Variable magnification optical system and imaging device

Abstract

A zoom optical system which is compact and maintains good optical performance over the entire zoom range, and an image pickup apparatus including the zoom optical system. The zoom optical system includes, in order from the object side toward the image side, a first lens group having positive refractive power, a front group composed of two or less lens groups having negative refractive power, an intermediate group including a plurality of lens groups, and a final lens group. The most object side lens group of the intermediate group is a first intermediate lens group having positive refractive power. The intermediate group includes an aperture stop. In a case where a focal length of the front group in a state where focusing at a wide angle end is performed on an object at infinity is set as fF, and a focal length of the first lens group is set as f1, the zoom optical system satisfies a conditional expression represented by 0.04 < (-fF) / f1 < 0.4.

Description

Technical Field

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

[0002] Previously, as an optical system applicable to imaging devices such as digital cameras and television cameras, a zoom lens as described in Patent Document 1 has been proposed.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-078770

[0004] There is a demand for a zoom optical system that is compact in size and maintains good optical performance throughout the zoom range. These requirements are increasing year by year. Summary of the Invention

[0005] The present invention provides a zoom optical system that is compact and maintains good optical performance throughout the zoom range, and a camera device having the zoom optical system.

[0006] One aspect of the present invention is a zoom optical system, which consists of, from the object side to the image side, a first lens group with positive refractive power, a front group consisting of two or fewer lens groups with negative refractive power, an intermediate group including multiple lens groups, and a final lens group. The lens group closest to the object side of the intermediate group is the first intermediate lens group with positive refractive power. The intermediate group includes an aperture stop. During zooming, all the intervals between adjacent lens groups change, satisfying the following conditional expression (1):

[0007] 0.04<(-fF) / f1<0.4 (1).

[0008] Here, the focal length of the front group is set to fF when focusing on an object at infinity at the wide-angle end, and the focal length of the first lens group is set to f1.

[0009] When the focal length of the first intermediate lens group is set to fM1, the zoom optical system described above preferably satisfies the following condition (2):

[0010] 0.1 < fM1 / f1 < 0.8 (2).

[0011] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (3):

[0012] 0.05 < fw / f1 < 0.5 (3).

[0013] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (4):

[0014] 0.4<fw / (-fF)<2 (4).

[0015] In a structure in which the intermediate group includes at least one lens group with negative refractive power, when the focal length of the zoom optical system is set to fw in the state of focusing on an object at infinity at the wide-angle end, and the focal length of the lens group with negative refractive power in the intermediate group is set to fMn, the zoom optical system in the above manner preferably satisfies the following condition (5):

[0016] 0.05<fw / (-fMn)<1.5 (5).

[0017] The zoom optical system described above preferably includes 13 or more and 17 or fewer lenses.

[0018] When the refractive index of the positive lens of the first lens group relative to the d line is set to Nd1p, it is preferable that all the positive lenses of the first lens group satisfy the following condition (6):

[0019] 1.4 < Nd1p < 1.62 (6).

[0020] In a structure in which the intermediate group includes at least one lens group with negative refractive power, if the focal length of the lens group with negative refractive power in the intermediate group is set to fMn, the zoom optical system described above preferably satisfies the following condition (7):

[0021] 0.1<(-fF) / (-fMn)<2 (7).

[0022] When the focal length of the zoom optical system is set to ft when focusing on an object at infinity at the telephoto end, and the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, the zoom optical system described above preferably satisfies the following condition (8):

[0023] 2 < ft / fw < 20 (8).

[0024] When the focal length of the first intermediate lens group is set to fM1, the zoom optical system described above preferably satisfies the following condition (9):

[0025] 0.05<(-fF) / fM1<2 (9).

[0026] When the focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end, and the focal length of the final lens group is set to fE, the zoom optical system described above preferably satisfies the following condition (10):

[0027] -1.5<fw / fE<1.5 (10).

[0028] It can be configured such that at least one lens group included in the intermediate group and the final lens group move along the optical axis along the same trajectory during zoom from the wide-angle end to the telephoto end, and the lens groups moving along the same trajectory are not arranged adjacently.

[0029] It can be configured such that the two lens groups included in the intermediate group and the final lens group move along the optical axis along the same trajectory when zooming from the wide-angle end to the telephoto end, and the lens groups moving along the same trajectory are not arranged adjacently.

[0030] It can be configured such that a second intermediate lens group with positive refractive power is arranged adjacent to the image side of the first intermediate lens group within the intermediate group. In this structure, when the focal length of the first intermediate lens group is set to fM1 and the focal length of the second intermediate lens group is set to fM2p, the zoom optical system of the above-described manner preferably satisfies the following conditional expression (11):

[0031] 0.1<fM1 / fM2p<4 (11).

[0032] A third intermediate lens group with positive refractive power can be configured such that a third intermediate lens group with positive refractive power is disposed adjacent to the image side of the second intermediate lens group with positive refractive power within the intermediate group. In this configuration, when the focal length of the second intermediate lens group is set to fM2p and the focal length of the third intermediate lens group is set to fM3p, the zoom optical system of the above configuration preferably satisfies the following conditional expression (12):

[0033] 1<fM2p / fM3p<15 (12).

[0034] A third intermediate lens group with negative refractive power can be configured to be arranged adjacent to the image side of the second intermediate lens group with positive refractive power within the intermediate group. In this structure, when the focal length of the second intermediate lens group is set to fM2p and the focal length of the third intermediate lens group is set to fM3n, the zoom optical system of the above-described manner preferably satisfies the following conditional expression (13):

[0035] 0.1<fM2p / (-fM3n)<1 (13).

[0036] It can be configured such that a second intermediate lens group with negative refractive power is arranged adjacent to the image side of the first intermediate lens group within the intermediate group. In this structure, when the focal length of the first intermediate lens group is set to fM1 and the focal length of the second intermediate lens group is set to fM2n, the zoom optical system of the above manner preferably satisfies the following conditional expression (14):

[0037] 0.1<fM1 / (-fM2n)<2 (14).

[0038] A third intermediate lens group with positive refractive power can be configured to be arranged adjacent to the image side of the second intermediate lens group with negative refractive power within the intermediate group. In this structure, when the focal length of the second intermediate lens group is set to fM2n and the focal length of the third intermediate lens group is set to fM3p, the zoom optical system of the above-described manner preferably satisfies the following conditional expression (15):

[0039] 1<(-fM2n) / fM3p<15 (15).

[0040] It can be configured such that a third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group with negative refractive power within the intermediate group. In this structure, when the focal length of the second intermediate lens group is set to fM2n and the focal length of the third intermediate lens group is set to fM3n, it is preferable to satisfy the following conditional expression (16):

[0041] 0.3<(-fM2n) / (-fM3n)<3 (16).

[0042] Another aspect of the present invention is a camera device having a zoom optical system as described above.

[0043] In addition, the phrases “composed of” and “constituted by” in this specification indicate that, in addition to the constituent elements listed, it may also include lenses that do not substantially have refractive power, as well as optical elements other than lenses such as apertures, filters and cover glass, and mechanism parts such as lens flanges, lens barrels, camera elements and hand shaking correction mechanisms.

[0044] In this specification, "a group with positive refractive power" means that the entire group has positive refractive power. Similarly, "a group with negative refractive power" means that the entire group has negative refractive power. "A lens with positive refractive power" has the same meaning as "positive lens." "A lens with negative refractive power" has the same meaning as "negative lens." In this specification, "a group" is not limited to a structure consisting of multiple lenses; it can also be a structure consisting of only one lens.

[0045] In this specification, the number of lens elements refers to the number of individual lenses that form the constituent elements. For example, the number of lenses in a combined lens, which is formed by joining multiple individual lenses of different materials, is expressed as the number of individual lenses constituting the combined lens. However, a compound aspherical lens (a lens (e.g., a spherical lens) and an aspherical film formed on the lens are integrated and function as a single aspherical lens) is used as a single lens and not considered a combined lens. Unless otherwise specified, the symbols and surface shapes of the refractive power associated with lenses including aspherical surfaces use the symbols and surface shapes of the refractive power of the paraxial region.

[0046] The "focal length" used in the conditional expression is the paraxial focal length. Unless otherwise specified, the values ​​used in the conditional expression are those taken with the d-line as a reference when focusing on an object at infinity.

[0047] Invention Effects

[0048] According to the present invention, a zoom optical system configured to be small and maintaining good optical performance throughout the zoom range, and a camera device having the zoom optical system, can be provided. Attached Figure Description

[0049] Figure 1 This is a cross-sectional view and a diagram showing the structure and movement trajectory of a zoom optical system corresponding to the zoom optical system of Embodiment 1 and an embodiment thereof.

[0050] Figure 2 yes Figure 1 A cross-sectional view of the structure at the wide-angle end of the zoom optical system.

[0051] Figure 3 These are aberration diagrams of the zoom optical system in Example 1.

[0052] Figure 4 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 2.

[0053] Figure 5 These are aberration diagrams of the zoom optical system in Example 2.

[0054] Figure 6 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 3.

[0055] Figure 7 These are aberration diagrams of the zoom optical system in Example 3.

[0056] Figure 8 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 4.

[0057] Figure 9 These are aberration diagrams of the zoom optical system in Example 4.

[0058] Figure 10 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 5.

[0059] Figure 11 These are aberration diagrams of the zoom optical system in Example 5.

[0060] Figure 12 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 6.

[0061] Figure 13 These are aberration diagrams of the zoom optical system in Example 6.

[0062] Figure 14 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 7.

[0063] Figure 15 These are aberration diagrams of the zoom optical system in Example 7.

[0064] Figure 16 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 8.

[0065] Figure 17 These are aberration diagrams of the zoom optical system in Example 8.

[0066] Figure 18 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 9.

[0067] Figure 19 These are aberration diagrams of the zoom optical system in Example 9.

[0068] Figure 20 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 10.

[0069] Figure 21 These are aberration diagrams of the zoom optical system in Example 10.

[0070] Figure 22 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 11.

[0071] Figure 23 These are aberration diagrams of the zoom optical system in Example 11.

[0072] Figure 24 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 12.

[0073] Figure 25 These are aberration diagrams of the zoom optical system in Example 12.

