WO2024219127A1 - 変倍光学系および撮像装置 - Google Patents

変倍光学系および撮像装置 Download PDF

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Publication number
WO2024219127A1
WO2024219127A1 PCT/JP2024/010312 JP2024010312W WO2024219127A1 WO 2024219127 A1 WO2024219127 A1 WO 2024219127A1 JP 2024010312 W JP2024010312 W JP 2024010312W WO 2024219127 A1 WO2024219127 A1 WO 2024219127A1
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WIPO (PCT)
Prior art keywords
optical system
variable magnification
magnification optical
lens group
conditional expression
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Ceased
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PCT/JP2024/010312
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English (en)
French (fr)
Japanese (ja)
Inventor
雅人 近藤
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Fujifilm Corp
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Fujifilm Corp
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Priority to JP2025515097A priority Critical patent/JPWO2024219127A1/ja
Priority to CN202480025969.6A priority patent/CN120936927A/zh
Publication of WO2024219127A1 publication Critical patent/WO2024219127A1/ja
Priority to US19/358,396 priority patent/US20260050145A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
    • G02B15/1465—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being negative
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Definitions

  • the technology disclosed herein relates to a variable magnification optical system and an imaging device.
  • variable magnification optical systems that can be used in imaging devices such as digital cameras.
  • the present disclosure provides a variable magnification optical system that is compact and maintains good optical performance over the entire range of magnification, and an imaging device that includes this variable magnification optical system.
  • a first aspect of the present disclosure is a variable power optical system comprising, in order from the object side to the image side, a first lens group having negative refractive power, an intermediate group consisting of a plurality of lens groups, and a final lens group having refractive power, wherein, during variable power, a distance between the first lens group and the intermediate group changes, a distance between the intermediate group and the final lens group changes, and all distances between adjacent lens groups in the intermediate group change, and a focusing group that moves along the optical axis during focusing is disposed closer to the image side than the first lens group, 2 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 6.5 (1) 0.15 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.5 (2) 0.1 ⁇ Dsum/(TLw-Bfw) ⁇ 0.8 (3)
  • the conditional expressions (1), (2), and (3) expressed by the following formulae are satisfied.
  • conditional expressions (1), (2), and (3) are defined as follows.
  • the sum of the distance on the optical axis from the lens surface of the first lens group closest to the object to the lens surface of the final lens group closest to the image when focused on an object at infinity at the wide-angle end and the back focus in the air-equivalent distance of the entire system is defined as TLw.
  • the focal length of the entire system when focused on an object at infinity at the wide-angle end is defined as fw.
  • the maximum half angle of view when focused on an object at infinity at the wide-angle end is defined as ⁇ w.
  • the back focus of the entire system when focused on an object at infinity at the wide-angle end is defined as Bfw.
  • the sum of the thicknesses on the optical axis of all lens groups is defined as Dsum.
  • a second aspect of the present disclosure provides a variable magnification optical system according to the first aspect, 2.6 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 5.5 (1-1) The condition (1-1) is satisfied.
  • a third aspect of the present disclosure is a variable magnification optical system according to the second aspect, 2.8 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 5 (1-2) The condition (1-2) is satisfied.
  • a fourth aspect of the present disclosure is a variable magnification optical system according to the third aspect, 3.1 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 4.5 (1-3) The condition (1-3) is satisfied.
  • a fifth aspect of the present disclosure provides a variable magnification optical system according to the fourth aspect, 3.2 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 4.25 (1-4)
  • the condition (1-4) expressed by the following expression is satisfied.
  • a sixth aspect of the present disclosure provides the variable magnification optical system of the first aspect, 0.2 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.25 (2-1) The condition (2-1) is satisfied.
  • a seventh aspect of the present disclosure is a variable magnification optical system according to the sixth aspect, 0.25 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.1 (2-2) The condition (2-2) is satisfied.
  • An eighth aspect of the present disclosure is a variable magnification optical system according to the seventh aspect, 0.35 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1 (2-3) The condition (2-3) is satisfied.
  • a ninth aspect of the present disclosure is a variable magnification optical system according to the first aspect, 0.15 ⁇ Dsum/(TLw-Bfw) ⁇ 0.6 (3-1) The condition (3-1) is satisfied.
  • a tenth aspect of the present disclosure is the variable magnification optical system of the ninth aspect, 0.21 ⁇ Dsum/(TLw-Bfw) ⁇ 0.54 (3-2) The condition (3-2) is satisfied.
  • variable magnification optical system when the maximum aperture F-number in a state in which the lens is focused on an object at infinity at the wide-angle end is FNow, 2.3 ⁇ FNow/tan ⁇ w ⁇ 7 (4)
  • the conditional expression (4) expressed by the following formula is satisfied.
  • variable power optical system when the focal length of the entire system at the telephoto end is focused on an object at infinity, the following formula is satisfied: 0.45 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 3 (5)
  • the conditional expression (5) expressed by the following formula is satisfied.
  • a thirteenth aspect of the present disclosure is a variable power optical system according to the twelfth aspect, 0.58 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 2.2 (5-1) The condition (5-1) is satisfied.
  • a fourteenth aspect of the present disclosure is the variable magnification optical system of the thirteenth aspect, 0.73 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.4 (5-2) The condition (5-2) is satisfied.
  • a fifteenth aspect of the present disclosure is a variable power optical system according to the fourteenth aspect, 0.75 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.35 (5-3) The condition (5-3) is satisfied.
  • variable power optical system in the variable power optical system according to the first aspect, when the focal length of the entire system at the telephoto end focused on an object at infinity is ft and the focal length of the first lens group is f1, -10 ⁇ ft/f1 ⁇ -0.4 (6) The conditional expression (6) is satisfied.
  • a seventeenth aspect of the present disclosure is the variable magnification optical system of the sixteenth aspect, -7 ⁇ ft/f1 ⁇ -0.9 (6-1) The condition (6-1) is satisfied.
  • An eighteenth aspect of the present disclosure is a variable magnification optical system according to the third aspect, 0.35 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1 (2-3) The condition (2-3) is satisfied.
  • a nineteenth aspect of the present disclosure is the variable magnification optical system of the eighteenth aspect, 0.21 ⁇ Dsum/(TLw-Bfw) ⁇ 0.54 (3-2) The condition (3-2) is satisfied.
  • a twentieth aspect of the present disclosure is a variable magnification optical system according to the nineteenth aspect, in which, when the maximum aperture F-number in a state in which the lens is focused on an object at infinity at the wide-angle end is FNow, 2.9 ⁇ FNow/tan ⁇ w ⁇ 6 (4-1) The condition (4-1) is satisfied.
  • a twenty-first aspect of the present disclosure is a variable power optical system according to the twentieth aspect, in which, when the focal length of the entire system at the telephoto end is focused on an object at infinity, the following relationship is satisfied: 0.75 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.35 (5-3) The condition (5-3) is satisfied.
  • a twenty-second aspect of the present disclosure provides a variable power optical system according to the twenty-first aspect, in which, when the focal length of the entire system at the telephoto end is focused on an object at infinity, is denoted by ft and the focal length of the first lens group is denoted by f1, -5 ⁇ ft/f1 ⁇ -1.1 (6-2) The condition (6-2) is satisfied.
  • a twenty-third aspect of the present disclosure is a variable power optical system according to the twenty-second aspect, wherein the intermediate group includes a vibration reduction group that moves in a direction intersecting with the optical axis during image blur correction, and when the focal length of the vibration reduction group is put, 0.3 ⁇ ft/
  • the conditional expression (7) expressed by the following formula is satisfied.
  • the 24th aspect of the present disclosure is a variable power optical system according to the 23rd aspect, in which the vibration reduction group is disposed closest to the object side within the lens group located closest to the object side of the intermediate group.
  • a twenty-fifth aspect of the present disclosure is a variable magnification optical system according to the fourth aspect, 0.25 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.1 (2-2) The condition (2-2) is satisfied.
  • a twenty-sixth aspect of the present disclosure is the variable magnification optical system of the twenty-fifth aspect, 0.21 ⁇ Dsum/(TLw-Bfw) ⁇ 0.54 (3-2) The condition (3-2) is satisfied.
  • a twenty-seventh aspect of the present disclosure is a variable magnification optical system according to the twenty-sixth aspect, in which, when the maximum aperture F-number in a state in which the lens is focused on an object at infinity at the wide-angle end is FNow, 2.9 ⁇ FNow/tan ⁇ w ⁇ 6 (4-1) The condition (4-1) is satisfied.
  • a twenty-eighth aspect of the present disclosure provides a variable power optical system according to the twenty-seventh aspect, wherein, when the focal length of the entire system at the telephoto end is focused on an object at infinity, the following relationship is satisfied: 0.73 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.4 (5-2) The condition (5-2) is satisfied.
  • a twenty-ninth aspect of the present disclosure is the variable power optical system of the twenty-eighth aspect, wherein, when the focal length of the first lens group is f1, -5 ⁇ ft/f1 ⁇ -1.1 (6-2) The condition (6-2) is satisfied.
  • a 30th aspect of the present disclosure is a variable power optical system according to the first aspect, in which the intermediate group includes, in order from the object side to the image side, at least a first intermediate lens group having positive refractive power, a second intermediate lens group having refractive power, and a third intermediate lens group having refractive power.
  • a thirty-first aspect of the present disclosure is the variable magnification optical system of the thirtieth aspect, 2.8 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 5 (1-2) The condition (1-2) is satisfied.
  • a thirty-second aspect of the present disclosure is the variable magnification optical system of the thirty-first aspect, 0.18 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.25 (2-1A)
  • the condition (2-1A) represented by the following expression is satisfied.
  • a thirty-third aspect of the present disclosure provides a variable power optical system according to the thirty-second aspect, in which, when a focal length of the entire system at a telephoto end focused on an object at infinity is ft, 0.63 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.85 (5-1A)
  • the condition (5-1A) represented by the following expression is satisfied.
  • a thirty-fourth aspect of the present disclosure is a variable power optical system according to the thirty-third aspect, wherein, when the focal length of the first lens group is f1, -7 ⁇ ft/f1 ⁇ -0.9 (6-1) The condition (6-1) is satisfied.
  • a thirty-fifth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein, when the focal length of the first lens group is f1, -3.5 ⁇ fw/f1 ⁇ -0.2 (8) The conditional expression (8) is satisfied.
  • a thirty-sixth aspect of the present disclosure is a variable power optical system according to the first aspect, in which, when the focal length of the entire system at the telephoto end is focused on an object at infinity, ft, and the focal length of the middle group at the wide-angle end is focused on an object at infinity, fMw, 0.2 ⁇ ft/fMw ⁇ 7.5 (9) The conditional expression (9) is satisfied.
