JP6033904B2 - Large-aperture telephoto zoom lens with anti-vibration function - Google Patents

Large-aperture telephoto zoom lens with anti-vibration function Download PDF

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JP6033904B2
JP6033904B2 JP2015030920A JP2015030920A JP6033904B2 JP 6033904 B2 JP6033904 B2 JP 6033904B2 JP 2015030920 A JP2015030920 A JP 2015030920A JP 2015030920 A JP2015030920 A JP 2015030920A JP 6033904 B2 JP6033904 B2 JP 6033904B2
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敦志 山崎
敦志 山崎
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Sigma Inc
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本発明は、一眼レフカメラ用に好適な、防振機能を有する大口径望遠ズームレンズに関する。   The present invention relates to a large-aperture telephoto zoom lens having an image stabilization function suitable for a single-lens reflex camera.

３５ミリ判撮像素子サイズに対応した、望遠側の画角が１３度以下で、変倍比が３倍弱程度、ズーム全領域における開放Ｆ値が２．８程度の防振機能を有する大口径望遠ズームレンズとして特許文献１、２が開示されている。   Large aperture with anti-vibration function corresponding to a 35 mm image sensor size with a telescopic angle of view of 13 degrees or less, a zoom ratio of about 3 times, and an open F value in the entire zoom range of about 2.8. Patent Documents 1 and 2 are disclosed as telephoto zoom lenses.

また、小型撮像素子を用いたデジタル一眼レフカメラに対応した、望遠側の画角が１３度以下で、ズーム全領域における開放Ｆ値が２．８程度の大口径望遠ズームレンズとして特許文献３が開示されている。   Patent Document 3 discloses a large-aperture telephoto zoom lens corresponding to a digital single-lens reflex camera using a small image pickup device and having a telescopic angle of view of 13 degrees or less and an open F value in the entire zoom range of about 2.8. It is disclosed.

特開２００３−０９０９５８号公報JP 2003-090958 A

特開２００２−１６２５６４号公報JP 2002-162564 A

特開２００７−２１２８３０号公報JP 2007-212830 A

特許文献１及び２に開示された光学系は、３５ｍｍ判フィルムフォーマット一眼レフカメラ用に設計されている。これらの光学系において画角を変えずに像高Ｙを小さくするには、光学系全体をスケーリングにより焦点距離ｆを短くすればよいが、この手法だとバックフォーカスも短くなる。   The optical systems disclosed in Patent Documents 1 and 2 are designed for 35 mm film format single-lens reflex cameras. In order to reduce the image height Y without changing the angle of view in these optical systems, the focal length f can be shortened by scaling the entire optical system, but this method also shortens the back focus.

しかし、従来の小型撮像素子（例えばＡＰＳ−Ｃサイズ相当）を使用したデジタル一眼レフカメラは、クイックリターンミラーがあるため、クイックリターンミラーに干渉しないようにバックフォーカスを長くしなければならない。また、過去の３５ミリ判用交換レンズを使いたいユーザーの要望を満たすため、上記小型撮像素子を搭載したデジタル一眼レフボディにおいても従来の３５ミリ判用一眼レフカメラと同一のフランジバックを確保する必要があった。   However, since a digital single-lens reflex camera using a conventional small imaging device (e.g., APS-C size) has a quick return mirror, the back focus must be lengthened so as not to interfere with the quick return mirror. In addition, in order to satisfy the needs of users who want to use the past 35 mm format interchangeable lenses, it is necessary to ensure the same flange back as the conventional 35 mm format single-lens reflex camera even in the digital single-lens reflex body equipped with the above-mentioned small image sensor. was there.

また特許文献１に開示された光学系は、望遠端において画面中心から周辺までの像面の平坦性が不十分で、特に防振時の像面変動が大きいという問題があった。   In addition, the optical system disclosed in Patent Document 1 has a problem in that the flatness of the image surface from the center of the screen to the periphery is insufficient at the telephoto end, and the image surface fluctuation is particularly large during image stabilization.