[0074] Figure 26 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 13.

[0075] Figure 27 These are aberration diagrams of the zoom optical system in Example 13.

[0076] Figure 28 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 14.

[0077] Figure 29 These are aberration diagrams of the zoom optical system in Example 14.

[0078] Figure 30 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 15.

[0079] Figure 31 These are aberration diagrams of the zoom optical system in Example 15.

[0080] Figure 32 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 16.

[0081] Figure 33 These are aberration diagrams of the zoom optical system in Example 16.

[0082] Figure 34 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 17.

[0083] Figure 35 These are aberration diagrams of the zoom optical system in Example 17.

[0084] Figure 36 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 18.

[0085] Figure 37 These are aberration diagrams of the zoom optical system in Example 18.

[0086] Figure 38 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 19.

[0087] Figure 39 These are aberration diagrams of the zoom optical system in Example 19.

[0088] Figure 40 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 20.

[0089] Figure 41 These are aberration diagrams of the zoom optical system in Example 20.

[0090] Figure 42 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 21.

[0091] Figure 43 These are aberration diagrams of the zoom optical system in Example 21.

[0092] Figure 44 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 22.

[0093] Figure 45 These are aberration diagrams of the zoom optical system in Example 22.

[0094] Figure 46 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 23.

[0095] Figure 47 These are aberration diagrams of the zoom optical system in Example 23.

[0096] Figure 48 This is a cross-sectional view and a diagram showing the movement trajectory of the zoom optical system of Embodiment 24.

[0097] Figure 49 These are aberration diagrams of the zoom optical system in Example 24.

[0098] Figure 50 This is a perspective view of the front side of a camera device according to one embodiment.

[0099] Figure 51 This is a perspective view of the rear side of a camera device according to one embodiment.

[0100] Symbol Explanation

[0101] 1- Zoom optical system, 20- Interchangeable lens, 30- Camera, 31- Camera body, 32- Shutter button, 33- Power button, 34- Operation unit, 35- Operation unit, 36- Display unit, 37- Bayonet mount, 38- Image sensor, G1- First lens group, GE- Final lens group, GF- Front group, GF1- First front lens group, GF2- Second front lens group, GM- Intermediate group, GM1- First intermediate lens group, GM2- Second intermediate lens group, GM3- Third intermediate lens group, GM4- Fourth intermediate lens group, L11~L52- Lens, Sim- Image plane, St- Aperture stop, Z- Optical axis, ωt- Maximum half field of view, ωw- Maximum half field of view. Detailed Implementation

[0102] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0103] Figure 1 The diagram illustrates the structure, cross-sectional view, and movement trajectory of a zoom optical system according to an embodiment of the present invention. Figure 1 In the image, the upper section labeled "Wide" shows the wide-angle view, and the lower section labeled "Tele" shows the telephoto view. Figure 1 In the diagram, the on-axis beam at the wide-angle end and the beam with the maximum half-field angle ωw are shown, as well as the on-axis beam at the telephoto end and the beam with the maximum half-field angle ωt. Figure 2 The middle shows Figure 1 A cross-sectional view of the structure of a zoom optical system at the wide-angle end. Figure 1 and Figure 2 The image shows the state of focusing on an object at infinity, with the left side being the object side and the right side being the image side. Figure 1 and Figure 2 The example shown corresponds to the zoom optical system of Embodiment 1 described later. Hereinafter, reference will be made primarily to... Figure 1 Provide explanations and refer to them as needed. Figure 2 .

[0104] The zoom optical system of the present invention, along the optical axis Z from the object side to the image side, consists of a first lens group G1 with positive refractive power, a front group GF composed of two or fewer lens groups with negative refractive power, an intermediate group GM comprising multiple lens groups, and a final lens group GE. The lens group closest to the object side of the intermediate group GM is the first intermediate lens group GM1 with positive refractive power. The intermediate group GM includes an aperture stop St. During zooming, the spacing between all adjacent lens groups changes. This structure facilitates miniaturization and provides good correction of aberrations throughout the zoom range.

[0105] Furthermore, in this specification, a lens group is defined as a group whose optical axis spacing changes during zooming. During zooming, the spacing between adjacent lenses within a single lens group remains unchanged. That is, a "lens group" is a component of the zoom optical system and includes at least one lens separated by an air gap that changes during zooming. Lenses are moved or fixed individually during zooming. A "lens group" may include components other than lenses that do not have refractive power (e.g., aperture stops, St, etc.).

[0106] As an example, such as Figure 2 Its detailed structure is shown. Figure 1The zoom optical system is configured as follows: The first lens group G1 consists of one lens, L11. The front group GF consists of one lens group. The lens group constituting the front group GF consists of four lenses, L21 to L24, arranged sequentially from the object side to the image side. The intermediate group GM consists of two lens groups, the first intermediate lens group GM1 and the second intermediate lens group GM2, arranged sequentially from the object side to the image side. The first intermediate lens group GM1 consists of six lenses, the aperture stop St and lenses L31 to L36, arranged sequentially from the object side to the image side. The second intermediate lens group GM2 consists of one lens, L41. The final lens group GE consists of two lenses, L51 and L52, arranged sequentially from the object side to the image side. Additionally, Figure 1 and Figure 2 The aperture stop St shown does not represent size or shape, but rather the position along the optical axis.

[0107] exist Figure 1 In the example, during zooming, all lens groups change the spacing between themselves and adjacent lens groups, moving along the optical axis Z. Figure 1 In the middle section, between the upper and lower diagrams, solid arrows represent the approximate movement trajectories of each lens group during zooming from the wide-angle end to the telephoto end.

[0108] Furthermore, in Figure 1 In the example, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory along the optical axis Z during zooming from the wide-angle end to the telephoto end. Thus, in the zoom optical system of the present invention, at least one lens group included in the intermediate group GM and the final lens group GE can be configured to move along the same trajectory along the optical axis Z during zooming from the wide-angle end to the telephoto end. By configuring multiple lens groups to move along the same trajectory during zooming, the movement mechanism can be simplified. A more preferred configuration is that two lens groups included in the intermediate group GM and the final lens group GE move along the same trajectory along the optical axis Z during zooming from the wide-angle end to the telephoto end. With this configuration, the movement mechanism is further simplified. Furthermore, it is assumed that the lens groups moving along the aforementioned same trajectory are not arranged adjacently. And, the term "same" includes errors permissible in this technical field.

[0109] The first lens group G1 can be configured as a single lens or a group of combined lenses. This configuration is advantageous for miniaturization.

[0110] The intermediate group GM can be configured to include at least one lens group with negative refractive power. By including at least one lens group with negative refractive power in addition to the first intermediate lens group GM1 with positive refractive power, it is beneficial to correct various aberrations well throughout the zoom range.

[0111] The final lens group GE can be configured as a set of combined lenses or a single lens. This configuration is advantageous for miniaturization.

[0112] In the technology of this invention, at least one focusing group that moves during focusing can be configured within the zoom optical system. For example, at least one focusing group can be configured within the intermediate group GM. By configuring the focusing group within the intermediate group GM, where the light level is relatively low, it is beneficial to miniaturize and lighten the focusing group. More specifically, the lens group closest to the image side of the lens group with negative refractive power within the intermediate group GM can be configured as the focusing group. In this configuration, it is beneficial to suppress breathing effect. The focusing group can be configured to consist of a single lens. In this configuration, it is beneficial to miniaturize and lighten the focusing group.

[0113] exist Figure 1 In this example, the focusing group consists of the second intermediate lens group GM2. (Note: The last part is a label or annotation and doesn't need a direct translation.) Figure 1 In the lower section of the diagram, the brackets and right arrow of the second intermediate lens group GM2 indicate that this lens group is the focusing group, and the direction of the focusing group's movement when focusing from an object at infinity to the nearest object. Furthermore, the focusing group operates throughout the entire zoom range, including the wide-angle end, but... Figure 1 To avoid complicating the diagram, the aforementioned arrows are only shown in the lower section of the diagram. The above-described illustration method related to the focus group is also the same in the diagrams of other embodiments.

[0114] Furthermore, in the technology of this invention, such as Figure 12 As shown in Embodiment 6 described later, the system can be configured to include an anti-vibration group that moves along a direction intersecting the optical axis Z when correcting image jitter. In this case, the anti-vibration group can be configured within the intermediate group GM. By configuring the anti-vibration group within the intermediate group GM, where the light beam height is relatively low, it is beneficial to miniaturize and reduce the weight of the anti-vibration group.

[0115] exist Figure 12 In the example, the vibration damping group consists of the second lens from the object side of the first intermediate lens group GM1. (Note:) Figure 12 The downward arrow in the lower section of the diagram indicates that the lens is a vibration damping unit. Furthermore, the vibration damping unit functions throughout the entire zoom range, including the wide-angle end, but... Figure 12 To avoid complicating the diagram, the aforementioned arrows are only shown in the lower section of the diagram. The above-described illustration method related to the vibration damping group is also the same in the diagrams of other embodiments.

[0116] In the technology of this invention, the zoom optical system can be configured to include 13 or more but less than 17 lenses. This configuration is advantageous for balancing the correction of various aberrations and miniaturization.

[0117] Next, preferred and feasible structures related to the conditional expressions of the zoom optical system of the present invention will be described. Furthermore, in the descriptions related to the following conditional expressions, to avoid lengthy explanations, the same notations will be used for the same definitions, and repeated explanations of some notations will be omitted. Also, to avoid lengthy explanations, "the zoom optical system of the present invention" will be simply referred to as "zoom optical system" below.

[0118] The zoom optical system preferably satisfies the following condition (1). Here, the focal length of the front group GF is set to fF when focusing on an object at infinity at the wide-angle end. The focal length of the first lens group G1 is set to f1. By ensuring that the corresponding value of condition (1) is not below the lower limit, the refractive power of the first lens group G1 can be enhanced, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (1) is not above the upper limit, it is beneficial to maintain the zoom effect of the front group GF and reduce the amount of movement of the front group GF during zooming, thus also facilitating miniaturization.