  • variable power optical system in the variable power optical system according to the first aspect, when the focal length of the entire system at the telephoto end focused on an object at infinity is ft and the focal length of the lens group located closest to the image side in the intermediate group is fme, -16 ⁇ ft/fme ⁇ -0.15 (10) The condition (10) is satisfied.
  • a thirty-eighth aspect of the present disclosure is a variable power optical system according to the first aspect, in which, when the focal length of the entire system at the telephoto end focused on an object at infinity is ft and the focal length of the final lens group is fE, -2 ⁇ ft/fE ⁇ 2.5 (11)
  • the conditional expression (11) expressed by the following expression is satisfied.
  • a thirty-ninth aspect of the present disclosure is a variable power optical system according to the first aspect, in which, when the focal length of the first lens group is f1 and the focal length of the lens group located closest to the object among the intermediate groups is fm1, -5 ⁇ f1/fm1 ⁇ -0.05 (12)
  • the conditional expression (12) expressed by the following expression is satisfied.
  • a fortieth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein the lens group located closest to the object side in the intermediate group has positive refractive power, and when the focal length of the lens group located closest to the object side in the intermediate group is fm1 and the focal length of the lens group located closest to the image side in the intermediate group is fme, -15 ⁇ fm1/fme ⁇ -0.05 (13) The conditional expression (13) is satisfied.
  • variable magnification optical system of the first aspect when the maximum aperture F-number when focused on an object at infinity at the telephoto end is FNot and the focal length of the entire system when focused on an object at infinity at the telephoto end is ft, 1.5 ⁇ FNot/(ft/fw) ⁇ 7 (14)
  • the conditional expression (14) expressed by the following expression is satisfied.
  • variable power optical system of the first aspect when the focal length of the entire system at the telephoto end is focused on an object at infinity, ft is taken as the focal length, and when the maximum half angle of view at the telephoto end is focused on an object at infinity, ⁇ t is taken as the maximum half angle of view, 0.4 ⁇ fw/(ft ⁇ tan ⁇ t) ⁇ 2.7 (15)
  • the conditional expression (15) expressed by the following expression is satisfied.
  • a forty-third aspect of the present disclosure is a variable power optical system according to the first aspect, wherein the lens group located closest to the image side among the intermediate groups has negative refractive power, and when the focal length of the lens group located closest to the image side among the intermediate groups is fme and the focal length of the final lens group is fE, -9 ⁇ fme/fE ⁇ -0.05 (16)
  • the conditional expression (16) expressed by the following expression is satisfied.
  • a forty-fourth aspect of the present disclosure is a variable power optical system according to the third aspect, 0.25 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.1 (2-2) The condition (2-2) is satisfied.
  • a forty-fifth aspect of the present disclosure is a variable power optical system according to the forty-fourth aspect, in which, when a focal length of the entire system at a telephoto end in a state where the focal length is focused on an object at infinity is ft, 0.58 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 2.2 (5-1) The condition (5-1) is satisfied.
  • variable power optical system of the forty-fifth aspect when the focal length of the lens unit located closest to the image side of the intermediate group is denoted by fme, -10 ⁇ ft/fme ⁇ -1.5 (10-1) The condition (10-1) is satisfied.
  • a forty-seventh aspect of the present disclosure is a variable power optical system according to the forty-sixth aspect, wherein, when the focal length of the final lens group is fE, 0.1 ⁇ ft/fE ⁇ 0.7 (11-1) The condition (11-1) is satisfied.
  • a forty-eighth aspect of the present disclosure is the variable magnification optical system of the forty-seventh aspect, -3 ⁇ fme/fE ⁇ -0.35 (16-1) The condition (16-1) is satisfied.
  • a forty-ninth aspect of the present disclosure is a variable power optical system according to the first aspect, in which, when the focal length of the first lens group is f1 and the focal length of the middle group when focused on an object at infinity at the wide-angle end is fMw, 0.2 ⁇ (-f1)/fMw ⁇ 5 (17) The condition (17) is satisfied.
  • a fiftieth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein, when the focal length of the first lens group is f1 and the focal length of the entire system in a state where the focal length is focused on an object at infinity at the telephoto end is ft, 0.3 ⁇ (-f1)/(fw ⁇ ft) 1/2 ⁇ 2 (18) The conditional expression (18) is satisfied.
  • variable power optical system of the first aspect when the focal length of the intermediate group when focused on an object at infinity at the wide-angle end is fMw, and the focal length of the entire system when focused on an object at infinity at the telephoto end is ft, 0.15 ⁇ fMw/(fw ⁇ ft) 1/2 ⁇ 2 (19) The condition (19) is satisfied.
  • a fifty-second aspect of the present disclosure is a variable power optical system according to the first aspect, in which, when the focal length of the first lens group is f1, the focal length of the entire system in a state in which the lens is focused on an object at infinity at the telephoto end is ft, and the maximum aperture F-number in a state in which the lens is focused on an object at infinity at the telephoto end is FNot, 1 ⁇ (-f1)/(ft/FNot) ⁇ 12 (20)
  • the conditional expression (20) expressed by the following expression is satisfied.
  • a fifty-third aspect of the present disclosure is a variable magnification optical system according to the first aspect, 2.5 ⁇ TLw/fw ⁇ 7 (21)
  • the conditional expression (21) expressed by the following expression is satisfied.
  • variable power optical system in the variable power optical system according to the first aspect, when the focal length of the entire system at the telephoto end focused on an object at infinity is ft and the focal length of the focusing group is ffoc, 0.3 ⁇ ft/
  • the conditional expression (22) expressed by the following expression is satisfied.
  • a fifty-fifth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein, when the focal length of the focusing group is ffoc, 0.15 ⁇ fw/
  • the conditional expression (23) expressed by the following expression is satisfied.
  • a fifty-sixth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein the focusing group is composed of one lens, and when the Abbe number based on the d-line of the lens constituting the focusing group is ⁇ dfoc, 20 ⁇ dfoc ⁇ 75 (24)
  • the conditional expression (24) expressed by the following expression is satisfied.
  • a fifty-seventh aspect of the present disclosure is a variable power optical system according to the first aspect, in which the intermediate group includes an aperture stop, and the distance on the optical axis from the surface of the first lens group closest to the object to the aperture stop when focused on an object at infinity at the wide-angle end is denoted as DDL1STw: 0.18 ⁇ DDL1STw/TLw ⁇ 0.8 (25)
  • DDL1STw 0.18 ⁇ DDL1STw/TLw ⁇ 0.8
  • variable magnification optical system of the first aspect when the distance on the optical axis between the first lens group and the intermediate group in a state in which the lens is focused on an object at infinity at the wide-angle end is DDG1Mw, and when the distance on the optical axis between the first lens group and the intermediate group in a state in which the lens is focused on an object at infinity at the telephoto end is DDG1Mt, 0.07 ⁇
  • the conditional expression (26) expressed by the following expression is satisfied.
  • a fifty-ninth aspect of the present disclosure is, in the variable magnification optical system of the first aspect, when the paraxial radius of curvature of the object side surface of the negative lens closest to the object among the negative lenses included in the first lens group is R1nf, and the paraxial radius of curvature of the image side surface of the negative lens closest to the object among the negative lenses included in the first lens group is R1nr, 0.4 ⁇ (R1nf+R1nr)/(R1nf-R1nr) ⁇ 5 (27) The condition (27) is satisfied.
  • a sixtieth aspect of the present disclosure provides a variable power optical system according to the first aspect, wherein, when the sum of the thicknesses on the optical axis of all the lenses in the first lens group is d1sum, the focal length of the entire system when focused on an object at infinity at the telephoto end is ft, and the maximum aperture F-number when focused on an object at infinity at the telephoto end is FNot, 0.15 ⁇ d1sum/(ft/FNot) ⁇ 4 (28) The conditional expression (28) is satisfied.
  • a 61st aspect of the present disclosure is a variable magnification optical system according to the 1st aspect, wherein the variable magnification optical system includes an aperture stop, the focal length of the first lens group is f1, and a composite focal length from the lens closest to the object in the first lens group to the aperture stop in a state focused on an object at infinity at the wide-angle end is fL1STw: -3 ⁇ f1/fL1STw ⁇ -0.1 (29) The condition (29) is satisfied.
  • a 62nd aspect of the present disclosure is a variable magnification optical system according to the 1st aspect, wherein when the variable magnification optical system includes an aperture stop, and a composite focal length from the lens closest to the object in the first lens group to the aperture stop in a state focused on an object at infinity at the wide-angle end is fL1STw, 0.1 ⁇ fw/fL1STw ⁇ 3.2 (30)
  • the conditional expression (30) expressed by the following expression is satisfied.
  • variable magnification optical system in the variable magnification optical system according to the first aspect, when the refractive index of the negative lens closest to the object side among the negative lenses included in the first lens group is N1n with respect to the d-line, 1.55 ⁇ N1n ⁇ 2 (31)
  • the conditional expression (31) expressed by the following expression is satisfied.
  • variable magnification optical system in the variable magnification optical system according to the first aspect, when the maximum aperture F-number in a state in which the lens is focused on an object at infinity at the wide-angle end is FNow, 1 ⁇ (Dsum/TLw) ⁇ FNow ⁇ 2.5 (32)
  • the conditional expression (32) expressed by the following expression is satisfied.
  • a sixty-fifth aspect of the present disclosure is a variable power optical system according to the first aspect, wherein, when the thickness of the focusing group on the optical axis is Dfoc, 0.01 ⁇ Dfoc/(fw ⁇ tan ⁇ w) ⁇ 0.25 (33)
  • the conditional expression (33) expressed by the following expression is satisfied.
  • a 66th aspect of the present disclosure is a variable magnification optical system according to the first aspect, wherein, when the sum of the thicknesses on the optical axis of all the lenses in the first lens group is d1sum and the focal length of the first lens group is f1, 0.045 ⁇ d1sum/
  • the conditional expression (34) expressed by the following expression is satisfied.
  • the 67th aspect of the present disclosure is a variable magnification optical system according to the first aspect, in which the final lens group is fixed relative to the image plane during magnification.
  • the 68th aspect of the present disclosure is a variable power optical system according to the first aspect, in which the final lens group consists of one positive lens.
  • variable magnification optical system according to the first aspect, in which the variable magnification optical system includes 7 or more lenses and 11 or less lenses.
  • a seventieth aspect of the present disclosure is a variable magnification optical system according to the sixty-ninth aspect, in which the variable magnification optical system includes seven or more lenses and nine or less lenses.
  • the 71st aspect of the present disclosure is a variable power optical system according to the first aspect, in which the first lens group is made up of three single lenses that are not cemented together.
  • the 73rd aspect of the present disclosure is a variable power optical system according to the first aspect, in which the focusing group is made up of two lenses.
  • the 74th aspect of the present disclosure is a variable power optical system according to the first aspect, in which the focusing group is made up of one lens.
  • the 75th aspect of the present disclosure is an imaging device equipped with a variable magnification optical system according to any one of the first to 74th aspects.