特許文献２に開示された光学系は、全長はコンパクトであるが、各群のパワーが強いことによる球面収差の補正が不十分な問題があった。   The optical system disclosed in Patent Document 2 is compact in total length, but has a problem that correction of spherical aberration due to strong power of each group is insufficient.

特許文献３に開示された光学系は防振機能を有しておらず、防振機能を搭載することが課題となっていた。   The optical system disclosed in Patent Document 3 has no anti-vibration function, and mounting an anti-vibration function has been a problem.

本発明は、上記課題を解決し、特に小型撮像素子を搭載したデジタル一眼レフカメラに好適な、コンパクトで光学性能が良好な防振機能を有する大口径望遠ズームレンズを提供することを目的とする。   SUMMARY OF THE INVENTION An object of the present invention is to provide a large-aperture telephoto zoom lens having an anti-vibration function that is compact and has good optical performance, particularly suitable for a digital single-lens reflex camera equipped with a small image sensor. .

上記目的を達成するために、本発明の第１の発明に係る防振機能を有する大口径望遠ズームレンズは、物体側より順に、正屈折力を有する第１レンズ群と、負屈折力を有する第２レンズ群と、正屈折力を有する第３レンズ群と、正屈折力を有する第４レンズ群とからなり、前記第２レンズ群と前記第３レンズ群とを光軸に沿って移動させて変倍を行う４群ズームレンズにおいて、第４レンズ群は、物体側より順に、正屈折力を有する前群Ｇ４ｆ、負屈折力を有する中群Ｇ４ｍ、正屈折力を有する後群Ｇ４ｒより構成し、合焦に際して、前記第３レンズ群は光軸に沿って移動し、前記第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、以下の条件式を満足することを特徴とする。
（１）０．７＜｜Ｆ４ｒ／Ｆ４ｍ｜＜１．０
（２）０．３３≦｜Ｆ４ｍ／Ｆｔ｜＜０．４
ここで、Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離、Ｆ４ｒ：第４レンズ群後群Ｇ４ｒの焦点距離、Ｆｔ：望遠端におけるレンズ全系の焦点距離である。
また、本発明の第２の発明に係る防振機能を有する大口径望遠ズームレンズは、物体側より順に、正屈折力を有する第１レンズ群と、負屈折力を有する第２レンズ群と、正屈折力を有する第３レンズ群と、正屈折力を有する第４レンズ群とからなり、前記第１レンズ群は第１レンズ群前群と第１レンズ群後群からなり、前記第２レンズ群と前記第３レンズ群とを光軸に沿って移動させて変倍を行う４群ズームレンズにおいて、第４レンズ群は、物体側より順に、正屈折力を有する前群Ｇ４ｆ、負屈折力を有する中群Ｇ４ｍ、正屈折力を有する後群Ｇ４ｒより構成し、合焦に際して、前記第１レンズ群後群は光軸に沿って移動し、
前記第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、以下の条件式を満足することを特徴とする。
（１）０．７＜｜Ｆ４ｒ／Ｆ４ｍ｜＜１．０
（２）０．３３≦｜Ｆ４ｍ／Ｆｔ｜＜０．４
ここで、Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離、Ｆ４ｒ：第４レンズ群後群Ｇ４ｒの焦点距離、Ｆｔ：望遠端におけるレンズ全系の焦点距離である。 In order to achieve the above object, a large-aperture telephoto zoom lens having an anti-vibration function according to the first invention of the present invention has a first lens group having a positive refractive power and a negative refractive power in order from the object side. a second lens group, a third lens group having positive refractive power and a fourth lens group having positive refractive power, moving the second lens group and the third lens group along the optical axis In the four-group zoom lens that performs zooming, the fourth lens group includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power. At the time of focusing, the third lens group moves along the optical axis, and the image forming position is displaced by decentering the fourth lens group middle group G4m in a direction substantially perpendicular to the optical axis. It satisfies the conditional expression.
(1) 0.7 <| F4r / F4m | <1.0
(2) 0.33 ≦ | F4m / Ft | <0.4
Here, F4m: focal length of the fourth lens group middle group G4m, F4r: focal length of the fourth lens group rear group G4r, and Ft: focal length of the entire lens system at the telephoto end.
In addition, a large-aperture telephoto zoom lens having an anti-vibration function according to the second aspect of the present invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, The second lens unit includes a third lens group having positive refracting power and a fourth lens group having positive refracting power. The first lens group includes a front group of the first lens group and a rear group of the first lens group. In the four-group zoom lens that performs zooming by moving the group and the third lens group along the optical axis, the fourth lens group includes, in order from the object side, a front group G4f having a positive refractive power, a negative refractive power A rear group G4r having a positive refractive power, and when focusing, the rear group of the first lens group moves along the optical axis,
The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis to displace the image forming position, and satisfies the following conditional expression.
(1) 0.7 <| F4r / F4m | <1.0
(2) 0.33 ≦ | F4m / Ft | <0.4
Here, F4m: focal length of the fourth lens group middle group G4m, F4r: focal length of the fourth lens group rear group G4r, and Ft: focal length of the entire lens system at the telephoto end.