[0119] 0.04<(-fF) / f1<0.4 (1)

[0120] To obtain better properties, the lower limit of conditional expression (1) is more preferably set to 0.08, further preferably 0.1, further preferably 0.12, further preferably 0.125, further preferably 0.13, further preferably 0.135, further preferably 0.14, and further preferably 0.143. To obtain better properties, the upper limit of conditional expression (1) is more preferably set to 0.35, further preferably 0.3, further preferably 0.28, further preferably 0.26, further preferably 0.24, further preferably 0.22, further preferably 0.2, and further preferably 0.19.

[0121] The zoom optical system preferably satisfies the following condition (2). Here, the focal length of the first intermediate lens group GM1 is set to fM1. By ensuring that the corresponding value of condition (2) is not below the lower limit, the refractive power of the first lens group G1 will not become too weak, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (2) is not above the upper limit, the refractive power of the first lens group G1 will not become too strong, thus facilitating the suppression of aberration variations during zooming.

[0122] 0.1 < fM1 / f1 < 0.8 (2)

[0123] To obtain better properties, the lower limit of condition (2) is more preferably set to 0.12, more preferably 0.14, more preferably 0.17, more preferably 0.2, more preferably 0.22, more preferably 0.24, more preferably 0.26, and more preferably 0.28. To obtain better properties, the upper limit of condition (2) is more preferably set to 0.6, more preferably 0.5, more preferably 0.45, more preferably 0.4, more preferably 0.39, more preferably 0.38, more preferably 0.37, and more preferably 0.36.

[0124] The zoom optical system preferably satisfies the following condition (3). Here, the focal length of the zoom optical system in the state of focusing on an object at infinity at the wide-angle end is set to fw. By ensuring that the corresponding value of condition (3) is not below the lower limit, the refractive power of the first lens group G1 will not become too weak, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (3) is not above the upper limit, it is beneficial to ensure the field of view at the wide-angle end.

[0125] 0.05 < fw / f1 < 0.5 (3)

[0126] To obtain better properties, the lower limit of condition (3) is more preferably set to 0.08, more preferably 0.1, more preferably 0.11, more preferably 0.115, more preferably 0.118, more preferably 0.12, more preferably 0.122, and more preferably 0.124. To obtain better properties, the upper limit of condition (3) is more preferably set to 0.4, more preferably 0.35, more preferably 0.3, more preferably 0.26, more preferably 0.24, more preferably 0.22, more preferably 0.21, and more preferably 0.205.

[0127] The zoom optical system preferably satisfies the following condition (4). By ensuring that the corresponding value of condition (4) is not below the lower limit, it is beneficial to achieve a high zoom ratio. By ensuring that the corresponding value of condition (4) is not above the upper limit, it is beneficial to suppress image plane curvature.

[0128] 0.4<fw / (-fF)<2 (4)

[0129] To obtain better properties, the lower limit of condition (4) is more preferably set to 0.6, more preferably 0.7, more preferably 0.75, more preferably 0.8, more preferably 0.85, more preferably 0.875, more preferably 0.9, and more preferably 0.92. To obtain better properties, the upper limit of condition (4) is more preferably set to 1.8, more preferably 1.6, more preferably 1.4, more preferably 1.3, more preferably 1.25, more preferably 1.2, more preferably 1.16, and more preferably 1.13.

[0130] The zoom optical system preferably satisfies the following condition (9). By ensuring that the corresponding value of condition (9) is not below the lower limit, the negative refractive power of the anterior group GF will not become too strong, thus helping to suppress the variation of spherical aberration during zooming. By ensuring that the corresponding value of condition (9) is not above the upper limit, it helps to suppress the variation of distortion aberration during zooming.

[0131] 0.05<(-fF) / fM1<2 (9)

[0132] To obtain better properties, the lower limit of condition (9) is more preferably set to 0.1, more preferably 0.15, more preferably 0.2, more preferably 0.25, more preferably 0.3, more preferably 0.33, more preferably 0.35, and more preferably 0.37. To obtain better properties, the upper limit of condition (9) is more preferably set to 1.6, more preferably 1.2, more preferably 1, more preferably 0.9, more preferably 0.8, more preferably 0.7, more preferably 0.6, and more preferably 0.5.

[0133] The zoom optical system preferably satisfies the following condition (10). Here, the focal length of the final lens group GE is set to fE. By ensuring that the corresponding value of condition (10) is not below the lower limit within the negative range, the total optical length at the wide-angle end can be easily shortened, thus facilitating miniaturization. By ensuring that the corresponding value of condition (10) is not above the upper limit within the positive range, it is beneficial to suppress spherical aberration at the wide-angle end.

[0134] -1.5 < fw / fE < 1.5 (10)

[0135] To obtain better properties, the lower limit of condition (10) is more preferably set to -1, more preferably -0.8, more preferably -0.6, more preferably -0.4, more preferably -0.3, more preferably -0.2, more preferably -0.13, and more preferably -0.09. To obtain better properties, the upper limit of condition (10) is more preferably set to 1, more preferably 0.8, more preferably 0.6, more preferably 0.4, more preferably 0.3, more preferably 0.2, more preferably 0.13, and more preferably 0.09.

[0136] In a structure where the intermediate group GM includes at least one lens group with negative refractive power, the zoom optical system preferably satisfies the following condition (5). Here, the focal length of the lens group with negative refractive power in the intermediate group GM, which is closest to the image, is set to fMn. By ensuring that the corresponding value of condition (5) is not below the lower limit, the refractive power of the lens group with negative refractive power in the intermediate group GM, which is closest to the image, will not become too weak, thus suppressing the amount of movement during zooming. As a result, the total optical length will not become too long, which is beneficial for miniaturization. By ensuring that the corresponding value of condition (5) is not above the upper limit, the refractive power of the lens group with negative refractive power in the intermediate group GM, which is closest to the image, will not become too strong, which is particularly beneficial for suppressing the diameter of the on-axis beam at the telephoto end from becoming too large.

[0137] 0.05<fw / (-fMn)<1.5 (5)

[0138] To obtain better properties, the lower limit of condition (5) is more preferably set to 0.12, more preferably 0.15, more preferably 0.18, more preferably 0.2, more preferably 0.22, more preferably 0.24, more preferably 0.27, and more preferably 0.3. To obtain better properties, the upper limit of condition (5) is more preferably set to 0.9, more preferably 0.5, more preferably 0.49, more preferably 0.48, more preferably 0.47, more preferably 0.46, more preferably 0.45, and more preferably 0.44.

[0139] In a structure where the intermediate group GM includes at least one lens group with negative refractive power, the zoom optical system preferably satisfies the following condition (7). By ensuring that the corresponding value of condition (7) is not below the lower limit, the refractive power of the lens group closest to the image side in the lens group with negative refractive power within the intermediate group GM will not become too weak, thus suppressing the amount of movement during zooming. As a result, the total optical length will not become too long, which is beneficial for miniaturization. By ensuring that the corresponding value of condition (7) is not above the upper limit, it is beneficial to maintain the zoom effect of the front group GF and to reduce the amount of movement of the front group GF during zooming, which is also beneficial for miniaturization.

[0140] 0.1<(-fF) / (-fMn)<2 (7)

[0141] To obtain better properties, the lower limit of condition (7) is more preferably set to 0.15, further preferably 0.2, further preferably 0.24, further preferably 0.27, further preferably 0.3, further preferably 0.31, further preferably 0.32, and further preferably 0.33. To obtain better properties, the upper limit of condition (7) is more preferably set to 1.5, further preferably 1, further preferably 0.8, further preferably 0.6, further preferably 0.55, further preferably 0.5, further preferably 0.48, and further preferably 0.45.

[0142] In a structure in which the intermediate group GM includes at least one lens group with negative refractive power, the zoom optical system preferably satisfies the following condition (18). By ensuring that the corresponding value of condition (18) is not below the lower limit, the refractive power of the first lens group G1 will not become too weak, thus facilitating a shorter overall optical length. By ensuring that the corresponding value of condition (18) is not above the upper limit, the refractive power of the first lens group G1 will not become too strong, thus easily preventing overcorrection of spherical aberration at the telephoto end.

[0143] 0.1<(-fMn) / f1<1.5 (18)

[0144] To obtain better properties, the lower limit of condition (18) is more preferably set to 0.14, more preferably 0.17, more preferably 0.2, more preferably 0.22, more preferably 0.24, more preferably 0.26, more preferably 0.28, and more preferably 0.3. To obtain better properties, the upper limit of condition (18) is more preferably set to 1, more preferably 0.8, more preferably 0.75, more preferably 0.7, more preferably 0.65, more preferably 0.6, more preferably 0.55, and more preferably 0.5.

[0145] The intermediate group GM preferably includes at least one lens that satisfies the following conditions (24) and (25). Here, the refractive index of the lens included in the intermediate group GM relative to the d-line is set as NdM. The Abbe number of the lens included in the intermediate group GM based on the d-line is set as νdM.

[0146] 1.8<NdM+0.01×νdM<2.14 (24)

[0147] 49<νdM<59 (25)

[0148] By ensuring that the corresponding value of condition (24) is not below the lower limit, materials other than those with low refractive index and low Abbe number can be selected, thus making it easy to correct magnification color difference. By ensuring that the corresponding value of condition (24) is not above the upper limit, materials other than those with high refractive index and high Abbe number can be selected, thus making it easy to select materials with low specific gravity and thus making it easy to reduce weight.

[0149] To obtain better properties, the lower limit of condition (24) is more preferably set to 1.85, more preferably 1.9, and even more preferably 1.95. To obtain better properties, the upper limit of condition (24) is more preferably set to 2.13, more preferably 2.12, and even more preferably 2.11.

[0150] By ensuring that the corresponding value of condition (25) is not below the lower limit, it is beneficial to suppress chromatic aberration. By ensuring that the corresponding value of condition (25) is not above the upper limit, readily available materials can be used, which is beneficial to achieving a zoom optical system that suppresses spherical aberration and astigmatism.

[0151] To obtain better properties, the lower limit of condition (25) is more preferably set to 50, more preferably 51, and more preferably 52. ​​To obtain better properties, the upper limit of condition (25) is more preferably set to 58, more preferably 57, and more preferably 56.5.