  • the invention may also include lenses that have substantially no refractive power, optical elements other than lenses such as apertures, filters, and cover glasses, as well as mechanical parts such as lens flanges, lens barrels, image sensors, and image stabilization mechanisms.
  • a lens group having positive refractive power and “the lens group has positive refractive power” mean that the lens group as a whole has positive refractive power.
  • a lens group having negative refractive power and “the lens group has negative refractive power” mean that the lens group as a whole has negative refractive power.
  • the "first lens group,” “lens group,” “final lens group,” “focusing group,” and “anti-vibration group” are not limited to configurations consisting of multiple lenses, and may be configurations consisting of only one lens.
  • Single lens means a single lens that is not cemented.
  • a compound aspherical lens a lens in which a lens (e.g. a spherical lens) and an aspherical film formed on the lens are integrally constructed and function as a single aspherical lens as a whole
  • the radius of curvature, sign of refractive power, and surface shape of lenses that include aspherical surfaces are those in the paraxial region. The sign of the paraxial radius of curvature is positive for a surface with a convex shape facing the object side, and negative for a surface with a convex shape facing the image side.
  • total system refers to a variable magnification optical system.
  • Back focus in air-equivalent distance of the total system is the air-equivalent distance on the optical axis from the lens surface closest to the image side of the total system to the image plane.
  • the "focal length” used in the conditional formula is the paraxial focal length.
  • the “distance on the optical axis” used in the conditional formula is a geometric distance unless otherwise specified.
  • the values used in the conditional formula are values based on the d-line when focused on an object at infinity, unless otherwise specified.
  • the present disclosure makes it possible to provide a variable magnification optical system that is compact and maintains good optical performance over the entire range of magnification, and an imaging device that includes this variable magnification optical system.
  • 1A and 1B correspond to the variable magnification optical system of Example 1, and are diagrams showing a cross-sectional view of the configuration of a variable magnification optical system according to one embodiment and a movement locus.
  • FIG. 13 is a diagram for explaining symbols in a conditional expression.
  • 4A to 4C are diagrams showing various aberrations of the variable magnification optical system of Example 1.
  • 11A and 11B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a second embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 2.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a third embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system according to Example 3.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a fourth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 4.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a fifth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to the fifth embodiment.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a sixth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 6.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a seventh embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 7.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to an eighth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 8.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a ninth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 9.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a tenth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system of Example 10.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to an eleventh embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system of Example 11.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twelfth embodiment of the present invention.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 12.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a thirteenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 13.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a fourteenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 14.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a fifteenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 15.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a sixteenth embodiment of the present invention.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 16.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a seventeenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 17.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the eighteenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 18.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a nineteenth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 19.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twentieth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system according to Example 20.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-first embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 21.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-second embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 22.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-third embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 23.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-fourth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 24.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-fifth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 25.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 26.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 26.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a twenty-seventh embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 27.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the twenty-eighth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 28.
  • 23A and 23B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the twenty-ninth embodiment.
  • 23A to 23C are diagrams showing various aberrations in the variable magnification optical system of Example 29.
  • 30A and 30B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the 30th embodiment.
  • 30A to 30C are diagrams showing various aberrations in the variable magnification optical system according to Example 30.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a thirty-first embodiment.
  • 33A to 33C are diagrams showing various aberrations in the variable magnification optical system of Example 31.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 32.
  • 33A to 33C are diagrams showing various aberrations in the variable magnification optical system of Example 32.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the thirty-third embodiment.
  • 33A to 33C are diagrams showing various aberrations of the variable magnification optical system of Example 33.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 34.
  • 33A to 33C are diagrams showing various aberrations in the variable magnification optical system of Example 34.
  • 35A and 35B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the thirty-fifth embodiment.
  • 35A to 35C are diagrams showing various aberrations of the variable magnification optical system of Example 35.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 36.
  • 33A to 33C are diagrams showing various aberrations in the variable magnification optical system of Example 36.
  • 33A and 33B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 37.
  • 33A to 33C are diagrams showing various aberrations in the variable magnification optical system of Example 37.
  • 38 is a diagram showing a cross-sectional view of the configuration of a variable magnification optical system according to Example 38 and a movement locus thereof.
  • 36A to 36C are diagrams showing various aberrations in the variable magnification optical system of Example 38.
  • 39A and 39B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the thirty-ninth embodiment.
  • 36A to 36C are diagrams showing various aberrations in the variable magnification optical system of Example 39.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the fortieth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system according to Example 40.
  • 41A and 41B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the forty-first embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 41.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the forty-second embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 42.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of a variable magnification optical system according to a forty-third embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 43.
  • 41A and 41B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the forty-fourth embodiment.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 44.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system according to the forty-fifth embodiment.
  • 13A to 13C are diagrams showing various aberrations in the variable magnification optical system of Example 45.
  • 13A and 13B are diagrams showing a cross-sectional view and a movement locus of the variable magnification optical system of Example 46.
  • 11A to 11C are diagrams showing various aberrations in the variable magnification optical system of Example 46.
  • 1 is a perspective view of the front side of an imaging device according to an embodiment.
  • FIG. 2 is a perspective view of the rear side of the imaging device according to the embodiment.
  • FIG. 1 shows a cross-sectional view and a movement trajectory of the configuration of a variable magnification optical system according to one embodiment of the present disclosure.
  • the upper row labeled "Wide” shows the wide-angle end state
  • the lower row labeled “Tele” shows the telephoto end state.
  • the example shown in FIG. 1 corresponds to the variable magnification optical system of Example 1 described below.
  • FIG. 1 shows a state in which the lens is focused on an object at infinity, with the left side being the object side and the right side being the image side.
  • FIG. 1 also shows the axial light beam and the light beam with the maximum half angle of view ⁇ w at the wide-angle end, as well as the axial light beam and the light beam with the maximum half angle of view ⁇ t at the telephoto end.
  • variable magnification optical system comprises, in order from the object side to the image side along the optical axis Z, a first lens group G1 having negative refractive power, an intermediate group GM consisting of multiple lens groups, and a final lens group GE having refractive power.
  • a lens group is defined as a group whose spacing in the optical axis direction between adjacent groups changes when the magnification is changed. When the magnification is changed, the spacing between adjacent lenses within a lens group does not change.
  • a "lens group” is a component of a variable magnification optical system, and is a portion that includes at least one lens separated by an air gap that changes when the magnification is changed. When the magnification is changed, each lens group is moved or fixed in units.
  • a “lens group” may also include components other than lenses that do not have refractive power, such as an aperture diaphragm St.
  • each group of the variable magnification optical system shown in FIG. 1 is configured as follows:
  • the first lens group G1 consists of three lenses.
  • the intermediate group GM consists, in order from the object side to the image side, of a first intermediate lens group GM1 and a second intermediate lens group GM2.
  • the first intermediate lens group GM1 consists, in order from the object side to the image side, of one lens, an aperture stop St, and two lenses.
  • the second intermediate lens group GM2 consists of one lens.
  • the final lens group GE consists of one lens.
  • the first lens group G1, the first intermediate lens group GM1, and the second intermediate lens group GM2 move along the optical axis Z while changing the spacing between the adjacent lens groups, and the final lens group GE is fixed with respect to the image plane Sim.
  • the solid arrows show the approximate movement trajectory of each group that moves when changing magnification from the wide-angle end to the telephoto end.
  • the first lens group G1 may be configured to consist of three single lenses that are not cemented together. In this case, it is possible to suppress various aberrations while preventing the first lens group G1 from becoming large.
  • the lens group located closest to the object side of the intermediate group GM has positive refractive power. This is advantageous for size reduction.
  • the lens group located closest to the image side of the intermediate group GM has negative refractive power. This is advantageous for achieving a large image circle.
  • the final lens group GE may be configured to be fixed relative to the image plane Sim during magnification change.
  • the magnification change mechanism can be simplified.
  • the final lens group GE may be configured to consist of one positive lens. This is advantageous for shortening the overall length of the optical system.
  • the variable magnification optical system of the present disclosure includes a focusing group that moves along the optical axis Z during focusing. Focusing is achieved by the movement of the focusing group.
  • the focusing group is positioned closer to the image side than the first lens group G1. Such an arrangement is advantageous for making the diameter of the focusing group smaller.
  • the lens group located closest to the image side of the intermediate group GM may be configured to include the focusing group.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the parentheses and right-pointing arrow next to the second intermediate lens group GM2 in FIG. 1 indicate that the second intermediate lens group GM2 is the focusing group, and that it moves toward the image side when focusing from an object at infinity to the closest object.
  • the focusing group may be configured to consist of a single lens. This is advantageous for speeding up focusing.
  • the intermediate group GM includes an anti-vibration group that moves in a direction intersecting the optical axis Z during image blur correction.
  • Image blur correction is performed by the movement of the anti-vibration group.
  • the vibration-reduction group may be configured to be positioned closest to the object within the lens group that is positioned closest to the object side of the intermediate group GM. In this way, by moving only a part of the intermediate group rather than the entire group during image blur correction, the mechanism for image blur correction can be simplified. Also, by positioning the vibration-reduction group as described above, it becomes easier to suppress fluctuations in spherical aberration during image blur correction at the telephoto end.
  • the vibration-reduction group consists of a single lens in the first intermediate lens group GM1 that is closest to the object.
  • the parentheses and up and down arrows attached to the lens in the first intermediate lens group GM1 that is closest to the object in Figure 1 indicate that this lens is the vibration-reduction group.
  • variable magnification optical system of the present disclosure includes an anti-vibration group and a focusing group
  • the focusing group be positioned on the image side of the anti-vibration group.
  • the mechanism for image blur correction and the mechanism for focusing so that they do not interfere with each other, if the anti-vibration group is located on the image side of the focusing group, the amount of movement of the focusing group when focusing will be limited. Therefore, by positioning the focusing group on the image side of the anti-vibration group, it becomes easier to ensure space for the focusing group to move when focusing.
  • variable magnification optical system of the present disclosure preferably includes seven or more and eleven or less lenses. Having the variable magnification optical system include seven or more lenses is advantageous for suppressing various aberrations, and having eleven or less lenses is advantageous for shortening the overall length of the optical system. When the variable magnification optical system includes seven or more and nine or less lenses, it is possible to further shorten the overall length of the optical system while suppressing various aberrations.
  • variable magnification optical system of the present disclosure In order to avoid redundant explanations, the same symbols are used for elements with the same definitions and some of the duplicated explanations of the symbols will be omitted.
  • variable magnification optical system of the present disclosure in order to avoid redundant explanations, the "variable magnification optical system of the present disclosure" will also be simply referred to as the "variable magnification optical system.”
  • variable magnification optical system satisfies the following conditional expression (1).