さらに本発明を実施の防振機能を有する大口径望遠ズームレンズは、上記発明において、第４レンズ群前群Ｇ４ｆは少なくとも２つの正レンズを有することが好ましい。   Furthermore, in the above-described invention, the large-aperture telephoto zoom lens having an anti-vibration function according to the present invention is preferably configured such that the fourth lens unit front group G4f includes at least two positive lenses.

本発明を実施の防振機能を有する大口径望遠ズームレンズによれば、特に小型撮像素子を搭載したデジタル一眼レフカメラに好適な、コンパクトで光学性能が良好な防振機能を有する大口径望遠ズームレンズを提供することができる。   According to the large-aperture telephoto zoom lens having an anti-vibration function embodying the present invention, a large-diameter telephoto zoom having an anti-vibration function that is compact and has good optical performance, particularly suitable for a digital single-lens reflex camera equipped with a small image sensor. A lens can be provided.

実施例１のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Example 1 at infinity at the wide-angle end 実施例１のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 1 at infinity at the wide-angle end 実施例１のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 1 at infinity at the telephoto end 実施例１のズームレンズの広角端の無限遠における標準状態での横収差図Lateral aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 1 実施例１のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 1 実施例１のズームレンズの広角端の無限遠においてレンズが０．４８°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 1 when the lens is shaken at 0.48 ° at infinity at the wide-angle end. 実施例１のズームレンズの望遠端の無限遠においてレンズが０．３°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 1 when the lens is shaken at 0.3 degrees in the telephoto end at infinity. 実施例２のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 2 at infinity at the wide-angle end 実施例２のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 2 実施例２のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 2 at infinity at the telephoto end 実施例２のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 2 実施例２のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 2 実施例２のズームレンズの広角端の無限遠においてレンズが０．４８°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 2 when the lens is shaken at 0.48 ° at infinity at the wide-angle end. 実施例２のズームレンズの望遠端の無限遠においてレンズが０．３°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 2 when the lens is shaken at 0.3 ° at infinity at the telephoto end. 実施例３のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 3 at infinity at the wide-angle end 実施例３のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram of the zoom lens of Example 3 at infinity at the wide-angle end 実施例３のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity of the telephoto end of the zoom lens of Example 3 実施例３のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens of Example 3 実施例３のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 3 実施例３のズームレンズの広角端の無限遠においてレンズが０．４８°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 3 when the lens is shaken at 0.48 ° at infinity at the wide-angle end. 実施例３のズームレンズの望遠端の無限遠においてレンズが０．３°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 3 when the lens is shaken at 0.3 ° at infinity at the telephoto end. 実施例４のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 4 at infinity at the wide-angle end 実施例４のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 4 実施例４のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the telephoto end of the zoom lens of Example 4 実施例４のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens in Example 4 実施例４のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 4 実施例４のズームレンズの広角端の無限遠においてレンズが０．４８°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 4 when the lens is shaken at 0.48 ° at infinity at the wide-angle end. 実施例４のズームレンズの望遠端の無限遠においてレンズが０．３°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 4 when the lens is shaken at 0.3 ° at infinity at the telephoto end. 実施例５のズームレンズの広角端の無限遠におけるレンズ断面図Sectional view of the zoom lens of Embodiment 5 at infinity at the wide-angle end 実施例５のズームレンズの広角端の無限遠における縦収差図Longitudinal aberration diagram at infinity at the wide-angle end of the zoom lens in Example 5 実施例５のズームレンズの望遠端の無限遠における縦収差図Longitudinal aberration diagram at infinity of the telephoto end of the zoom lens of Example 5 実施例５のズームレンズの広角端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the wide-angle end of the zoom lens in Example 5 実施例５のズームレンズの望遠端の無限遠における標準状態での横収差図Transverse aberration diagram in the standard state at infinity at the telephoto end of the zoom lens of Example 5 実施例５のズームレンズの広角端の無限遠においてレンズが０．４８°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 5 when the lens is shaken at 0.48 ° at infinity at the wide-angle end. 実施例５のズームレンズの望遠端の無限遠においてレンズが０．３°傾いた状態で防振させたときの横収差図Lateral aberration diagram of the zoom lens of Example 5 when the lens is shaken at 0.3 ° at infinity at the telephoto end.