[0152] When the refractive index of the positive lens of the first lens group G1 relative to the d-line is set to Nd1p, it is preferable that all positive lenses of the first lens group G1 satisfy the following condition (6). By ensuring that the corresponding value of condition (6) is not below the lower limit, it is particularly beneficial to correct spherical aberration at the telescope end. By ensuring that the corresponding value of condition (6) is not above the upper limit, it is easy to suppress the weight of the first lens group G1.

[0153] 1.4 < Nd1p < 1.62 (6)

[0154] To obtain better properties, the lower limit of condition (6) is more preferably set to 1.41, further preferably 1.42, further preferably 1.43, further preferably 1.44, further preferably 1.45, further preferably 1.46, further preferably 1.47, and further preferably 1.48. To obtain better properties, the upper limit of condition (6) is more preferably set to 1.59, further preferably 1.585, further preferably 1.58, further preferably 1.575, further preferably 1.57, further preferably 1.565, further preferably 1.56, and further preferably 1.555.

[0155] The zoom optical system preferably includes at least one specific lens as described below. A specific lens is defined as a lens that satisfies the following conditions (19) and (20). Here, the refractive index of the lens included in the zoom optical system relative to the d-line is set as Nd. The Abbe number of the d-line reference of the lens included in the zoom optical system is set as νd. As an example, in Figure 2 In the example, lens L21 and lens L41 are specific lenses.

[0156] 2.435<Nd+0.01425×νd<2.75 (19)

[0157] 15<νd<39 (20)

[0158] The material of a particular lens can be, for example, glass. The proceedings of the 49th Optical Symposium (June 20-21, 2024, hosted by the Japan Optical Society) on pp. 40-42 describe optical glass and its manufacturing method that satisfy conditions (19) and (20).

[0159] By ensuring that the corresponding value of condition (19) is not below the lower limit, it is beneficial to perform good correction of spherical aberration and chromatic aberration. By ensuring that the corresponding value of condition (19) is not above the upper limit, it is possible to suppress the difficulty of correcting image plane curvature.

[0160] To obtain better properties, the lower limit of condition (19) is more preferably set to 2.445, and even more preferably 2.45. To obtain better properties, the upper limit of condition (19) is more preferably set to 2.74, and even more preferably 2.73.

[0161] By ensuring that the corresponding value of conditional expression (20) is not below the lower limit, in addition to correcting the primary achromatic difference, the secondary spectrum can also be well corrected when correcting color difference. By ensuring that the corresponding value of conditional expression (20) is not above the upper limit, the secondary spectrum can be corrected more reliably and well.

[0162] To obtain better properties, the lower limit of condition (20) is more preferably set to 15.5, further preferably 16, further preferably 16.5, further preferably 16.8, further preferably 17.1, and further preferably 17.3. To obtain better properties, the upper limit of condition (20) is more preferably set to 36, further preferably 34, further preferably 33.5, further preferably 33, further preferably 32.5, and further preferably 32.

[0163] In a zoom optical system, where at least one focusing group that moves during focusing is configured within the zoom optical system and the focusing group is composed of a single lens, the zoom optical system preferably satisfies the following condition (21). Here, the Abbe number of the d-line reference of the lens constituting the focusing group is set to νdfoc. By ensuring that the corresponding value of condition (21) is not below the lower limit, it is beneficial to suppress variations in chromatic aberration during focusing. By ensuring that the corresponding value of condition (21) is not above the upper limit, readily available materials can be used, thus facilitating the realization of a zoom optical system that suppresses spherical aberration and astigmatism.

[0164] 30<νdfoc<90 (21)

[0165] To obtain better properties, the lower limit of condition (21) is more preferably set to 34, further preferably 38, further preferably 42, further preferably 46, further preferably 50, and further preferably 53. To obtain better properties, the upper limit of condition (21) is more preferably set to 80, further preferably 70, further preferably 65, further preferably 63, further preferably 62, and further preferably 61.

[0166] In a structure in which at least one focus group that moves during focusing is located within the intermediate group GM, the zoom optical system preferably satisfies the following condition (23). Here, the focal length of the focus group with the strongest refractive power among the focus groups within the intermediate group GM is set to ffocmax. By ensuring that the corresponding value of condition (23) is not below the lower limit, it is beneficial to suppress aberration variations during focusing. By ensuring that the corresponding value of condition (23) is not above the upper limit, the refractive power of the focus group can be ensured, thus making it easier to suppress the amount of movement of the focus group during focusing, which is beneficial for miniaturization.

[0167] 1.2<|ffocmax / fw|<5 (23)

[0168] To obtain better properties, the lower limit of condition (23) is more preferably set to 1.3, more preferably 1.4, more preferably 1.5, more preferably 1.6, more preferably 1.7, more preferably 1.8, more preferably 1.9, and more preferably 2. To obtain better properties, the upper limit of condition (23) is more preferably set to 4.5, more preferably 4, more preferably 3.7, more preferably 3.4, more preferably 3.3, more preferably 3.2, more preferably 3.1, and more preferably 3.

[0169] In a structure where the anti-shake group moves along the direction intersecting the optical axis Z during image jitter correction, the zoom optical system preferably satisfies the following condition (17). Here, the focal length of the anti-shake group is set to fIS. By ensuring that the corresponding value of condition (17) is not below the lower limit, it is beneficial to suppress aberration changes during image jitter correction. By ensuring that the corresponding value of condition (17) is not above the upper limit, the refractive power of the anti-shake group can be ensured, thus easily suppressing the amount of movement of the anti-shake group during image jitter correction, which is beneficial for miniaturization.

[0170] 0.4 < |fIS / ft| < 5 (17)

[0171] To obtain better properties, the lower limit of condition (17) is more preferably set to 0.5, more preferably 0.6, more preferably 0.7, more preferably 0.8, more preferably 0.85, more preferably 0.9, more preferably 0.95, and more preferably 1. To obtain better properties, the upper limit of condition (17) is more preferably set to 4, more preferably 3, more preferably 2, more preferably 1.7, more preferably 1.5, more preferably 1.4, more preferably 1.3, and more preferably 1.25.

[0172] The zoom optical system preferably satisfies the following condition (8). Here, the focal length of the zoom optical system in the state of focusing on an object at infinity at the telephoto end is set to ft. By ensuring that the corresponding value of condition (8) is not below the lower limit, a high zoom ratio can be ensured as a zoom optical system. By ensuring that the corresponding value of condition (8) is not above the upper limit, it is easy to correct various aberrations throughout the zoom range.

[0173] 2 < ft / fw < 20 (8)

[0174] To obtain better properties, the lower limit of condition (8) is more preferably set to 2.1, more preferably 2.2, more preferably 2.3, more preferably 2.4, more preferably 2.5, more preferably 2.55, more preferably 2.6, and more preferably 2.65. To obtain better properties, the upper limit of condition (8) is more preferably set to 15, more preferably 10, more preferably 8, more preferably 7, more preferably 6, more preferably 5, more preferably 4, and more preferably 3.5.

[0175] The zoom optical system preferably satisfies the following condition (22). Here, the maximum half field of view in the state of focusing on an object at infinity at the wide-angle end is set as ωw. The unit of ωw is set as degrees. By ensuring that the corresponding value of condition (22) is not below the lower limit, it is beneficial for wide-angle viewing. By ensuring that the corresponding value of condition (22) is not above the upper limit, it is beneficial for miniaturization.

[0176] 35<ωw<55 (22)

[0177] To obtain better properties, the lower limit of condition (22) is more preferably set to 40, more preferably 42, and more preferably 43. To obtain better properties, the upper limit of condition (22) is more preferably set to 50, more preferably 48, and more preferably 47.

[0178] in addition, Figure 1 The example shown is one illustration; the zoom optical system of the present invention can be modified in various ways without departing from the spirit of the invention. For example, the number of lens groups included in the front group GF, the number of lens groups included in the middle group GM, the number of lenses included in each lens group, the number of lenses included in the focusing group, and the number of lenses included in the anti-vibration group can be set to be the same as the number of lenses included in the anti-vibration group. Figure 1 The number of examples varies. And, Figure 1 The example shown is a zoom lens, but the zoom optical system of the present invention can also be a variable focal length lens.

[0179] The following is a structural example related to the intermediate group GM. A second intermediate lens group with positive refractive power can be configured to be arranged adjacent to the image side of the first intermediate lens group GM1 within the intermediate group GM. In this configuration, the zoom optical system preferably satisfies the following conditional expression (11). Here, the focal length of the second intermediate lens group with positive refractive power is set to fM2p. By ensuring that the corresponding value of conditional expression (11) is not below the lower limit, the positive refractive power of the second intermediate lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end. By ensuring that the corresponding value of conditional expression (11) is not above the upper limit, the refractive power of the second intermediate lens group will not become too strong, thus facilitating the suppression of aberration variations during zooming.

[0180] 0.1 < fM1 / fM2p < 4 (11)

[0181] To obtain better properties, the lower limit of condition (11) is more preferably set to 0.4, more preferably 0.7, more preferably 1, more preferably 1.3, more preferably 1.6, and more preferably 1.9. To obtain better properties, the upper limit of condition (11) is more preferably set to 3, more preferably 2.9, more preferably 2.8, more preferably 2.7, more preferably 2.6, and more preferably 2.5.

[0182] A second intermediate lens group with positive refractive power can be configured to be arranged adjacent to the image side of the first intermediate lens group GM1 within the intermediate group GM, and a third intermediate lens group with positive refractive power can be arranged adjacent to the image side of the second intermediate lens group. In this structure, the zoom optical system preferably satisfies the following condition (12). Here, the focal length of the second intermediate lens group with positive refractive power is set to fM2p. The focal length of the third intermediate lens group with positive refractive power is set to fM3p. By ensuring that the corresponding value of condition (12) is not below the lower limit, the positive refractive power of the third intermediate lens group will not become too weak, thus making it easier to reduce the incident angle of the off-axis principal ray towards the image plane Sim. By ensuring that the corresponding value of condition (12) is not above the upper limit, the positive refractive power of the second intermediate lens group will not become too weak, thus facilitating the correction of spherical aberration at the telephoto end.