  • TLw is the sum of the distance on the optical axis from the lens surface closest to the object of the first lens group G1 to the lens surface closest to the image of the final lens group GE when the lens is focused on an object at infinity at the wide-angle end, and the back focus in the air equivalent distance of the entire system.
  • fw is the focal length of the entire system when the lens is focused on an object at infinity at the wide-angle end.
  • ⁇ w is the maximum half angle of view when the lens is focused on an object at infinity at the wide-angle end.
  • TLw is the total length when the lens is focused on an object at infinity at the wide-angle end.
  • conditional expression (1) is the tangent, and this notation is the same for other conditional expressions.
  • the corresponding value of conditional expression (1) is not equal to or less than the lower limit, it is advantageous to suppress various aberrations, particularly at the wide-angle end.
  • the corresponding value of conditional expression (1) is not equal to or more than the upper limit, it is advantageous to reduce the size of the entire optical system. 2 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 6.5 (1)
  • variable magnification optical system it is preferable to replace the lower limit of 2 in conditional expression (1) with any of 2.3, 2.6, 2.8, 2.9, 3, 3.1, and 3.2. Also, it is preferable to replace the upper limit of 6.5 in conditional expression (1) with any of 6, 5.5, 5, 4.8, 4.6, 4.5, and 4.25.
  • variable magnification optical system it is more preferable for the variable magnification optical system to satisfy the following conditional expression (1-1), it is even more preferable for the variable magnification optical system to satisfy the following conditional expression (1-2), it is even more preferable for the variable magnification optical system to satisfy the following conditional expression (1-3), and it is even more preferable for the variable magnification optical system to satisfy the following conditional expression (1-4).
  • Figure 2 shows a cross-sectional view of the variable magnification optical system of Figure 1, and shows the above-mentioned total length TLw of this variable magnification optical system as an example.
  • the upper row labeled “Wide” shows the wide-angle end state
  • the lower row labeled “Tele” shows the telephoto end state.
  • variable magnification optical system satisfies the following conditional expression (2).
  • the back focus in the air equivalent distance of the entire system when focused on an object at infinity at the wide-angle end is defined as Bfw.
  • the above-mentioned back focus Bfw is shown in FIG. 2.
  • conditional expression (2) In order to obtain better characteristics, it is preferable to replace the lower limit of conditional expression (2) from 0.15 with any of 0.2, 0.25, 0.26, 0.3, 0.34, 0.35, 0.37, 0.4, 0.42, 0.43, and 0.45. It is also preferable to replace the upper limit of conditional expression (2) from 1.5 with any of 1.25, 1.1, 1.05, 1, 0.95, 0.9, 0.85, 0.83, and 0.82.
  • the variable magnification optical system satisfies the following conditional expression (3).
  • the sum of the thicknesses on the optical axis of all the lens groups is Dsum.
  • Dsum is the sum of the thicknesses on the optical axis of each lens group for all the lens groups in the entire system.
  • the "thickness on the optical axis of the lens group” refers to the distance on the optical axis from the surface closest to the object side of the lens group to the surface closest to the image side of the lens group.
  • variable magnification optical system In order to obtain better characteristics, it is preferable to replace the lower limit of 0.1 in condition (3) with any of 0.15, 0.2, 0.21, 0.22, and 0.23. It is also preferable to replace the upper limit of 0.8 in condition (3) with any of 0.6, 0.56, 0.54, 0.52, and 0.5.
  • condition (3-1) it is more preferable for the variable magnification optical system to satisfy the following condition (3-1)
  • variable magnification optical system satisfies the following conditional expression (4).
  • FNow is the maximum open F-number when focused on an object at infinity at the wide-angle end.
  • variable magnification optical system satisfies the following condition (4-1). 2.9 ⁇ FNow/tan ⁇ w ⁇ 6 (4-1)
  • variable magnification optical system satisfies the following conditional expression (5).
  • ft is the focal length of the entire system when focused on an object at infinity at the telephoto end.
  • variable magnification optical system it is preferable to replace the lower limit of 0.45 in condition (5) with any of 0.58, 0.63, 0.66, 0.69, 0.71, 0.73, and 0.75. It is also preferable to replace the upper limit of 3 in condition (5) with any of 2.2, 1.85, 1.7, 1.55, 1.45, 1.4, and 1.35.
  • variable magnification optical system it is more preferable for the variable magnification optical system to satisfy the following condition (5-1), it is even more preferable for the variable magnification optical system to satisfy the following condition (5-2), and it is even more preferable for the variable magnification optical system to satisfy the following condition (5-3).
  • variable magnification optical system satisfies the following conditional expression (6).
  • the focal length of the first lens group G1 is f1.
  • the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing aberration fluctuations during magnification.
  • the refractive power of the first lens group G1 does not become too weak, which makes it possible to suppress the amount of movement of the first lens group G1 during magnification.
  • the variable magnification optical system satisfies the following conditional expression (7).
  • the focal length of the anti-vibration group is posted.
  • the corresponding value of conditional expression (7) not equal to or less than the lower limit, the amount of movement of the anti-vibration group during image blur correction can be suppressed, which is advantageous for miniaturizing the entire variable magnification optical system and the anti-vibration unit.
  • the refractive power of the anti-vibration group does not become too strong, which is advantageous for suppressing aberration fluctuations during image blur correction.
  • variable magnification optical system satisfies the following conditional expression (8).
  • conditional expression (8) By making the corresponding value of conditional expression (8) not equal to or less than the lower limit, the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing aberration fluctuations during magnification.
  • conditional expression (8) By making the corresponding value of conditional expression (8) not equal to or more than the upper limit, the refractive power of the first lens group G1 does not become too weak, which makes it possible to suppress the amount of movement of the first lens group G1 during magnification. -3.5 ⁇ fw/f1 ⁇ -0.2 (8)
  • variable magnification optical system satisfies the following conditional expression (9).
  • the focal length of the middle group GM when focused on an object at infinity at the wide-angle end is fMw.
  • the positive refractive power of the middle group GM does not become too weak, so that the amount of movement of the middle group GM during variable magnification can be suppressed.
  • the positive refractive power of the middle group GM does not become too strong, which is advantageous for correcting spherical aberration at the telephoto end.
  • variable magnification optical system satisfies the following conditional expression (10).
  • the focal length of the lens group located closest to the image side of the middle group GM is fme.
  • the refractive power of the lens group located closest to the image side of the middle group GM does not become too strong, which is advantageous for suppressing aberration fluctuations during magnification.
  • the refractive power of the lens group located closest to the image side of the middle group GM does not become too weak, which can suppress the movement amount of the lens group located closest to the image side of the middle group GM during magnification.
  • the lower limit of condition (10) from -16 with any of -15, -14, -13, -12, -11, -10, -5, -4, and -3. It is also preferable to replace the upper limit of condition (10) from -0.15 with any of -0.3, -0.4, -0.8, -1.2, -1.4, -1.5, -1.6, -1.7, and -1.8.
  • the variable magnification optical system satisfies the following condition (10-1). -10 ⁇ ft/fme ⁇ -1.5 (10-1)
  • variable magnification optical system satisfies the following conditional expression (11).
  • the focal length of the final lens group GE is fE.
  • the negative refractive power of the final lens group GE does not become too strong, which is advantageous for reducing the angle of incidence of the off-axis chief ray on the image surface Sim.
  • the positive refractive power of the final lens group GE does not become too strong, which is advantageous for correcting the field curvature.
  • the variable magnification optical system may be configured to satisfy the following conditional expression (11-1).
  • conditional expression (11-1) By making sure that the corresponding value of conditional expression (11-1) is not equal to or less than the lower limit, the positive refractive power of the final lens group GE does not become too weak, which is advantageous for reducing the angle of incidence of the off-axis chief ray on the image surface Sim.
  • conditional expression (11-1) By making sure that the corresponding value of conditional expression (11-1) is not equal to or more than the upper limit, the positive refractive power of the final lens group GE does not become too strong, which is advantageous for correcting the curvature of field.
  • conditional expression (11-1) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (11-1) from 0.1 to 0.11. It is also preferable to change the upper limit of conditional expression (11-1) from 0.7 to 0.68.
  • variable magnification optical system satisfies the following conditional expression (12).
  • the focal length of the lens group located closest to the object side of the middle group GM is fm1.
  • the corresponding value of conditional expression (12) is not equal to or less than the lower limit, it is advantageous for correcting spherical aberration on the telephoto side.
  • the refractive power of the first lens group G1 does not become too strong, and the refractive power of the lens group located closest to the object side of the middle group GM does not become too weak, which is advantageous for correcting spherical aberration on the wide-angle side.
  • conditional expression (12) it is possible to achieve a high variable magnification ratio without increasing the amount of movement of the lens group located closest to the object side of the middle group GM during variable magnification, which is advantageous for shortening the overall length of the optical system.
  • variable magnification optical system satisfies the following conditional expression (13).
  • conditional expression (13) By making the corresponding value of conditional expression (13) not equal to or less than the lower limit, the negative refractive power of the lens group located closest to the image side of the middle group GM relative to the lens group located closest to the object side of the middle group GM does not become too strong, which is advantageous for correction of spherical aberration, particularly at the telephoto end.
  • conditional expression (13) By making the corresponding value of conditional expression (13) not equal to or more than the upper limit, the negative refractive power of the lens group located closest to the image side of the middle group GM relative to the lens group located closest to the object side of the middle group GM does not become too weak, which can prevent overcorrection of spherical aberration, particularly at the telephoto end. -15 ⁇ fm1/fme ⁇ -0.05 (13)
  • variable magnification optical system satisfies the following conditional expression (14).
  • FNot is the maximum F-number when focused on an object at infinity at the telephoto end.
  • variable magnification optical system satisfies the following conditional expression (15).
  • the maximum half angle of view when focused on an object at infinity at the telephoto end is set to ⁇ t.
  • the corresponding value of conditional expression (15) is not equal to or lower than the lower limit, it is advantageous for suppressing various aberrations.
  • the corresponding value of conditional expression (15) is not equal to or higher than the upper limit, it is advantageous for achieving a wide angle of view at the wide-angle end. 0.4 ⁇ fw/(ft ⁇ tan ⁇ t) ⁇ 2.7 (15)
  • variable magnification optical system satisfies the following conditional expression (16).
  • conditional expression (16) By making sure that the corresponding value of conditional expression (16) is not below the lower limit, the positive refractive power of the final lens group GE does not become too strong, which is advantageous for correcting curvature of field, particularly at the wide-angle end.
  • the negative refractive power of the lens group located closest to the image side of the intermediate group GM does not become too strong, which is advantageous for correcting astigmatism, particularly at the wide-angle end. -9 ⁇ fme/fE ⁇ -0.05 (16)
  • variable magnification optical system satisfies the following conditional expression (17).
  • conditional expression (17) By making sure that the corresponding value of conditional expression (17) is not equal to or less than the lower limit, the refractive power of the middle group GM including the lens group that moves during magnification variation will not become too weak, which is advantageous for suppressing the amount of movement of the first lens group G1 during magnification variation.