本発明の防振機能を有する大口径望遠ズームレンズは、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とから成り、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   The large-aperture telephoto zoom lens having an anti-vibration function according to the present invention includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a first lens group having a positive refractive power. The third lens group G3 includes a fourth lens group G4 having positive refractive power, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、正屈折力を有する第４レンズ群前群Ｇ４ｆ、負屈折力を有する第４レンズ群中群Ｇ４ｍ、正屈折力を有する第４レンズ群後群Ｇ４ｒより構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させて結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, a fourth lens group front group G4f having positive refractive power, a fourth lens group middle group G4m having negative refractive power, and a fourth lens group rear group G4r having positive refractive power. The image forming position is displaced by decentering the fourth lens group middle group G4m in a direction substantially perpendicular to the optical axis.

第４レンズ群前群Ｇ４ｆは正の屈折力により光束を収斂し、防振レンズ群である第４レンズ群中群Ｇ４ｍへの軸上光束の入射高を小さくし、第４レンズ群中群Ｇ４ｍを小さくする働きをしている。第４レンズ群中群Ｇ４ｍは防振敏感度を大きくするため大きな負の屈折力を持ち、第４レンズ群後群Ｇ４ｒは第４レンズ群中群Ｇ４ｍで発生した収差を補正する働きをしている。   The fourth lens group front group G4f converges the light beam by positive refractive power, reduces the incident height of the axial light beam on the fourth lens group middle group G4m, which is the anti-vibration lens group, and reduces the fourth lens group middle group G4m. It works to make it smaller. The fourth lens group middle group G4m has a large negative refracting power in order to increase the anti-vibration sensitivity, and the fourth lens group rear group G4r functions to correct aberrations generated in the fourth lens group middle group G4m. Yes.

