive power as the second focus lens group are arranged in order from the object side to the image side. The zoom lens according to claim 1, characterized by having an eighth lens group and a ninth lens group having a positive refractive power.

23. As the plurality of intermediate lens groups, a second lens group having a negative refractive power and a third lens group having a positive refractive power are arranged in order from the object side to the image side, and As the plurality of lens groups constituting the rear group, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power as the first focus lens group, a sixth lens group having a positive refractive power, and a negative refractive power as the second focus lens group are arranged in order from the object side to the image side. The zoom lens according to claim 1, characterized by having a seventh lens group and an eighth lens group having a positive refractive power.

24. A zoom lens according to any one of claims 1 to 23, and An imaging device, characterized by having an imaging element that images a subject through the zoom lens.

Images