  • the corresponding value of conditional expression (17) is not equal to or more than the upper limit, the refractive power of the first lens group G1 will not become too weak, which is advantageous for suppressing distortion at the wide-angle end.
  • variable magnification optical system satisfies the following conditional expression (18).
  • conditional expression (18) By making sure that the corresponding value of conditional expression (18) is not equal to or less than the lower limit, the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing aberration fluctuations during magnification.
  • the refractive power of the first lens group G1 does not become too weak, which is advantageous for suppressing distortion at the wide-angle end.
  • variable magnification optical system satisfies the following conditional expression (19).
  • conditional expression (19) By making sure that the corresponding value of conditional expression (19) is not below the lower limit, the refractive power of the middle group GM does not become too strong, so that the curvature of field generated in the middle group GM can be reduced, which is advantageous for correcting aberrations when varying magnification.
  • the refractive power of the middle group GM By making sure that the corresponding value of conditional expression (19) is not above the upper limit, the refractive power of the middle group GM does not become too weak, so that the amount of movement of the middle group GM when varying magnification can be suppressed, which is advantageous for shortening the overall length of the optical system. 0.15 ⁇ fMw/(fw ⁇ ft) 1/2 ⁇ 2 (19)
  • variable magnification optical system satisfies the following conditional expression (20).
  • conditional expression (20) By making sure that the corresponding value of conditional expression (20) is not equal to or less than the lower limit, it is advantageous for improving performance.
  • the corresponding value of conditional expression (20) is not equal to or greater than the upper limit, it is advantageous for suppressing distortion at the wide-angle end, since the refractive power of the first lens group G1 does not become too weak.
  • variable magnification optical system satisfies the following conditional expression (21).
  • conditional expression (21) By making sure that the corresponding value of conditional expression (21) is not equal to or less than the lower limit, it is advantageous for suppressing various aberrations at the wide-angle end.
  • conditional expression (21) By making sure that the corresponding value of conditional expression (21) is not equal to or greater than the upper limit, it is advantageous for shortening the overall length of the optical system at the wide-angle end. 2.5 ⁇ TLw/fw ⁇ 7 (21)
  • variable magnification optical system satisfies the following conditional expression (22).
  • the focal length of the focusing group is ffoc.
  • the refractive power of the focusing group does not become too weak, and the amount of movement of the focusing group during focusing can be suppressed.
  • the refractive power of the focusing group does not become too strong, which is advantageous for suppressing aberration fluctuations during focusing.
  • variable magnification optical system satisfies the following conditional expression (23).
  • conditional expression (23) By making sure that the corresponding value of conditional expression (23) is not below the lower limit, the refractive power of the focusing group does not become too weak, and the amount of movement of the focusing group during focusing can be suppressed.
  • conditional expression (23) By making sure that the corresponding value of conditional expression (23) is not above the upper limit, the refractive power of the focusing group does not become too strong, which is advantageous for suppressing aberration fluctuations during focusing. 0.15 ⁇ fw/
  • the variable magnification optical system satisfies the following conditional expression (24).
  • the Abbe number based on the d-line of the lens constituting the focusing group is ⁇ dfoc.
  • variable magnification optical system satisfies the following conditional expression (25).
  • DDL1STw the distance on the optical axis from the surface closest to the object of the first lens group G1 to the aperture stop St in a state in which an object at infinity is focused at the wide-angle end.
  • DDL1STw the above distance DDL1STw is shown in FIG. 2.
  • the distance between the aperture stop St and the first lens group G1 is not too short, so that the distance from the lens surface closest to the object of the first lens group G1 to the entrance pupil position is not too short, which makes it easy to suppress aberration fluctuations during magnification.
  • the distance between the aperture stop St and the first lens group G1 is not too long, so that the distance from the lens surface closest to the object of the first lens group G1 to the entrance pupil position is not too long. This makes it possible to prevent the diameter of the first lens group G1 from becoming large, which is advantageous for miniaturization. 0.18 ⁇ DDL1STw/TLw ⁇ 0.8 (25)
  • variable magnification optical system satisfies the following conditional expression (26).
  • the distance on the optical axis between the first lens group G1 and the middle group GM in a state where the lens is focused on an object at infinity at the wide-angle end is DDG1Mw.
  • the distance on the optical axis between the first lens group G1 and the middle group GM in a state where the lens is focused on an object at infinity at the telephoto end is DDG1Mt.
  • FIG. 2 shows the distances DDG1Mw and DDG1Mt.
  • variable magnification optical system satisfies the following conditional expression (27).
  • the paraxial radius of curvature of the object side surface of the negative lens closest to the object among the negative lenses included in the first lens group G1 is R1nf.
  • the paraxial radius of curvature of the image side surface of the negative lens closest to the object among the negative lenses included in the first lens group G1 is R1nr.
  • conditional expression (27) is made not equal to or more than the upper limit, so that it becomes easy to achieve a wide angle of view at the wide angle end. 0.4 ⁇ (R1nf+R1nr)/(R1nf-R1nr) ⁇ 5 (27)
  • variable magnification optical system satisfies the following conditional expression (28).
  • conditional expression (28) the sum of the thicknesses on the optical axis of all the lenses in the first lens group G1 is defined as d1sum.
  • variable magnification optical system includes an aperture stop St
  • the variable magnification optical system satisfies the following conditional expression (29).
  • the composite focal length from the lens closest to the object in the first lens group G1 to the aperture stop St in a state in which the lens is focused on an object at infinity at the wide-angle end is fL1STw.
  • conditional expression (29) By making the corresponding value of conditional expression (29) not equal to or more than the upper limit, the positive refractive power of the partial optical system from the lens closest to the object in the first lens group G1 to the aperture stop St at the wide-angle end does not become too weak, which is advantageous for correcting spherical aberration at the wide-angle end.
  • variable magnification optical system includes an aperture stop St
  • the variable magnification optical system satisfies the following conditional expression (30).
  • conditional expression (30) By making the corresponding value of conditional expression (30) not equal to or less than the lower limit, the positive refractive power of the partial optical system from the lens closest to the object in the first lens group G1 at the wide-angle end to the aperture stop St does not become too weak, which is advantageous for correcting spherical aberration at the wide-angle end.
  • conditional expression (30) By making the corresponding value of conditional expression (30) not equal to or more than the upper limit, the positive refractive power of the partial optical system from the lens closest to the object in the first lens group G1 at the wide-angle end to the aperture stop St does not become too strong, which is advantageous for obtaining a wide angle of view at the wide-angle end. 0.1 ⁇ fw/fL1STw ⁇ 3.2 (30)
  • conditional expression (30) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (30) from 0.1 to either 0.2 or 0.3. It is also preferable to change the upper limit of conditional expression (30) from 3.2 to either 2.5 or 2.
  • variable magnification optical system satisfies the following conditional expression (31).
  • the refractive index of the negative lens closest to the object among the negative lenses included in the first lens group G1 with respect to the d-line is N1n.
  • conditional expression (31) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (31) from 1.55 to either 1.58 or 1.6. It is also preferable to change the upper limit of conditional expression (31) from 2 to either 1.93 or 1.88.
  • variable magnification optical system satisfies the following conditional expression (32).
  • conditional expression (32) By making the corresponding value of conditional expression (32) not equal to or less than the lower limit, the thickness of each lens group does not become too small, so that it is easy to achieve a wide angle of view and it is possible to suppress aberration fluctuations during magnification.
  • conditional expression (32) By making the corresponding value of conditional expression (32) not equal to or greater than the upper limit, the thickness of the variable magnification optical system does not become too large, which is advantageous for shortening the overall lens length when collapsed in particular.
  • conditional expression (32) it is possible to sufficiently correct aberrations while reducing the thickness of each lens group and, particularly when the variable magnification optical system is collapsed, achieving a reduction in the overall lens length when collapsed. 1 ⁇ (Dsum/TLw) ⁇ FNow ⁇ 2.5 (32)
  • the lower limit of condition (32) In order to obtain better characteristics, it is preferable to change the lower limit of condition (32) from 1 to either 1.2 or 1.3. It is also preferable to change the upper limit of condition (32) from 2.5 to 2.3.
  • the variable magnification optical system satisfies the following conditional expression (33).
  • the thickness of the focusing group on the optical axis is Dfoc.
  • the "thickness of the focusing group on the optical axis" is the distance on the optical axis from the surface of the focusing group closest to the object side to the surface of the focusing group closest to the image side.
  • the thickness Dfoc is shown in FIG. 2.
  • variable magnification optical system satisfies the following conditional expression (34).
  • conditional expression (34) By making sure that the corresponding value of conditional expression (34) is not equal to or less than the lower limit, it is advantageous for ensuring the strength of the first lens group G1.
  • conditional expression (34) By making sure that the corresponding value of conditional expression (34) is not equal to or greater than the upper limit, it is advantageous for reducing the weight of the first lens group G1. 0.045 ⁇ d1sum/
  • the first lens group G1 may be configured to consist of two lenses. This is advantageous for shortening the overall length of the optical system.
  • the first lens group G1 may be configured to consist of four lenses. This is advantageous for suppressing various aberrations.
  • the focusing group may be configured to consist of two lenses. This is advantageous in suppressing aberration fluctuations during focusing.
  • the variable magnification optical system satisfies the following conditional expression (1-2).
  • conditional expression (1-2) By ensuring that the corresponding value of conditional expression (1-2) is not equal to or lower than the lower limit, it is advantageous for suppressing various aberrations, particularly at the wide-angle end.
  • conditional expression (1-2) By ensuring that the corresponding value of conditional expression (1-2) is not equal to or higher than the upper limit, it is advantageous for miniaturization of the entire optical system. 2.8 ⁇ TLw/(fw ⁇ tan ⁇ w) ⁇ 5 (1-2)
  • conditional expression (1-2) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (1-2) from 2.8 to any of 2.9, 3, 3.1, and 3.2. It is also preferable to change the upper limit of conditional expression (1-2) from 5 to any of 4.8, 4.6, 4.5, and 4.25.
  • the variable magnification optical system satisfies the following conditional formula (2-1A).
  • conditional formula (2-1A) By ensuring that the corresponding value of conditional formula (2-1A) is not equal to or less than the lower limit, the back focus does not become too short, making it easy to attach a mount exchange mechanism.
  • the corresponding value of conditional formula (2-1A) is not equal to or more than the upper limit, the back focus does not become too long, making it easy to reduce the size. 0.18 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.25 (2-1A)
  • the variable magnification optical system satisfies the following conditional formula (5-1A).
  • conditional formula (5-1A) By ensuring that the corresponding value of conditional formula (5-1A) is not equal to or less than the lower limit, it is advantageous for suppressing various aberrations over the entire range of magnification.