本発明の防振機能を有する大口径望遠ズームレンズにおいて、第４レンズ群後群Ｇ４ｒのパワーを強くすると望遠側において糸巻き型の歪曲を小さくすることができる。しかしながら、第４レンズ群後群Ｇ４ｒのパワーを強くしすぎると、諸収差の発生を抑えながら必要なバックフォーカスを確保することが困難になる。そこで、次の条件式（１）を満足することが望ましい。
（１）０．７＜｜Ｆ４ｒ／Ｆ４ｍ｜＜１．０
ここで、Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離、Ｆ４ｒ：第４レンズ群後群Ｇ４ｒの焦点距離である。 In the large-aperture telephoto zoom lens having the image stabilization function of the present invention, when the power of the fourth lens unit rear group G4r is increased, the pincushion distortion can be reduced on the telephoto side. However, if the power of the fourth lens group rear group G4r is made too strong, it becomes difficult to ensure the necessary back focus while suppressing the occurrence of various aberrations. Therefore, it is desirable to satisfy the following conditional expression (1).
(1) 0.7 <| F4r / F4m | <1.0
Here, F4m is the focal length of the fourth lens group middle group G4m, and F4r is the focal length of the fourth lens group rear group G4r.

条件式（１）は、第４レンズ群中群Ｇ４ｍと第４レンズ群後群Ｇ４ｒの焦点距離の比を与えるものである。ここで簡単のため各群からなるレンズ系を薄肉レンズ系と考えると、レンズ全系のバックフォーカスＢＦは、第４レンズ群後群Ｇ４ｒの焦点距離Ｆ４ｒを用いて下記の式で表される。
ＢＦ＝Ｆ４ｒ＋ｚ’
ここで、ｚ’：第４レンズ群後群Ｇ４ｒの後側焦点から像面までの距離である。 Conditional expression (1) gives the ratio of the focal lengths of the fourth lens group middle group G4m and the fourth lens group rear group G4r. Here, for the sake of simplicity, assuming that the lens system including each group is a thin lens system, the back focus BF of the entire lens system is expressed by the following equation using the focal length F4r of the fourth lens group rear group G4r.
BF = F4r + z ′
Here, z ′ is the distance from the rear focal point of the fourth lens group rear group G4r to the image plane.

このときニュートンの結像式より、第４レンズ群後群Ｇ４ｒの倍率βＧ４ｒは下記の式で表せる。
βＧ４ｒ＝−ｚ’／Ｆ４ｒ At this time, the magnification βG4r of the fourth lens unit rear group G4r can be expressed by the following equation from Newton's imaging equation.
βG4r = −z ′ / F4r

これらの式より、第４レンズ群中群Ｇ４ｍの焦点距離Ｆ４ｍ一定、及びバックフォーカスＢＦ一定の条件下で、条件式（１）の下限値を越えて第４レンズ群後群Ｇ４ｒの焦点距離Ｆ４ｒが短くなると、第４レンズ群後群Ｇ４ｒの倍率負担が大きくなり、防振レンズ群である第４レンズ群中群Ｇ４ｍが手振れ補正のために光軸と略垂直方向に移動したときに発生するコマ収差及び非点収差の像面への影響が大きくなる。   From these expressions, the focal length F4r of the fourth lens group rear group G4r exceeds the lower limit of the conditional expression (1) under the condition that the focal length F4m of the fourth lens group middle group G4m is constant and the back focus BF is constant. Is shortened, the magnification burden on the rear group G4r of the fourth lens group increases, which occurs when the fourth lens group middle group G4m, which is an anti-vibration lens group, moves in a direction substantially perpendicular to the optical axis for camera shake correction. The influence of coma and astigmatism on the image plane is increased.

条件式（１）の上限値を超えて第４レンズ群後群Ｇ４ｒの焦点距離が長くなると、望遠端で発生する糸巻型の歪曲の補正効果が不足する。   When the upper limit of conditional expression (1) is exceeded and the focal length of the fourth lens group rear group G4r is increased, the effect of correcting the pincushion distortion that occurs at the telephoto end is insufficient.