[0183] 1 < fM2p / fM3p < 15 (12)

[0184] To obtain better properties, the lower limit of condition (12) is more preferably set to 3, further preferably 4, further preferably 5, further preferably 5.5, further preferably 6, and further preferably 6.5. To obtain better properties, the upper limit of condition (12) is more preferably set to 13, further preferably 11.5, further preferably 10.5, further preferably 9.5, further preferably 8.5, and further preferably 7.5.

[0185] Alternatively, within the intermediate group GM, a second intermediate lens group with positive refractive power is disposed adjacent to the image side of the first intermediate lens group GM1, and a third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group. In this structure, the zoom optical system preferably satisfies the following conditional expression (13). Here, the focal length of the second intermediate lens group with positive refractive power is set to fM2p. The focal length of the third intermediate lens group with negative refractive power is set to fM3n. By ensuring that the corresponding value of conditional expression (13) is not below the lower limit, the refractive power of the second intermediate lens group will not become too strong, thus helping to suppress aberration variations during zooming. By ensuring that the corresponding value of conditional expression (13) is not above the upper limit, the positive refractive power of the second intermediate lens group will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0186] 0.1<fM2p / (-fM3n)<1 (13)

[0187] To obtain better properties, the lower limit of condition (13) is more preferably set to 0.15, further preferably 0.2, further preferably 0.25, further preferably 0.3, further preferably 0.35, and further preferably 0.38. To obtain better properties, the upper limit of condition (13) is more preferably set to 0.9, further preferably 0.8, further preferably 0.7, further preferably 0.6, further preferably 0.55, and further preferably 0.52.

[0188] Alternatively, a second intermediate lens group with negative refractive power may be configured adjacent to the image side of the first intermediate lens group GM1 within the intermediate group GM. In this configuration, the zoom optical system preferably satisfies the following conditional expression (14). Here, the focal length of the second intermediate lens group with negative refractive power is set to fM2n. By ensuring that the corresponding value of conditional expression (14) is not below the lower limit, the refractive power of the first intermediate lens group GM1 will not become too strong, thus helping to suppress aberration variations during zooming. By ensuring that the corresponding value of conditional expression (14) is not above the upper limit, the refractive power of the first intermediate lens group GM1 will not become too weak, thus helping to suppress spherical aberration at the telephoto end.

[0189] 0.1<fM1 / (-fM2n)<2 (14)

[0190] To obtain better properties, the lower limit of condition (14) is more preferably set to 0.12, more preferably 0.14, more preferably 0.16, more preferably 0.18, more preferably 0.2, and more preferably 0.21. To obtain better properties, the upper limit of condition (14) is more preferably set to 1.5, more preferably 1.2, more preferably 1, more preferably 0.8, more preferably 0.7, and more preferably 0.6.

[0191] Alternatively, a second intermediate lens group with negative refractive power can be configured adjacent to the image side of the first intermediate lens group GM1 within the intermediate group GM, and a third intermediate lens group with positive refractive power can be configured adjacent to the image side of the second intermediate lens group. In this configuration, the zoom optical system preferably satisfies the following conditional expression (15). Here, the focal length of the second intermediate lens group with negative refractive power is set to fM2n. The focal length of the third intermediate lens group with positive refractive power is set to fM3p. By ensuring that the corresponding value of conditional expression (15) is not below the lower limit, the positive refractive power of the third intermediate lens group will not become too weak, thus making it easier to reduce the incident angle of the off-axis principal ray towards the image plane Sim. By ensuring that the corresponding value of conditional expression (15) is not above the upper limit, the refractive power of the third intermediate lens group will not become too strong, thus helping to suppress aberration variations during zooming.

[0192] 1<(-fM2n) / fM3p<15 (15)

[0193] To obtain better properties, the lower limit of condition (15) is more preferably set to 2, more preferably 3, more preferably 3.5, more preferably 4, more preferably 4.5, and more preferably 5. To obtain better properties, the upper limit of condition (15) is more preferably set to 13, more preferably 12, more preferably 11, more preferably 10, more preferably 9, and more preferably 8.

[0194] Alternatively, within the intermediate group GM, a second intermediate lens group with negative refractive power is arranged adjacent to the image side of the first intermediate lens group GM1, and a third intermediate lens group with negative refractive power is arranged adjacent to the image side of the second intermediate lens group. In this structure, the zoom optical system preferably satisfies the following condition (16). Here, the focal length of the second intermediate lens group with negative refractive power is set to fM2n. The focal length of the third intermediate lens group with negative refractive power is set to fM3n. By ensuring that the corresponding value of condition (16) is not below the lower limit, the negative refractive power of the second intermediate lens group will not become too strong, thus helping to suppress spherical aberration at the telephoto end. By ensuring that the corresponding value of condition (16) is not above the upper limit, the negative refractive power of the third intermediate lens group will not become too strong, thus helping to reduce the incident angle of the off-axis principal ray towards the image plane Sim.

[0195] 0.3<(-fM2n) / (-fM3n)<3 (16)

[0196] To obtain better properties, the lower limit of condition (16) is more preferably set to 0.5, more preferably 0.6, more preferably 0.7, more preferably 0.75, more preferably 0.8, and more preferably 0.85. To obtain better properties, the upper limit of condition (16) is more preferably set to 2.5, more preferably 2, more preferably 1.6, more preferably 1.5, more preferably 1.4, and more preferably 1.3.

[0197] The above-mentioned preferred structures and possible structures can be combined arbitrarily within the range of non-contradiction, and preferably selected appropriately according to the required specifications.

[0198] As an example, a preferred embodiment of the present invention is a zoom optical system as follows: it consists of a first lens group G1 with positive refractive power, a front group GF composed of one or two lens groups with negative refractive power, an intermediate group GM including multiple lens groups, and a final lens group GE, arranged sequentially from the object side to the image side. In the zoom optical system, the lens group closest to the object side of the intermediate group GM is the first intermediate lens group GM1 with positive refractive power. The intermediate group GM includes an aperture stop St. During zooming, all the intervals between adjacent lens groups change and satisfy the above condition (1).

[0199] Next, embodiments of the zoom optical system of the present invention will be described with reference to the accompanying drawings. Furthermore, the reference numerals labeled in each group of cross-sectional views of each embodiment are used independently in each embodiment to avoid complicating the description and drawings as the number of reference numerals increases. Therefore, even if the same reference numerals are used in the drawings of different embodiments, they do not necessarily represent the same structure.

[0200] [Example 1]

[0201] The structure and movement trajectory of the zoom optical system in Example 1 are shown in Figure 1 The illustrated method and structure are as described above, therefore some repetitive descriptions are omitted here. The zoom optical system of Embodiment 1, from the object side to the image side, consists of a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM, from the object side to the image side, consists of two lens groups: a first intermediate lens group GM1 with positive refractive power and a second intermediate lens group GM2 with negative refractive power.

[0202] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0203] Regarding the zoom optical system of Example 1, the basic lens data is shown in Table 1, the specifications and variable surface spacing are shown in Table 2, and the aspherical coefficients are shown in Table 3.

[0204] The following table contains basic lens data. The "Sn" column shows the surface numbering with the object-side surface designated as surface 1 and the numbering increasing sequentially towards the image side. The "R" column shows the radius of curvature of each surface. The "D" column shows the surface spacing along the optical axis between each surface and its image-side neighbor. The "Nd" column shows the refractive index of each lens relative to the d-line. The "νd" column shows the Abbe number of each lens based on the d-line. The "ED" column shows the effective diameter of each surface.

[0205] The table of embodiments described later is also included, and the "Material" column in the table of basic lens data is as follows. Regarding the specific lens described above, either "N200 glass" or "N216 glass" is listed in the "Material" column. As "N200 glass" and "N216 glass," the glass described in the proceedings of the 49th Optical Symposium (conference period: June 20-21, 2024, organized by the Optical Society of Japan) pp. 40-42 can be used.

[0206] For lenses other than certain specific lenses, in the "Material" column, resin lenses are listed as "plastic." For other lenses, the material name is listed before the period (."), followed by the name of the manufacturing company. The manufacturing company names are briefly shown in the table below: "OHARA" indicates OHARA INC.; "HOYA" indicates HOYA Corporation; and "CDGM" indicates Chengdu Guangming Optoelectronics Co., Ltd.

[0207] In the table of basic lens data, the sign of the radius of curvature of the convex surface facing the object is set to positive, and the sign of the radius of curvature of the convex surface facing the image is set to negative. In Table 1, the surface number and the term (St) are recorded in the surface number column corresponding to the aperture stop St. The value in the bottom column of column D in the table is the interval between the surface closest to the image and the image plane Sim. Regarding the variable surface interval during zoom, the notation DD[ ] is used, and the object-side surface number of the interval is marked in [ ] and recorded in the surface interval column.

[0208] Table 2 shows the zoom ratio Zr, focal length f, back focal length Bf, opening F-number FNo., maximum total field of view 2ω, and variable surface spacing, with the d-line as the reference. When the zoom optical system is a zoom lens, the zoom ratio has the same meaning as the zoom magnification. The [°] in the 2ω column indicates that the unit is degrees. In Table 2, the columns labeled "Wide", "Middle", and "Tele" show the values ​​for the wide-angle, intermediate focal length, and telephoto ends, respectively.

[0209] In the table of basic lens data, aspherical surfaces are marked with an asterisk (*), and the paraxial radius of curvature is recorded in the "Radius of Curvature" column. In Table 3, row Sn shows the surface number of the aspherical surface, and rows KA and Am show the aspherical coefficient values ​​for each aspherical surface. Furthermore, m in Am is an integer greater than or equal to 3 and varies from surface to surface. For example, in the 5th surface of Example 1, m = 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. The aspherical coefficient values ​​in Table 3, "E±n" (n: integer), represent "×10⁻¹⁰". ±n KA and Am are the aspheric coefficients in the aspheric formula expressed below.

[0210] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+ΣAm×h m

[0211] in,

[0212] Zd: Aspherical depth (the length of the perpendicular line from a point on the aspherical surface at height h to a plane that is tangent to the vertex of the aspherical surface and perpendicular to the optical axis Z).

[0213] h: Height (distance from the optical axis Z to the lens surface).

[0214] C: The reciprocal of the paraxial radius of curvature.