  • conditional formula (5-1A) By ensuring that the corresponding value of conditional formula (5-1A) is not equal to or more than the upper limit, it is advantageous for reducing the size of the entire optical system, or for obtaining a sufficient variable magnification ratio as a variable magnification optical system. 0.63 ⁇ (fw ⁇ TLw)/ ft2 ⁇ 1.85 (5-1A)
  • the variable magnification optical system satisfies the following conditional expression (6-1).
  • conditional expression (6-1) By making sure that the corresponding value of conditional expression (6-1) is not equal to or less than the lower limit, the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing aberration fluctuations during magnification.
  • the refractive power of the first lens group G1 does not become too weak, which makes it possible to suppress the amount of movement of the first lens group G1 during magnification.
  • conditional expression (6-1) In order to obtain better characteristics, it is preferable to change the lower limit of conditional expression (6-1) from -7 to any of -6, -5, -4, and -3. It is also preferable to change the upper limit of conditional expression (6-1) from -0.9 to any of -1, -1.1, -1.2, and -1.3.
  • the variable magnification optical system satisfies the above-mentioned conditional expressions (1-2), (2-1A), (5-1A), and (6-1).
  • the final lens group GE may be configured to move along the optical axis Z when changing the magnification. This is advantageous in suppressing aberration fluctuations when changing the magnification.
  • FIG. 1 shows an example in which the variable magnification optical system is a zoom lens, but the variable magnification optical system of the present disclosure may be a zoom lens or a varifocal lens.
  • variable magnification optical system of the present disclosure comprises, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM consisting of multiple lens groups, and a final lens group GE having refractive power, and when varying the magnification, the distance between the first lens group G1 and the intermediate group GM changes, the distance between the intermediate group GM and the final lens group GE changes, and all distances between adjacent lens groups in the intermediate group GM change, and a focusing group that moves along the optical axis Z during focusing is positioned closer to the image side than the first lens group G1, and satisfies the above conditional expressions (1), (2), and (3).
  • variable magnification optical system of the present disclosure will be described with reference to the drawings.
  • the reference symbols given to each group in the cross-sectional views of each example are used independently for each example to avoid cluttering the explanations and drawings that would otherwise be accompanied by an increase in the number of digits in the reference symbols. Therefore, even if common reference symbols are used in drawings of different examples, this does not necessarily mean that the configuration is the same.
  • Example 1 The configuration and movement locus of the variable magnification optical system of Example 1 are shown in Figure 1, and the method of illustration and the configuration are as described above, so some overlapping explanations will be omitted here.
  • the variable magnification optical system of Example 1 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the aperture stop St is disposed in the first intermediate lens group GM1.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 1 the basic lens data is shown in Table 1, the specifications and variable surface spacing in Table 2, and the aspheric coefficients in Table 3.
  • the basic lens data table is written as follows.
  • the Sn column shows the surface numbers when the surface closest to the object is designated as the first surface and the numbers increase by one toward the image side.
  • the R column shows the radius of curvature of each surface.
  • the D column shows the surface spacing on the optical axis between each surface and its adjacent surface on the image side.
  • the Nd column shows the refractive index for the d-line of each component.
  • the ⁇ d column shows the Abbe number of each component based on the d-line.
  • the ⁇ gF column shows the partial dispersion ratio between the g-line and F-line of each component. "Gois” is written in the leftmost column of the row of the lens corresponding to the vibration reduction group, and "Gfoc" is written in the leftmost column of the row of the lens corresponding to the focusing group.
  • ⁇ gF (Ng-NF)/(NF-NC)
  • the "d-line,” “C-line,” “F-line,” and “g-line” mentioned in this specification are emission lines, and the wavelength of the d-line is treated as 587.56 nm (nanometers), the wavelength of the C-line as 656.27 nm (nanometers), the wavelength of the F-line as 486.13 nm (nanometers), and the wavelength of the g-line as 435.84 nm (nanometers).
  • the sign of the radius of curvature of a surface with a convex shape facing the object side is positive, and the sign of the radius of curvature of a surface with a convex shape facing the image side is negative.
  • the surface number and the term (St) are entered in the column of the surface number of the surface corresponding to the aperture stop St.
  • the value in the bottom row of the D column in the table is the distance between the surface closest to the image side in the table and the image plane Sim.
  • the symbol DD[ ] is used for the variable surface distance during magnification, and the surface number of this distance on the object side is entered in the [ ] in the surface distance column.
  • Table 2 shows the zoom ratio Zr, focal length f, back focus Bf, maximum open F-number FNo., maximum full angle of view 2 ⁇ , and variable surface spacing based on the d-line.
  • the zoom ratio is synonymous with the zoom magnification.
  • [°] indicates that the unit is degrees.
  • the columns labeled "Wide,” “Middle,” and “Tele” show the values for the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • the surface numbers of the aspheric surfaces are marked with *, and the value of the paraxial radius of curvature is written in the column of the radius of curvature of the aspheric surface.
  • Table 3 the row Sn shows the surface numbers of the aspheric surfaces, and the rows KA and Am show the numerical values of the aspheric coefficients for each aspheric surface.
  • KA and Am are aspheric coefficients in the aspheric formula expressed by the following formula.
  • Zd C ⁇ h2 / ⁇ 1+(1-KA ⁇ C2 ⁇ h2 ) 1/2 ⁇ + ⁇ Am ⁇ h m however,
  • h Height (distance from optical axis Z to lens surface)
  • C reciprocal of paraxial radius of curvature KA
  • Am aspheric coefficients, and ⁇ in the aspheric formula represents the summation with respect to m.
  • FIG. 3 shows each aberration diagram of the variable magnification optical system of Example 1 in a state where the optical system is focused on an object at infinity.
  • FIG. 3 from the left, spherical aberration, astigmatism, distortion, and lateral chromatic aberration are shown.
  • the upper row labeled "Wide” shows the aberration in the wide-angle end state
  • the middle row labeled "Middle” shows the aberration in the intermediate focal length state
  • the lower row labeled "Tele” shows the aberration in the telephoto end state.
  • the aberrations at the d-line, C-line, and F-line are shown by solid lines, long dashed lines, and short dashed lines, respectively.
  • the aberration at the d-line in the sagittal direction is shown by solid lines
  • the aberration at the d-line in the tangential direction is shown by short dashed lines.
  • the aberration at the d-line is shown by solid lines.
  • the aberrations at the C-line and F-line are shown by long dashed lines and short dashed lines, respectively.
  • Example 2 The configuration and movement locus of the variable magnification optical system of Example 2 are shown in Figure 4.
  • the variable magnification optical system of Example 2 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 2 the basic lens data is shown in Table 4, the specifications and variable surface spacing in Table 5, the aspheric coefficients in Table 6, and the various aberration diagrams in Figure 5.
  • Example 3 The configuration and movement locus of the variable magnification optical system of Example 3 are shown in Figure 6.
  • the variable magnification optical system of Example 3 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the lens closest to the object side of the first lens group G1 is a composite aspheric lens.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 3 the basic lens data is shown in Table 7, the specifications and variable surface spacing in Table 8, the aspheric coefficients in Table 9, and the various aberration diagrams in Figure 7.
  • Example 4 The configuration and movement locus of the variable magnification optical system of Example 4 are shown in Figure 8.
  • the variable magnification optical system of Example 4 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 4 the basic lens data is shown in Table 10, the specifications and variable surface spacing in Table 11, the aspheric coefficients in Table 12, and the various aberration diagrams in Figure 9.
  • Example 5 The configuration and movement locus of the variable magnification optical system of Example 5 are shown in Figure 10.
  • the variable magnification optical system of Example 5 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 5 the basic lens data is shown in Table 13, the specifications and variable surface spacing in Table 14, the aspheric coefficients in Table 15, and the various aberration diagrams in Figure 11.
  • Example 6 The configuration and movement locus of the variable magnification optical system of Example 6 are shown in Figure 12.
  • the variable magnification optical system of Example 6 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the lens closest to the object side of the first lens group G1 is a composite aspheric lens.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 6 the basic lens data is shown in Table 16, the specifications and variable surface spacing in Table 17, the aspheric coefficients in Table 18, and the various aberration diagrams in Figure 13.
  • Example 7 The configuration and movement locus of the variable magnification optical system of Example 7 are shown in Figure 14.
  • the variable magnification optical system of Example 7 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • Example 8 The configuration and movement locus of the variable magnification optical system of Example 8 are shown in Figure 16.
  • the variable magnification optical system of Example 8 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 8 the basic lens data is shown in Table 22, the specifications and variable surface spacing in Table 23, the aspheric coefficients in Table 24, and the various aberration diagrams in Figure 17.
  • Example 9 The configuration and movement locus of the variable magnification optical system of Example 9 are shown in Figure 18.
  • the variable magnification optical system of Example 9 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 9 the basic lens data is shown in Table 25, the specifications and variable surface spacing in Table 26, the aspheric coefficients in Table 27, and the various aberration diagrams in Figure 19.
  • Example 10 The configuration and movement locus of the variable magnification optical system of Example 10 are shown in Figure 20.
  • the variable magnification optical system of Example 10 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 10 the basic lens data is shown in Table 28, the specifications and variable surface spacing in Table 29, the aspheric coefficients in Table 30, and the various aberration diagrams in Figure 21.
  • Example 11 The configuration and movement locus of the variable magnification optical system of Example 11 are shown in Figure 22.
  • the variable magnification optical system of Example 11 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 11 the basic lens data is shown in Table 31, the specifications and variable surface spacing in Table 32, the aspheric coefficients in Table 33, and the various aberration diagrams in Figure 23.
  • Example 12 The configuration and movement locus of the variable magnification optical system of Example 12 are shown in Figure 24.
  • the variable magnification optical system of Example 12 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 12 the basic lens data is shown in Table 34, the specifications and variable surface spacing in Table 35, the aspheric coefficients in Table 36, and the various aberration diagrams in Figure 25.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • Example 14 The configuration and movement locus of the variable magnification optical system of Example 14 are shown in Figure 28.
  • the variable magnification optical system of Example 14 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • variable magnification optical system of Example 14 the basic lens data is shown in Table 40, the specifications and variable surface spacing in Table 41, the aspheric coefficients in Table 42, and the various aberration diagrams in Figure 29.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 15 the basic lens data is shown in Table 43, the specifications and variable surface spacing in Table 44, the aspheric coefficients in Table 45, and each aberration diagram in Figure 31.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 16 the basic lens data is shown in Table 46, the specifications and variable surface spacing in Table 47, the aspheric coefficients in Table 48, and each aberration diagram in Figure 33.
  • Example 17 The configuration and movement locus of the variable magnification optical system of Example 17 are shown in Figure 34.
  • the variable magnification optical system of Example 17 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the lens closest to the object side of the first lens group G1 is a composite aspheric lens.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 17 the basic lens data is shown in Table 49, the specifications and variable surface spacing in Table 50, the aspheric coefficients in Table 51, and each aberration diagram in Figure 35.