また、本発明の防振機能を有する大口径望遠ズームレンズにおいて、第４レンズ群中群Ｇ４ｍのパワーを弱くすると非点収差をはじめ諸収差の補正がし易くなる。しかし、第４レンズ群中群Ｇ４ｍのパワーを弱くしすぎると、手振れ補正に必要な防振敏感度を確保することができない。そこで、次の条件式（２）を満足することが望ましい。
（２）０．３３≦｜Ｆ４ｍ／Ｆｔ｜＜０．４
ここで、Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離、Ｆｔ：望遠端におけるレンズ全系の焦点距離である。 Further, in the large-aperture telephoto zoom lens having the image stabilization function of the present invention, if the power of the fourth lens group middle group G4m is weakened, it becomes easy to correct various aberrations including astigmatism. However, if the power of the fourth lens group middle group G4m is too weak, it is not possible to secure the image stabilization sensitivity necessary for camera shake correction. Therefore, it is desirable to satisfy the following conditional expression (2).
(2) 0.33 ≦ | F4m / Ft | <0.4
Here, F4m is the focal length of the fourth lens group middle group G4m, and Ft is the focal length of the entire lens system at the telephoto end.

条件式（２）は、第４レンズ群中群Ｇ４ｍの焦点距離と望遠端における全系の焦点距離の比率を定めるものである。条件式（２）の下限を超えると第４レンズ群中群Ｇ４ｍの負のパワーが大きくなるので望遠端においてオーバーな球面収差の発生要因となる上に、防振時も含めた像面の平坦性の確保が難しくなる。   Conditional expression (2) defines the ratio of the focal length of the fourth lens group middle group G4m to the focal length of the entire system at the telephoto end. If the lower limit of conditional expression (2) is exceeded, the negative power of the fourth lens group middle group G4m will become large, which will cause excessive spherical aberration at the telephoto end, and the flatness of the image plane including during image stabilization. It becomes difficult to secure sex.

また、防振レンズ群の倍率をβｏｓ、防振レンズ群より像側のレンズ群の倍率をβｒｅａｒとすると、一般に防振敏感度Ｋｏｓは下記の式で表わされる。
Ｋｏｓ＝Δｉｍｇ／Δｘ＝−βｒｅａｒ×（１−βｏｓ）
ここで、Δｉｍｇ：結像面における像の移動量、Δｘ：防振レンズ群の移動量である。また、βｏｓは負の値をとる。 If the magnification of the image stabilizing lens group is βos and the magnification of the lens group on the image side from the image stabilizing lens group is βrear, the image stabilization sensitivity Kos is generally expressed by the following equation.
Kos = Δimg / Δx = −βreal × (1−βos)
Here, Δimg is the amount of movement of the image on the imaging plane, and Δx is the amount of movement of the image stabilizing lens group. Βos takes a negative value.

ここで、第４レンズ群後群Ｇ４ｒの焦点距離を上述した条件式（１）によって定めることとした場合、第４レンズ群中群Ｇ４ｍの焦点距離Ｆ４ｍが条件式（２）の上限を超えて長くなると、第４レンズ群Ｇ４内の各群の主点間距離が大きくなり、第４レンズ群Ｇ４の全長をコンパクトに構成することができない。   Here, when the focal length of the fourth lens group rear group G4r is determined by the conditional expression (1) described above, the focal length F4m of the fourth lens group middle group G4m exceeds the upper limit of the conditional expression (2). If it is longer, the distance between the principal points of each group in the fourth lens group G4 becomes larger, and the total length of the fourth lens group G4 cannot be made compact.

また、本発明の防振機能を有する大口径望遠ズームレンズにおいて、第４レンズ群前群Ｇ４ｆに少なくとも２つの正レンズを用いることで、球面収差の発生を抑えながら防振レンズ群である第４レンズ群中群Ｇ４ｍに入射するＦナンバー光線高を下げることができる。   Further, in the large-aperture telephoto zoom lens having the image stabilization function of the present invention, the fourth lens group is an image stabilization lens group while suppressing the occurrence of spherical aberration by using at least two positive lenses in the fourth lens group front group G4f. The height of the F number light beam incident on the lens group middle group G4m can be lowered.