[0215] KA, Am: Aspheric coefficients

[0216] In aspherical form, Σ represents the sum related to m.

[0217] In the data in each table, degrees are used as the unit for angles and millimeters as the unit for lengths. However, optical systems can be used even at magnification or reduction scales, so other appropriate units can also be used. Furthermore, the values ​​shown in the tables below are rounded to a predetermined number of decimal places.

[0218]

[0219]

[0220]

[0221] exist Figure 3 The diagram shows the aberrations of the zoom optical system of Embodiment 1 when focused on an object at infinity. Figure 3 The image shows, from left to right, spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration. Figure 3 In the diagram, the upper section labeled "Wide" shows aberrations at the wide-angle end, the middle section labeled "Middle" shows aberrations at the intermediate focal length, and the lower section labeled "Tele" shows aberrations at the telephoto end. In the spherical aberration diagram, aberrations below the d-line, C-line, and F-line are represented by solid lines, long dashed lines, and short dashed lines, respectively. In the astigmatism diagram, aberrations below the d-line in the sagittal direction are represented by solid lines, and aberrations below the d-line in the meridional direction are represented by short dashed lines. In the distortion aberration diagram, aberrations along the d-line are represented by solid lines. In the chromatic aberration diagram, aberrations below the C-line and F-line are represented by long dashed lines and short dashed lines, respectively. In the spherical aberration diagram, the open F-value is shown after FNo.=. In other aberration diagrams, the maximum half-field angle is shown after ω=.

[0222] Unless otherwise specified, the notation, meaning, recording method, and illustration method of the data related to Embodiment 1 above are basically the same in the following embodiments, so repeated descriptions are omitted below.

[0223] [Example 2]

[0224] The structure and movement trajectory of the zoom optical system of Example 2 are shown below. Figure 4 The zoom optical system of Example 2 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, two lens groups: a first intermediate lens group GM1 with positive refractive power and a second intermediate lens group GM2 with negative refractive power.

[0225] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0226] Regarding the zoom optical system of Example 2, the basic lens data is shown in Table 4, the specifications and variable surface spacing are shown in Table 5, the aspherical coefficients are shown in Table 6, and the various aberrations are illustrated in Table 7. Figure 5 .

[0227]

[0228]

[0229]

[0230] [Example 3]

[0231] The structure and movement trajectory of the zoom optical system in Example 3 are shown below. Figure 6 The zoom optical system of Example 3 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of two lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power and a second intermediate lens group GM2 with negative refractive power.

[0232] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0233] Regarding the zoom optical system of Example 3, the basic lens data is shown in Table 7, the specifications and variable surface spacing are shown in Table 8, the aspherical coefficients are shown in Table 9, and the various aberrations are illustrated in Table 1. Figure 7 .

[0234]

[0235]

[0236]

[0237] [Example 4]

[0238] The structure and movement trajectory of the zoom optical system in Example 4 are shown below. Figure 8 The zoom optical system in Example 4 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of two lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power and a second intermediate lens group GM2 with negative refractive power.

[0239] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0240] Regarding the zoom optical system of Example 4, the basic lens data is shown in Table 10, the specifications and variable surface spacing are shown in Table 11, the aspherical coefficients are shown in Table 12, and the various aberrations are illustrated in Table 13. Figure 9 .

[0241]

[0242]

[0243]

[0244] [Example 5]

[0245] The structure and movement trajectory of the zoom optical system in Example 5 are shown below. Figure 10The zoom optical system of Example 5 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0246] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0247] Regarding the zoom optical system of Example 5, the basic lens data is shown in Table 13, the specifications and variable surface spacing are shown in Table 14, the aspherical coefficients are shown in Table 15, and the various aberrations are illustrated in Table 16. Figure 11 .

[0248]

[0249]

[0250]

[0251] [Example 6]

[0252] The structure and movement trajectory of the zoom optical system of Example 6 are shown below. Figure 12 The zoom optical system of Example 6 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of two lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power and a second intermediate lens group GM2 with negative refractive power.

[0253] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0254] Regarding the zoom optical system of Example 6, the basic lens data is shown in Table 16, the specifications and variable surface spacing are shown in Table 17, the aspherical coefficients are shown in Table 18, and the various aberrations are illustrated in Table 19. Figure 13 .

[0255]

[0256]

[0257]

[0258] [Example 7]

[0259] The structure and movement trajectory of the zoom optical system of Example 7 are shown below. Figure 14 The zoom optical system of Example 7 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0260] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the second intermediate lens group GM2 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0261] Regarding the zoom optical system of Example 7, the basic lens data is shown in Table 19, the specifications and variable surface spacing are shown in Table 20, the aspherical coefficients are shown in Table 21, and the various aberrations are illustrated in Table 22. Figure 15 .

[0262]

[0263]

[0264]

[0265] [Example 8]

[0266] The structure and movement trajectory of the zoom optical system of Example 8 are shown below. Figure 16The zoom optical system of Example 8 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0267] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0268] Regarding the zoom optical system of Example 8, the basic lens data is shown in Table 22, the specifications and variable surface spacing are shown in Table 23, the aspherical coefficients are shown in Table 24, and the various aberrations are illustrated in Table 25. Figure 17 .

[0269]

[0270]

[0271]

[0272] [Example 9]

[0273] The structure and movement trajectory of the zoom optical system of Example 9 are shown below. Figure 18 The zoom optical system of Example 9 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0274] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0275] Regarding the zoom optical system of Example 9, the basic lens data is shown in Table 25, the specifications and variable surface spacing are shown in Table 26, the aspherical coefficients are shown in Table 27, and the various aberrations are illustrated in Table 28. Figure 19 .

[0276]

[0277]

[0278]

[0279] [Example 10]

[0280] The structure and movement trajectory of the zoom optical system of Example 10 are shown in... Figure 20 The zoom optical system of Example 10 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0281] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0282] Regarding the zoom optical system of Example 10, the basic lens data is shown in Table 28, the specifications and variable surface spacing are shown in Table 29, the aspherical coefficients are shown in Table 30, and the various aberrations are illustrated in Table 28. Figure 21 .

[0283]

[0284]

[0285]

[0286] [Example 11]

[0287] The structure and movement trajectory of the zoom optical system of Example 11 are shown in... Figure 22The zoom optical system of Example 11 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0288] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the second intermediate lens group GM2 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0289] Regarding the zoom optical system of Example 11, the basic lens data is shown in Table 31, the specifications and variable surface spacing are shown in Table 32, the aspherical coefficients are shown in Table 33, and the various aberrations are illustrated in Table 34. Figure 23 .

[0290]

[0291]

[0292]

[0293] [Example 12]

[0294] The structure and movement trajectory of the zoom optical system of Example 12 are shown below. Figure 24 The zoom optical system of Example 12 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0295] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0296] Regarding the zoom optical system of Example 12, the basic lens data is shown in Table 34, the specifications and variable surface spacing are shown in Table 35, the aspherical coefficients are shown in Table 36, and the various aberrations are illustrated in Table 37. Figure 25 .

[0297]

[0298]

[0299]

[0300] [Example 13]

[0301] The structure and movement trajectory of the zoom optical system of Example 13 are shown below. Figure 26 The zoom optical system of Example 13 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0302] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0303] Regarding the zoom optical system of Example 13, the basic lens data is shown in Table 37, the specifications and variable surface spacing are shown in Table 38, the aspherical coefficients are shown in Table 39, and the various aberrations are illustrated in Table 30. Figure 27 .

[0304]

[0305]

[0306]

[0307] [Example 14]

[0308] The structure and movement trajectory of the zoom optical system of Example 14 are shown in... Figure 28The zoom optical system of Example 14 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0309] When zooming from the wide-angle end to the telephoto end, the final lens group GE remains fixed relative to the image plane Sim, while other lens groups change their spacing from adjacent lens groups and move along the optical axis Z. Furthermore, the first intermediate lens group GM1 and the third intermediate lens group GM3 move along the same trajectory when zooming from the wide-angle end to the telephoto end. The focusing group is composed of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the lens closest to the image side of the first intermediate lens group GM1.

[0310] Regarding the zoom optical system of Example 14, the basic lens data is shown in Table 40, the specifications and variable surface spacing are shown in Table 41, the aspherical coefficients are shown in Table 42, and the various aberrations are illustrated in Table 43. Figure 29 .

[0311]

[0312]

[0313]

[0314] [Example 15]

[0315] The structure and movement trajectory of the zoom optical system of Example 15 are shown below. Figure 30 The zoom optical system of Example 15 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, three lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0316] When zooming from the wide-angle end to the telephoto end, the final lens group GE remains fixed relative to the image plane Sim, while other lens groups change their spacing from adjacent lens groups and move along the optical axis Z. Furthermore, the first intermediate lens group GM1 and the third intermediate lens group GM3 move along the same trajectory when zooming from the wide-angle end to the telephoto end. The focusing group is composed of the second intermediate lens group GM2. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the lens closest to the image side of the first intermediate lens group GM1.

[0317] Regarding the zoom optical system of Example 15, the basic lens data is shown in Table 43, the specifications and variable surface spacing are shown in Table 44, the aspherical coefficients are shown in Table 45, and the various aberrations are illustrated in Table 46. Figure 31 .

[0318]

[0319]

[0320]

[0321] [Example 16]

[0322] The structure and movement trajectory of the zoom optical system of Example 16 are shown in... Figure 32 The zoom optical system of Example 16 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, four lens groups in sequence: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0323] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0324] Regarding the zoom optical system of Example 16, the basic lens data is shown in Table 46, the specifications and variable surface spacing are shown in Table 47, the aspherical coefficients are shown in Table 48, and the various aberrations are illustrated in Table 49. Figure 33 .

[0325]

[0326]

[0327]

[0328] [Example 17]

[0329] The structure and movement trajectory of the zoom optical system of Example 17 are shown in... Figure 34 The zoom optical system of Example 17 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, four lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0330] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0331] Regarding the zoom optical system of Example 17, the basic lens data is shown in Table 49, the specifications and variable surface spacing are shown in Table 50, the aspherical coefficients are shown in Table 51, and the various aberrations are illustrated in Table 52. Figure 35 .