  • Example 18 The configuration and movement locus of the variable magnification optical system of Example 18 are shown in Figure 36.
  • the variable magnification optical system of Example 18 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 18 the basic lens data is shown in Table 52, the specifications and variable surface spacing in Table 53, the aspheric coefficients in Table 54, and the various aberration diagrams in Figure 37.
  • Example 19 The configuration and movement locus of the variable magnification optical system of Example 19 are shown in Figure 38.
  • the variable magnification optical system of Example 19 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • Example 20 The configuration and movement locus of the variable magnification optical system of Example 20 are shown in Figure 40.
  • the variable magnification optical system of Example 20 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the single lens of the second intermediate lens group GM2 that is closest to the image side.
  • variable magnification optical system of Example 20 the basic lens data is shown in Table 58, the specifications and variable surface spacing in Table 59, the aspheric coefficients in Table 60, and the various aberration diagrams in Figure 41.
  • Example 21 The configuration and movement locus of the variable magnification optical system of Example 21 are shown in Figure 42.
  • the variable magnification optical system of Example 21 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the lens closest to the object side of the first lens group G1 is a composite aspheric lens.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 21 the basic lens data is shown in Table 61, the specifications and variable surface spacing in Table 62, the aspheric coefficients in Table 63, and each aberration diagram in Figure 43.
  • Example 22 The configuration and movement locus of the variable magnification optical system of Example 22 are shown in Figure 44.
  • the variable magnification optical system of Example 22 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 22 the basic lens data is shown in Table 64, the specifications and variable surface spacing in Table 65, the aspheric coefficients in Table 66, and each aberration diagram in Figure 45.
  • Example 23 The configuration and movement locus of the variable magnification optical system of Example 23 are shown in Figure 46.
  • the variable magnification optical system of Example 23 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the lens closest to the object side of the first lens group G1 is a composite aspheric lens.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 23 the basic lens data is shown in Table 67, the specifications and variable surface spacing in Table 68, the aspheric coefficients in Table 69, and each aberration diagram in Figure 47.
  • Example 24 The configuration and movement locus of the variable magnification optical system of Example 24 are shown in Figure 48.
  • the variable magnification optical system of Example 24 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 24 the basic lens data is shown in Table 70, the specifications and variable surface spacing in Table 71, the aspheric coefficients in Table 72, and each aberration diagram in Figure 49.
  • Example 25 The configuration and movement locus of the variable magnification optical system of Example 25 are shown in Figure 50.
  • the variable magnification optical system of Example 25 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 25 the basic lens data is shown in Table 73, the specifications and variable surface spacing in Table 74, the aspheric coefficients in Table 75, and each aberration diagram in Figure 51.
  • Example 26 The configuration and movement locus of the variable magnification optical system of Example 26 are shown in Figure 52.
  • the variable magnification optical system of Example 26 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 26 the basic lens data is shown in Table 76, the specifications and variable surface spacing in Table 77, the aspheric coefficients in Table 78, and the various aberration diagrams in Figure 53.
  • Example 27 The configuration and movement locus of the variable magnification optical system of Example 27 are shown in Figure 54.
  • the variable magnification optical system of Example 27 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 27 the basic lens data is shown in Table 79, the specifications and variable surface spacing in Table 80, the aspheric coefficients in Table 81, and each aberration diagram in Figure 55.
  • Example 28 The configuration and movement locus of the variable magnification optical system of Example 28 are shown in Figure 56.
  • the variable magnification optical system of Example 28 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group consists of the third intermediate lens group GM3.
  • the vibration reduction group consists of the first intermediate lens group GM1.
  • variable magnification optical system of Example 28 the basic lens data is shown in Table 82, the specifications and variable surface spacing in Table 83, the aspheric coefficients in Table 84, and the various aberration diagrams in Figure 57.
  • Example 29 The configuration and movement locus of the variable magnification optical system of Example 29 are shown in Figure 58.
  • the variable magnification optical system of Example 29 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 29 the basic lens data is shown in Table 85, the specifications and variable surface spacing in Table 86, the aspheric coefficients in Table 87, and each aberration diagram in Figure 59.
  • Example 30 The configuration and movement locus of the variable magnification optical system of Example 30 are shown in Figure 60.
  • the variable magnification optical system of Example 30 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 30 the basic lens data is shown in Table 88, the specifications and variable surface spacing in Table 89, the aspheric coefficients in Table 90, and each aberration diagram in Figure 61.
  • Example 31 The configuration and movement locus of the variable magnification optical system of Example 31 are shown in Figure 62.
  • the variable magnification optical system of Example 31 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 31 the basic lens data is shown in Table 91, the specifications and variable surface spacing in Table 92, the aspheric coefficients in Table 93, and each aberration diagram in Figure 63.
  • Example 32 The configuration and movement locus of the variable magnification optical system of Example 32 are shown in Figure 64.
  • the variable magnification optical system of Example 32 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 32 the basic lens data is shown in Table 94, the specifications and variable surface spacing in Table 95, the aspheric coefficients in Table 96, and each aberration diagram in Figure 65.
  • Example 33 The configuration and movement locus of the variable magnification optical system of Example 33 are shown in Figure 66.
  • the variable magnification optical system of Example 33 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 33 the basic lens data is shown in Table 97, the specifications and variable surface spacing in Table 98, the aspheric coefficients in Table 99, and each aberration diagram in Figure 67.
  • Example 34 The configuration and movement locus of the variable magnification optical system of Example 34 are shown in Figure 68.
  • the variable magnification optical system of Example 34 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 34 the basic lens data is shown in Table 100, the specifications and variable surface spacing in Table 101, the aspheric coefficients in Table 102, and each aberration diagram in Figure 69.
  • Example 35 The configuration and movement locus of the variable magnification optical system of Example 35 are shown in Figure 70.
  • the variable magnification optical system of Example 35 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image plane Sim, and the other lens groups move along the optical axis Z while changing the intervals between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 35 the basic lens data is shown in Table 103, the specifications and variable surface spacing in Table 104, the aspheric coefficients in Table 105, and each aberration diagram in Figure 71.
  • Example 36 The configuration and movement locus of the variable magnification optical system of Example 36 are shown in Figure 72.
  • the variable magnification optical system of Example 36 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image plane Sim, and the other lens groups move along the optical axis Z while changing the intervals between adjacent lens groups.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of the second intermediate lens group GM2.
  • variable magnification optical system of Example 36 the basic lens data is shown in Table 106, the specifications and variable surface spacing in Table 107, the aspheric coefficients in Table 108, and the various aberration diagrams in Figure 73.
  • Example 37 The configuration and movement locus of the variable magnification optical system of Example 37 are shown in Figure 74.
  • the variable magnification optical system of Example 37 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When varying the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image plane Sim, and the other lens groups move along the optical axis Z while changing the intervals between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of a single lens in the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 37 the basic lens data is shown in Table 109, the specifications and variable surface spacing in Table 110, the aspheric coefficients in Table 111, and each aberration diagram in Figure 75.
  • Example 38 The configuration and movement locus of the variable magnification optical system of Example 38 are shown in Figure 76.
  • the variable magnification optical system of Example 38 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, a third intermediate lens group GM3 having negative refractive power, and a fourth intermediate lens group GM4 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image surface Sim, The other lens groups change the distance between themselves and the adjacent lens groups and move along the optical axis Z.
  • the focusing group is made up of a fourth intermediate lens group GM4.
  • the vibration reduction group is made up of a second intermediate lens group GM2.
  • variable magnification optical system of Example 38 the basic lens data is shown in Table 112, the specifications and variable surface spacing in Table 113, the aspheric coefficients in Table 114, and the various aberration diagrams in Figure 77.
  • Example 39 The configuration and movement locus of the variable magnification optical system of Example 39 are shown in Figure 78.
  • the variable magnification optical system of Example 39 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When varying the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image plane Sim, and the other lens groups move along the optical axis Z while changing the intervals between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of a single lens in the first intermediate lens group GM1 that is closest to the object side.
  • Example 40 The configuration and movement locus of the variable magnification optical system of Example 40 are shown in Figure 80.
  • the variable magnification optical system of Example 40 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 40 the basic lens data is shown in Table 118, the specifications and variable surface spacing in Table 119, the aspheric coefficients in Table 120, and each aberration diagram in Figure 81.
  • Example 41 The configuration and movement locus of the variable magnification optical system of Example 41 are shown in Figure 82.
  • the variable magnification optical system of Example 41 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 41 the basic lens data is shown in Table 121, the specifications and variable surface spacing in Table 122, the aspheric coefficients in Table 123, and each aberration diagram in Figure 83.
  • Example 42 The configuration and movement locus of the variable magnification optical system of Example 42 are shown in Figure 84.
  • the variable magnification optical system of Example 42 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having negative refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 42 the basic lens data is shown in Table 124, the specifications and variable surface spacing in Table 125, the aspheric coefficients in Table 126, and each aberration diagram in Figure 85.
  • Example 43 The configuration and movement locus of the variable magnification optical system of Example 43 are shown in Figure 86.
  • the variable magnification optical system of Example 43 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When changing the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed relative to the image plane Sim, and the other lens groups move along the optical axis Z while changing the spacing between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of the single lens of the first intermediate lens group GM1 that is closest to the image side.
  • variable magnification optical system of Example 43 the basic lens data is shown in Table 127, the specifications and variable surface spacing in Table 128, the aspheric coefficients in Table 129, and each aberration diagram in Figure 87.
  • Example 44 The configuration and movement locus of the variable magnification optical system of Example 44 are shown in Figure 88.
  • the variable magnification optical system of Example 44 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having positive refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the final lens group GE When varying the magnification from the wide-angle end to the telephoto end, the final lens group GE is fixed with respect to the image plane Sim, and the other lens groups move along the optical axis Z while changing the intervals between adjacent lens groups.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of a single lens in the first intermediate lens group GM1 that is closest to the image side.
  • Example 45 The configuration and movement locus of the variable magnification optical system of Example 45 are shown in Figure 90.
  • the variable magnification optical system of Example 45 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having negative refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, and a second intermediate lens group GM2 having negative refractive power.
  • the focusing group is made up of the second intermediate lens group GM2.
  • the vibration reduction group is made up of a single lens in the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 45 the basic lens data is shown in Table 133, the specifications and variable surface spacing in Table 134, the aspheric coefficients in Table 135, and each aberration diagram in Figure 91.
  • Example 46 The configuration and movement locus of the variable magnification optical system of Example 46 are shown in Figure 92.
  • the variable magnification optical system of Example 46 is composed of, in order from the object side to the image side, a first lens group G1 having negative refractive power, an intermediate group GM, and a final lens group GE having negative refractive power.