以下、本発明の防振機能を有する大口径望遠ズームレンズに係る各実施例の説明及び数値実施例を示す。なお、各数値実施例において使用する記号の意味は以下のとおりである。   Hereinafter, explanations and numerical examples of the large-aperture telephoto zoom lens having the image stabilization function of the present invention will be shown. In addition, the meaning of the symbol used in each numerical example is as follows.

［全体諸元］中のｆは焦点距離、ＦｎｏはＦナンバー、Ｙは光軸からの最大像高を表す。   In [Overall Specifications], f represents the focal length, Fno represents the F number, and Y represents the maximum image height from the optical axis.

［レンズ諸元］中の第１列の番号は物体側からのレンズ面の番号、第２列ｒはレンズ面の曲率半径、第３列ｄはレンズ面間隔、第４列ｎｄはｄ線（波長λ＝５８７．５６ｎｍ）に対する屈折率、第５列νｄはｄ線に対するアッベ数である。第２列の「絞り」は絞り面を表し、第３列のＢｆはバックフォーカスを表す。   In the [lens specifications], the number of the first column is the lens surface number from the object side, the second column r is the radius of curvature of the lens surface, the third column d is the lens surface interval, and the fourth column nd is the d line ( The refractive index for the wavelength λ = 587.56 nm), the fifth column νd is the Abbe number for the d-line. “Aperture” in the second column represents the diaphragm surface, and Bf in the third column represents the back focus.

［無限遠撮影時の変倍における可変間隔］、［有限撮影時の変倍における可変間隔］はそれぞれの変倍における可変間隔の値を示す。   [Variable interval at zooming at infinity shooting] and [Variable interval at zooming at finite shooting] indicate the value of the variable interval at each zooming.

また、［条件式］は各数値実施例における本発明の各条件式の値を示す。   [Conditional expression] indicates the value of each conditional expression of the present invention in each numerical example.

なお、以下の全ての諸元の値において、記載している焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄ、その他の長さの単位は特記のない場合「ｍｍ」を使用するが、光学系では比例拡大と比例縮小とにおいても同等の光学性能が得られるので、これに限られるものではない。これらの記号は以降の他の実施例においても同様であり説明は省略する。   In all the following values of specifications, “mm” is used as the focal length f, radius of curvature r, lens surface interval d, and other length units unless otherwise specified. However, since the same optical performance can be obtained in proportional enlargement and proportional reduction, it is not limited to this. These symbols are the same in the following other embodiments, and the description thereof will be omitted.

図１は本発明の第１実施例にかかる防振機能を有する大口径望遠ズームレンズの構成を示す図であり、広角端焦点距離かつ無限遠合焦状態における各レンズ群の位置を示している。本実施例は、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とを備え、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   FIG. 1 is a diagram showing the configuration of a large-aperture telephoto zoom lens having an image stabilization function according to the first embodiment of the present invention, and shows the position of each lens group in a wide-angle end focal length and infinite focus state. . In this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive refractive power. The fourth lens group G4 is provided, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、物体側に凸形状の正レンズ２個からなり、全体として正屈折力を有する第４レンズ群前群Ｇ４ｆと、物体側より順に、正レンズと負レンズの接合レンズ、および両凹レンズからなり、全体として負屈折力を有する第４レンズ群中群Ｇ４ｍと、物体側より順に、両凸レンズ、曲率半径の小さな接合面を有する正レンズと負レンズの接合レンズ、および正レンズからなり、全体として正屈折力を有する第４レンズ群後群Ｇ４ｒとで構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させることで結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, two positive lenses convex toward the object side. The fourth lens group front group G4f having positive refractive power as a whole, and the positive lens and negative lens in order from the object side. The fourth lens group middle group G4m, which includes a cemented lens and a biconcave lens, and has a negative refractive power as a whole, and a biconvex lens, a positive lens having a cemented surface with a small curvature radius, and a negative lens are joined in this order from the object side The fourth lens group rear group G4r is composed of a lens and a positive lens and has a positive refractive power as a whole. The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis to thereby change the imaging position. Displace.