[0332]

[0333]

[0334]

[0335] [Example 18]

[0336] The structure and movement trajectory of the zoom optical system of Example 18 are shown below. Figure 36The zoom optical system of Example 18 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of four lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0337] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0338] Regarding the zoom optical system of Example 18, the basic lens data is shown in Table 52, the specifications and variable surface spacing are shown in Table 53, the aspherical coefficients are shown in Table 54, and the various aberrations are illustrated in Table 55. Figure 37 .

[0339]

[0340]

[0341]

[0342] [Example 19]

[0343] The structure and movement trajectory of the zoom optical system of Example 19 are shown below. Figure 38 The zoom optical system of Example 19 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of four lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0344] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0345] Regarding the zoom optical system of Example 19, the basic lens data is shown in Table 55, the specifications and variable surface spacing are shown in Table 56, the aspherical coefficients are shown in Table 57, and the various aberrations are illustrated in Table 58. Figure 39 .

[0346]

[0347]

[0348]

[0349] [Example 20]

[0350] The structure and movement trajectory of the zoom optical system of Example 20 are shown in... Figure 40 The zoom optical system of Example 20 consists, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists, from the object side to the image side, four lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0351] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0352] Regarding the zoom optical system of Example 20, the basic lens data is shown in Table 58, the specifications and variable surface spacing are shown in Table 59, the aspherical coefficients are shown in Table 60, and the various aberrations are illustrated in Table 60. Figure 41 .

[0353]

[0354]

[0355]

[0356] [Example 21]

[0357] The structure and movement trajectory of the zoom optical system of Example 21 are shown below. Figure 42 The zoom optical system of Example 21 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, four lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0358] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0359] Regarding the zoom optical system of Example 21, the basic lens data is shown in Table 61, the specifications and variable surface spacing are shown in Table 62, the aspherical coefficients are shown in Table 63, and the various aberrations are illustrated in Table 64. Figure 43 .

[0360]

[0361]

[0362]

[0363] [Example 22]

[0364] The structure and movement trajectory of the zoom optical system of Example 22 are shown below. Figure 44The zoom optical system of Example 22 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with positive refractive power. The front lens group GF consists of a single lens group with negative refractive power. The intermediate lens group GM consists of, from the object side to the image side, four lens groups: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0365] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0366] Regarding the zoom optical system of Example 22, the basic lens data is shown in Table 64, the specifications and variable surface spacing are shown in Table 65, the aspherical coefficients are shown in Table 66, and the various aberrations are illustrated in Table 67. Figure 45 .

[0367]

[0368]

[0369]

[0370] [Example 23]

[0371] The structure and movement trajectory of the zoom optical system of Example 23 are shown below. Figure 46 The zoom optical system of Example 23 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of one lens group with negative refractive power. The intermediate lens group GM consists of four lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with negative refractive power, a third intermediate lens group GM3 with positive refractive power, and a fourth intermediate lens group GM4 with negative refractive power.

[0372] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1, the third intermediate lens group GM3, and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group is composed of the fourth intermediate lens group GM4. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side. The image stabilization group is composed of the second lens from the object side of the first intermediate lens group GM1.

[0373] Regarding the zoom optical system of Example 23, the basic lens data is shown in Table 67, the specifications and variable surface spacing are shown in Table 68, the aspherical coefficients are shown in Table 69, and the various aberrations are illustrated in Table 60. Figure 47 .

[0374]

[0375]

[0376]

[0377] [Example 24]

[0378] The structure and movement trajectory of the zoom optical system of Example 24 are shown in... Figure 48 The zoom optical system of Example 24 consists of, from the object side to the image side, a first lens group G1 with positive refractive power, a front lens group GF, an intermediate lens group GM, and a final lens group GE with negative refractive power. The front lens group GF consists of two lens groups: a first front lens group GF1 with negative refractive power and a second front lens group GF2 with negative refractive power. The intermediate lens group GM consists of three lens groups from the object side to the image side: a first intermediate lens group GM1 with positive refractive power, a second intermediate lens group GM2 with positive refractive power, and a third intermediate lens group GM3 with negative refractive power.

[0379] When zooming from the wide-angle end to the telephoto end, all lens groups move along the optical axis Z by changing the spacing between adjacent lens groups. Furthermore, the first intermediate lens group GM1 and the final lens group GE move along the same trajectory during zooming from the wide-angle end to the telephoto end. The focusing group consists of the third intermediate lens group GM3. When focusing from an object at infinity to the nearest object, the focusing group moves towards the image side.

[0380] Regarding the zoom optical system of Example 24, the basic lens data is shown in Table 70, the specifications and variable surface spacing are shown in Table 71, the aspherical coefficients are shown in Table 72, and the various aberrations are illustrated in Table 73. Figure 49 .

[0381]

[0382]

[0383]

[0384] Tables 73 to 76 show the corresponding values ​​of conditional expressions (1) to (5), (7) to (18), and (21) to (25) for the zoom optical systems of embodiments 1 to 24 described above. Table 77 shows the corresponding values ​​of conditional expressions (19) and (20) for “N200 glass” and “N216 glass” used in the above embodiments. The corresponding values ​​shown in Tables 73 to 77 can also be used as upper or lower limits of the conditional expressions to set the preferred range of the conditional expressions.

[0385]

[0386]

[0387]

[0388]

[0389]

[0390] Next, the imaging device according to the embodiments of the present invention will be described. Figure 50 and Figure 51 The diagram shows the external appearance of the camera 30 of the imaging device according to one embodiment of the present invention. Figure 50 This is a stereoscopic view of camera 30 viewed from the front side. Figure 51 This is a perspective view of the camera 30 as seen from the rear side. The camera 30 is a so-called mirrorless digital camera, which allows for the detachable mounting of an interchangeable lens 20. The interchangeable lens 20 is configured to include a zoom optical system 1 according to an embodiment of the present invention housed within a lens barrel.

[0391] The camera 30 includes a camera body 31. A shutter button 32 and a power button 33 are provided on the upper surface of the camera body 31. Furthermore, an operation unit 34, an operation unit 35, and a display unit 36 ​​are provided on the back of the camera body 31. The display unit 36 ​​can display the captured image and the image present in the field of view before shooting.

[0392] A photographic opening for light from the subject is provided at the center of the front surface of the camera body 31. A bayonet 37 is provided at a position corresponding to the photographic opening, through which the interchangeable lens 20 is mounted on the camera body 31.

[0393] An image sensor 38 is disposed within the camera body 31. The image sensor 38 outputs an image signal corresponding to the image of the subject formed by the interchangeable lens 20. The image sensor 38 may be, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). A signal processing circuit (not shown) and a recording medium (not shown) are disposed within the camera body 31. The signal processing circuit processes the image signal output from the image sensor 38 to generate an image. The recording medium is used to record the generated image. In the camera 30, still images or moving images can be captured by pressing the shutter button 32, and the image data obtained by this capture is recorded in the aforementioned recording medium.

[0394] The above description, through examples and embodiments, illustrates the technology of the present invention. However, the technology of the present invention is not limited to the above examples and embodiments, and various modifications are possible. For example, the radius of curvature, interplanar spacing, refractive index, Abbe number, and aspherical coefficient of each lens are not limited to the values ​​shown in the above embodiments, and other values ​​can be used.

[0395] Furthermore, the camera device involved in the embodiments of the present invention is not limited to the above examples, and can be configured in various ways, such as a camera other than a mirrorless camera, a film camera, a video camera, and a security camera.

[0396] The following notes further disclose the above implementation methods and embodiments.

[0397] [Postscript 1]

[0398] A zoom optical system comprises, from the object side to the image side, a first lens group with positive refractive power, a front group consisting of two or fewer lens groups with negative refractive power, a middle group containing multiple lens groups, and a final lens group.

[0399] The lens group closest to the object in the intermediate group is the first intermediate lens group with positive refractive power.

[0400] The intermediate group includes an aperture stop.

[0401] During zooming, the spacing between all adjacent lens groups changes.

[0402] When the focal length of the front group is set to fF, with the wide-angle end focused on an object at infinity,

[0403] When the focal length of the first lens group is set to f1...

[0404] The following condition (1) is satisfied:

[0405] 0.04<(-fF) / f1<0.4 (1).

[0406] [Postscript 2]

[0407] According to the zoom optical system described in Appendix 1, wherein,

[0408] When the focal length of the first intermediate lens group is set to fM1...

[0409] The following condition (2) is satisfied:

[0410] 0.1 < fM1 / f1 < 0.8 (2).

[0411] [Postscript 3]

[0412] According to the zoom optical system described in Appendix 1 or 2, wherein,

[0413] When the focal length of the zoom optical system is set to fw at the wide-angle end and focused on an object at infinity,

[0414] The following condition (3) is satisfied:

[0415] 0.05 < fw / f1 < 0.5 (3).

[0416] [Postscript 4]

[0417] According to any one of Appendices 1 to 3, the zoom optical system wherein...

[0418] When the focal length of the zoom optical system is set to fw at the wide-angle end and focused on an object at infinity,

[0419] The following condition (4) is satisfied:

[0420] 0.4<fw / (-fF)<2 (4).

[0421] [Postscript 5]

[0422] According to any one of Appendices 1 to 4, the zoom optical system wherein...

[0423] The intermediate group includes at least one lens group with negative refractive power.

[0424] The focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0425] When the focal length of the lens group closest to the image side in the lens group with negative refractive power included in the intermediate group is set to fMn,

[0426] The following condition (5) is satisfied:

[0427] 0.05<fw / (-fMn)<1.5 (5).

[0428] [Postscript 6]

[0429] According to any one of Appendices 1 to 5, the zoom optical system wherein...

[0430] The zoom optical system includes 13 or more lenses and 17 or fewer lenses.

[0431] [Postscript 7]

[0432] According to any one of Appendices 1 to 6, in the zoom optical system, wherein,

[0433] When the refractive index of the positive lens of the first lens group relative to the d-line is set to Nd1p...

[0434] All positive lenses in the first lens group satisfy the following condition (6):

[0435] 1.4 < Nd1p < 1.62 (6).

[0436] [Postscript 8]

[0437] According to any one of Appendices 1 to 7, the zoom optical system wherein...