  • the intermediate group GM is composed of, in order from the object side to the image side, a first intermediate lens group GM1 having positive refractive power, a second intermediate lens group GM2 having positive refractive power, and a third intermediate lens group GM3 having negative refractive power.
  • the focusing group is made up of the third intermediate lens group GM3.
  • the vibration reduction group is made up of a single lens in the first intermediate lens group GM1 that is closest to the object.
  • variable magnification optical system of Example 46 the basic lens data is shown in Table 136, the specifications and variable surface spacing in Table 137, the aspheric coefficients in Table 138, and each aberration diagram in Figure 93.
  • Tables 139 to 148 show the corresponding values of conditional expressions (1) to (34) for the variable magnification optical systems of Examples 1 to 46 described above.
  • the corresponding values of the Examples shown in Tables 139 to 148 may be used as the upper or lower limits of the conditional expressions to set preferred ranges for the conditional expressions.
  • Fig. 94 and Fig. 95 show external views of a camera 30 which is an imaging device according to an embodiment of the present disclosure.
  • Fig. 94 shows a perspective view of the camera 30 seen from the front side
  • Fig. 95 shows a perspective view of the camera 30 seen from the rear side.
  • the camera 30 is a so-called mirrorless type digital camera, to which an interchangeable lens 20 can be removably attached.
  • the interchangeable lens 20 is configured to include a variable magnification optical system 1 according to an embodiment of the present disclosure housed in a lens barrel.
  • Camera 30 has a camera body 31, and a shutter button 32 and a power button 33 are provided on the top surface of camera body 31.
  • operation units 34, 35, and a display unit 36 are provided on the back surface of camera body 31.
  • Display unit 36 is capable of displaying a captured image and an image within the angle of view before capture.
  • a shooting aperture through which light from the subject is incident is provided in the center of the front of the camera body 31, and a mount 37 is provided at a position corresponding to the shooting aperture, and an interchangeable lens 20 is attached to the camera body 31 via the mount 37.
  • the camera body 31 contains an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the subject image formed by the interchangeable lens 20, a signal processing circuit that processes the imaging signal output from the imaging element to generate an image, and a recording medium for recording the generated image.
  • an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the subject image formed by the interchangeable lens 20, a signal processing circuit that processes the imaging signal output from the imaging element to generate an image, and a recording medium for recording the generated image.
  • CMOS Complementary Metal Oxide Semiconductor
  • the technology of the present disclosure has been described above using embodiments and examples, but the technology of the present disclosure is not limited to the above embodiments and examples, and various modifications are possible.
  • the radius of curvature, surface spacing, refractive index, Abbe number, aspheric coefficient, etc. of each lens are not limited to the values shown in the above examples, and may take other values.
  • the imaging device is not limited to the above example, and can take various forms, such as cameras other than mirrorless type, film cameras, video cameras, and security cameras.
  • the first lens group having negative refractive power an intermediate group made up of a plurality of lens groups, and a final lens group having negative refractive power
  • the distance between the first lens group and the intermediate lens group changes
  • the distance between the intermediate lens group and the final lens group changes
  • all distances between adjacent lens groups in the intermediate lens group change.
  • a focusing group that moves along the optical axis during focusing is disposed closer to the image side than the first lens group;
  • TLw is the sum of the distance on the optical axis from the lens surface of the first lens group closest to the object side to the lens surface of the final lens group closest to the image side when focused on an object at infinity at the wide-angle end, and the back focus in terms of the air equivalent distance of the entire system;
  • the focal length of the entire system when focused on an object at infinity at the wide-angle end is fw.
  • the maximum half angle of view when focused on an object at infinity at the wide-angle end is ⁇ w.
  • variable magnification optical system according to claim 4 which satisfies the conditional expression (1-4) represented by: [Additional Note 6] 0.2 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.25 (2-1)
  • conditional expression (2-1) represented by: [Additional Note 7] 0.25 ⁇ Bfw/(fw ⁇ tan ⁇ w) ⁇ 1.1 (2-2)
  • variable magnification optical system When the maximum F-number at the wide-angle end is FNow and the lens is focused on an object at infinity, 2.3 ⁇ FNow/tan ⁇ w ⁇ 7 (4)
  • variable magnification optical system according to any one of supplementary items 1 to 16, which satisfies conditional expression (6) represented by: [Additional Item 18] -7 ⁇ ft/f1 ⁇ -0.9 (6-1)
  • the intermediate group includes a vibration reduction group that moves in a direction intersecting with the optical axis during image blur correction, If the focal length of the image stabilization group is posted, 0.3 ⁇ ft/
  • variable magnification optical system according to claim 1 or 2, wherein the intermediate group includes, in order from the object side to the image side, at least a first intermediate lens group having positive refractive power, a second intermediate lens group having refractive power, and a third intermediate lens group having refractive power.
  • the intermediate group includes, in order from the object side to the image side, at least a first intermediate lens group having positive refractive power, a second intermediate lens group having refractive power, and a third intermediate lens group having refractive power.
  • variable magnification optical system When the focal length of the intermediate lens group when focused on an object at infinity at the wide-angle end is fMw, 0.2 ⁇ ft/fMw ⁇ 7.5 (9)
  • the variable magnification optical system according to any one of supplementary items 1 to 27, which satisfies conditional expression (9) represented by: [Additional Item 29]
  • the focal length of the entire system when focused on an object at infinity at the telephoto end is ft.
  • variable magnification optical system according to any one of supplementary items 1 to 28, which satisfies conditional expression (10) represented by: [Additional Item 30] -10 ⁇ ft/fme ⁇ -1.5 (10-1)
  • Additional Item 31 The focal length of the entire system when focused on an object at infinity at the telephoto end is ft.
  • variable magnification optical system according to any one of supplementary items 1 to 30, which satisfies conditional expression (11) represented by: [Additional Item 32] 0.1 ⁇ ft/fE ⁇ 0.7 (11-1)
  • the focal length of the first lens group is f1
  • the focal length of the lens unit located closest to the object side among the intermediate lens units is fm1, -5 ⁇ f1/fm1 ⁇ -0.05 (12)
  • the variable magnification optical system according to any one of supplementary items 1 to 32, which satisfies conditional expression (12) represented by: [Additional Item 34] the lens group located closest to the object side among the intermediate groups has positive refractive power, The focal length of the intermediate lens group located closest to the object side is fm1.
  • variable magnification optical system according to any one of supplementary items 1 to 33, which satisfies conditional expression (13) represented by: [Additional Item 35]
  • the maximum F-number when the lens is focused on an object at infinity at the telephoto end is FNot.
  • ft When the focal length of the entire system at the telephoto end is focused on an object at infinity, ft is expressed as follows: 1.5 ⁇ FNot/(ft/fw) ⁇ 7 (14)
  • the focal length of the entire system when focused on an object at infinity at the telephoto end is ft.
  • variable magnification optical system according to any one of supplementary items 1 to 35, which satisfies conditional expression (15) represented by: [Additional Item 37] the lens unit located closest to the image side of the intermediate group has negative refractive power, The focal length of the lens unit located closest to the image side of the intermediate group is fme, If the focal length of the final lens group is fE, -9 ⁇ fme/fE ⁇ -0.05 (16)
  • the variable magnification optical system according to any one of supplementary items 1 to 36 which satisfies conditional expression (16) represented by: [Additional Item 38] -3 ⁇ fme/fE ⁇ -0.35 (16-1)
  • the variable magnification optical system according to claim 37 which satisfies the conditional expression (16-1) shown below.
  • the focal length of the first lens group is f1, When the focal length of the intermediate lens group when focused on an object at infinity at the wide-angle end is fMw, 0.2 ⁇ (-f1)/fMw ⁇ 5 (17)
  • the focal length of the first lens group is f1, When the focal length of the entire system at the telephoto end is focused on an object at infinity, ft is expressed as follows: 0.3 ⁇ (-f1)/(fw ⁇ ft) 1/2 ⁇ 2 (18)
  • the focal length of the intermediate lens group when focused on an object at infinity at the wide-angle end is fMw, When the focal length of the entire system at the telephoto end is focused on
  • variable magnification optical system according to any one of supplementary items 1 to 41, which satisfies conditional expression (20) represented by: [Additional Item 43] 2.5 ⁇ TLw/fw ⁇ 7 (21)
  • the focal length of the entire system when focused on an object at infinity at the telephoto end is ft.
  • variable magnification optical system according to any one of supplementary items 1 to 43, which satisfies conditional expression (22) represented by: [Additional Item 45] If the focal length of the focusing group is ffoc, 0.15 ⁇ fw/
  • variable magnification optical system which satisfies conditional expression (28) represented by: [Additional Item 51] the variable magnification optical system includes an aperture stop, The focal length of the first lens group is f1, When the composite focal length from the lens closest to the object side in the first lens group to the aperture stop in a state in which the lens is focused on an object at infinity at the wide-angle end is fL1STw, -3 ⁇ f1/fL1STw ⁇ -0.1 (29)
  • the variable magnification optical system according to any one of supplementary items 1 to 50, which satisfies conditional expression (29) represented by: [Additional Item 52] the variable magnification optical system includes an aperture stop, When the composite focal length from the lens closest to the object side in the first lens group to the aperture stop in a state focused on an object at infinity
  • variable magnification optical system according to any one of claims 1 to 56, wherein the final lens group is fixed with respect to an image plane during magnification variation.
  • Additional Item 60 60.
  • variable magnification optical system according to any one of items 1 to 60, wherein the first lens group is made up of three single lenses that are not cemented together.
  • first lens group is composed of two lenses.
  • second lens group is composed of two lenses.
  • third lens group is composed of two lenses.
  • focusing group is composed of two lenses.
  • 64 3. The variable magnification optical system according to claim 1, wherein the focusing group is composed of one lens.
  • 65 65.
  • An imaging apparatus comprising the variable magnification optical system according to any one of claims 1 to 64.

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012027283A (ja) * 2010-07-24 2012-02-09 Canon Inc ズームレンズ及びそれを有する撮像装置
JP2019040029A (ja) * 2017-08-24 2019-03-14 富士フイルム株式会社 ズームレンズおよび撮像装置
JP2020190661A (ja) * 2019-05-22 2020-11-26 キヤノン株式会社 ズームレンズ、およびそれを有する光学機器
JP2022112484A (ja) * 2021-01-21 2022-08-02 富士フイルム株式会社 ズームレンズおよび撮像装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012027283A (ja) * 2010-07-24 2012-02-09 Canon Inc ズームレンズ及びそれを有する撮像装置
JP2019040029A (ja) * 2017-08-24 2019-03-14 富士フイルム株式会社 ズームレンズおよび撮像装置
JP2020190661A (ja) * 2019-05-22 2020-11-26 キヤノン株式会社 ズームレンズ、およびそれを有する光学機器
JP2022112484A (ja) * 2021-01-21 2022-08-02 富士フイルム株式会社 ズームレンズおよび撮像装置

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