[0438] The intermediate group includes at least one lens group with negative refractive power.

[0439] When the focal length of the lens group closest to the image side among the lens groups with negative refractive power included in the intermediate group is set to fMn.

[0440] The following condition (7) is satisfied:

[0441] 0.1<(-fF) / (-fMn)<2 (7).

[0442] [Postscript 9]

[0443] According to any one of Appendices 1 to 8, the zoom optical system wherein,

[0444] The focal length of the zoom optical system is set to ft when the focus is on an object at infinity at the telephoto end.

[0445] When the focal length of the zoom optical system is set to fw in the state of focusing on an object at infinity at the wide-angle end,

[0446] The following condition (8) is satisfied:

[0447] 2 < ft / fw < 20 (8).

[0448] [Postscript 10]

[0449] According to any one of Appendices 1 to 9, the zoom optical system wherein...

[0450] When the focal length of the first intermediate lens group is set to fM1...

[0451] The following condition (9) is satisfied:

[0452] 0.05<(-fF) / fM1<2 (9).

[0453] [Postscript 11]

[0454] According to any one of Appendices 1 to 10, in the zoom optical system, wherein,

[0455] The focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end.

[0456] When the focal length of the final lens group is set to fE...

[0457] The following condition (10) is satisfied:

[0458] -1.5<fw / fE<1.5 (10).

[0459] [Postscript 12]

[0460] According to any one of Appendices 1 to 11, the zoom optical system wherein,

[0461] At least one lens group included in the intermediate group and the final lens group move along the optical axis along the same trajectory during zooming from the wide-angle end to the telephoto end.

[0462] The lens groups that move along the same trajectory are not arranged adjacently.

[0463] [Postscript 13]

[0464] According to the zoom optical system described in Appendix 12, wherein,

[0465] The two lens groups included in the intermediate group and the final lens group move along the optical axis along the same trajectory during zooming from the wide-angle end to the telephoto end.

[0466] The lens groups that move along the same trajectory are not arranged adjacently.

[0467] [Postscript 14]

[0468] According to any one of Appendices 1 to 13, the zoom optical system wherein...

[0469] A second intermediate lens group with positive refractive power is disposed adjacent to the image side of the first intermediate lens group within the intermediate group.

[0470] When the focal length of the first intermediate lens group is set to fM1...

[0471] When the focal length of the second intermediate lens group is set to fM2p...

[0472] The following condition (11) is satisfied:

[0473] 0.1<fM1 / fM2p<4 (11).

[0474] [Postscript 15]

[0475] According to the zoom optical system described in Appendix 14, wherein...

[0476] A third intermediate lens group with positive refractive power is disposed adjacent to the image side of the second intermediate lens group within the intermediate group.

[0477] When the focal length of the second intermediate lens group is set to fM2p

[0478] When the focal length of the third intermediate lens group is set to fM3p...

[0479] The following condition (12) is satisfied:

[0480] 1<fM2p / fM3p<15 (12).

[0481] [Postscript 16]

[0482] According to the zoom optical system described in Appendix 14, wherein...

[0483] A third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group within the intermediate group.

[0484] When the focal length of the second intermediate lens group is set to fM2p

[0485] When the focal length of the third intermediate lens group is set to fM3n...

[0486] The following condition (13) is satisfied:

[0487] 0.1<fM2p / (-fM3n)<1 (13).

[0488] [Postscript 17]

[0489] According to any one of Appendices 1 to 13, the zoom optical system wherein...

[0490] A second intermediate lens group with negative refractive power is disposed adjacent to the image side of the first intermediate lens group within the intermediate group.

[0491] When the focal length of the first intermediate lens group is set to fM1...

[0492] When the focal length of the second intermediate lens group is set to fM2n...

[0493] The following condition (14) is satisfied:

[0494] 0.1<fM1 / (-fM2n)<2 (14).

[0495] [Postscript 18]

[0496] According to the zoom optical system described in Appendix 17, wherein,

[0497] A third intermediate lens group with positive refractive power is disposed adjacent to the image side of the second intermediate lens group within the intermediate group.

[0498] When the focal length of the second intermediate lens group is set to fM2n...

[0499] When the focal length of the third intermediate lens group is set to fM3p...

[0500] The following condition (15) is satisfied:

[0501] 1<(-fM2n) / fM3p<15 (15).

[0502] [Postscript 19]

[0503] According to the zoom optical system described in Appendix 17, wherein,

[0504] A third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group within the intermediate group.

[0505] When the focal length of the second intermediate lens group is set to fM2n...

[0506] When the focal length of the third intermediate lens group is set to fM3n...

[0507] The following condition (16) is satisfied:

[0508] 0.3<(-fM2n) / (-fM3n)<3 (16).

[0509] [Postscript 20]

[0510] A camera device comprising a zoom optical system as described in any one of Appendices 1 to 19.

Claims

1. A zoom optical system comprising, from the object side to the image side, a first lens group with positive refractive power, a front group consisting of two or fewer lens groups with negative refractive power, a middle group comprising multiple lens groups, and a final lens group. The lens group closest to the object in the intermediate group is the first intermediate lens group with positive refractive power. The intermediate group includes an aperture stop. During zooming, the spacing between all adjacent lens groups changes. When the focal length of the front group is set to fF, with the wide-angle end focused on an object at infinity, When the focal length of the first lens group is set to f1... The following condition (1) is satisfied: 0.04<(-fF) / f1<0.4 (1).

2. The zoom optical system according to claim 1, wherein, When the focal length of the first intermediate lens group is set to fM1... The following condition (2) is satisfied: 0.1 < fM1 / f1 < 0.8 (2).

3. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the zoom optical system is set to fw at the wide-angle end and focused on an object at infinity, The following condition (3) is satisfied: 0.05 < fw / f1 < 0.5 (3).

4. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the zoom optical system is set to fw at the wide-angle end and focused on an object at infinity, The following condition (4) is satisfied: 0.4<fw / (-fF)<2 (4).

5. The zoom optical system according to claim 1 or 2, wherein, The intermediate group includes at least one lens group with negative refractive power. The focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the lens group closest to the image side in the lens group with negative refractive power included in the intermediate group is set to fMn, The following condition (5) is satisfied: 0.05<fw / (-fMn)<1.5 (5).

6. The zoom optical system according to claim 1 or 2, wherein, The zoom optical system includes 13 or more lenses and 17 or fewer lenses.

7. The zoom optical system according to claim 1 or 2, wherein, When the refractive index of the positive lens of the first lens group relative to the d-line is set to Nd1p... All positive lenses in the first lens group satisfy the following condition (6): 1.4 < Nd1p < 1.62 (6).

8. The zoom optical system according to claim 1 or 2, wherein, The intermediate group includes at least one lens group with negative refractive power. When the focal length of the lens group closest to the image side among the lens groups with negative refractive power included in the intermediate group is set to fMn. The following condition (7) is satisfied: 0.1<(-fF) / (-fMn)<2 (7).

9. The zoom optical system according to claim 1 or 2, wherein, The focal length of the zoom optical system is set to ft when the focus is on an object at infinity at the telephoto end. When the focal length of the zoom optical system is set to fw in the state of focusing on an object at infinity at the wide-angle end, The following condition (8) is satisfied: 2 < ft / fw < 20 (8).

10. The zoom optical system according to claim 1 or 2, wherein, When the focal length of the first intermediate lens group is set to fM1... The following condition (9) is satisfied: 0.05<(-fF) / fM1<2 (9).

11. The zoom optical system according to claim 1 or 2, wherein, The focal length of the zoom optical system is set to fw when focusing on an object at infinity at the wide-angle end. When the focal length of the final lens group is set to fE... The following condition (10) is satisfied: -1.5<fw / fE<1.5 (10).

12. The zoom optical system according to claim 1 or 2, wherein, At least one lens group included in the intermediate group and the final lens group move along the optical axis along the same trajectory during zooming from the wide-angle end to the telephoto end. The lens groups that move along the same trajectory are not arranged adjacently.

13. The zoom optical system according to claim 12, wherein, The two lens groups included in the intermediate group and the final lens group move along the optical axis along the same trajectory during zooming from the wide-angle end to the telephoto end. The lens groups that move along the same trajectory are not arranged adjacently.

14. The zoom optical system according to claim 1 or 2, wherein, Within the intermediate group, a second intermediate lens group with positive refractive power is disposed adjacent to the image side of the first intermediate lens group. When the focal length of the first intermediate lens group is set to fM1... When the focal length of the second intermediate lens group is set to fM2p... The following condition (11) is satisfied: 0.1<fM1 / fM2p<4 (11).

15. The zoom optical system according to claim 14, wherein, Within the intermediate group, a third intermediate lens group with positive refractive power is disposed adjacent to the image side of the second intermediate lens group. When the focal length of the third intermediate lens group is set to fM3p... The following condition (12) is satisfied: 1<fM2p / fM3p<15 (12).

16. The zoom optical system according to claim 14, wherein, Within the intermediate group, a third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group. When the focal length of the third intermediate lens group is set to fM3n... The following condition (13) is satisfied: 0.1<fM2p / (-fM3n)<1 (13).

17. The zoom optical system according to claim 1 or 2, wherein, Within the intermediate group, a second intermediate lens group with negative refractive power is disposed adjacent to the image side of the first intermediate lens group. When the focal length of the first intermediate lens group is set to fM1... When the focal length of the second intermediate lens group is set to fM2n... The following condition (14) must be satisfied: 0.1<fM1 / (-fM2n)<2 (14).

18. The zoom optical system according to claim 17, wherein, Within the intermediate group, a third intermediate lens group with positive refractive power is disposed adjacent to the image side of the second intermediate lens group. When the focal length of the third intermediate lens group is set to fM3p... The following condition (15) is satisfied: 1<(-fM2n) / fM3p<15 (15).

19. The zoom optical system according to claim 17, wherein, Within the intermediate group, a third intermediate lens group with negative refractive power is disposed adjacent to the image side of the second intermediate lens group. When the focal length of the third intermediate lens group is set to fM3n... The following condition (16) is satisfied: 0.3<(-fM2n) / (-fM3n)<3 (16).

20. A camera device comprising the zoom optical system of any one of claims 1 to 19.

Images