第１レンズ群Ｇ１は物体側より順に、正屈折力を有する第１レンズ群前群Ｇ１ｆと、正屈折力を有する第１レンズ群後群Ｇ１ｒより構成し、合焦に際しては第１レンズ群後群Ｇ１ｒが光軸方向に移動する構成とする。   The first lens group G1 includes, in order from the object side, a first lens group front group G1f having positive refractive power and a first lens group rear group G1r having positive refractive power. The group G1r is configured to move in the optical axis direction.

以下に、本発明の実施例１の数値実施例を示す。
［数値実施例１］
[全体緒元]
f 51.75 89.00 145.16
Fno 2.91 2.91 2.91
2ω 31.18 17.80 10.86

[レンズ緒元]
ｒ ｄ ｎｄ νｄ
[1] 3248.4181 2.0999 1.75519 27.52
[2] 100.0000 7.1906 1.49700 81.58
[3] -199.7513 d3
[4] 98.2751 4.7999 1.58913 61.23
[5] -1381.7627 0.1500
[6] 67.7156 5.1000 1.49700 81.58
[7] 523.2033 d7
[8] 1381.4180 3.9130 1.90365 31.30
[9] -44.4693 1.2501 1.75501 51.14
[10] 52.5904 3.1747
[11] -208.0105 1.2500 1.72916 54.65
[12] 27.6896 3.5207 1.84666 23.77
[13] 80.7573 2.9227
[14] -38.7145 1.2000 1.77250 49.60
[15] 144.6206 d15
[16] -367.3959 2.7500 1.77250 49.60
[17] -64.2818 0.1500
[18] 95.9776 5.3559 1.63854 55.43
[19] -33.2050 1.2499 1.72825 28.31
[20] -456.2932 d20
[21] 絞り 0.8986
[22] 94.3829 2.7924 1.49700 81.58
[23] 1495.7574 0.1500
[24] 39.2465 3.5450 1.49700 81.58
[25] 120.5521 16.6610
[26] -250.0000 3.4567 1.67270 32.16
[27] -30.1751 1.0000 1.48749 70.41
[28] 179.6793 2.3535
[29] -72.2077 1.0000 1.54072 47.18
[30] 43.3350 3.6972
[31] 161.8239 2.9442 1.65843 50.83
[32] -161.8239 0.1500
[33] 106.9463 7.3423 1.49700 81.58
[34] -24.0000 1.2000 1.84666 23.77
[35] -53.5543 0.1500
[36] 117.8936 2.5227 1.84666 23.77
[37] -8537.9193 Bf

[無限遠撮影時の変倍における可変間隔]
f 51.75 89.00 145.16
ｄ３ 9.8581 9.8581 9.8581
ｄ７ 2.1589 18.9030 28.3923
ｄ１５ 20.3923 13.6590 2.7885
ｄ２０ 15.7114 5.7000 7.0815
Ｂｆ 53.0053 52.9559 52.9645

[有限撮影時の変倍における可変間隔]
f 51.75 89.00 145.16
ｄ０ 2162.2871 3611.8100 5762.2888
ｄ３ 7.0806 8.1778 8.8251
ｄ７ 4.9364 20.5844 29.4255
ｄ１５ 20.3923 13.6590 2.7885
ｄ２０ 15.7114 5.7000 7.0815
Ｂｆ 53.0208 52.9320 52.9755

[条件式]
条件式(1) 条件式(2)
|F4r/F4m| |F4m/Ft|
条件範囲 0.7＜x＜1.0 0.33≦x＜0.4
実施例1 0.94 0.36
Hereinafter, numerical examples of the first embodiment of the present invention will be shown.
[Numerical Example 1]
[Overall specifications]
f 51.75 89.00 145.16
Fno 2.91 2.91 2.91
2ω 31.18 17.80 10.86

[Lens origin]
r d nd νd
[1] 3248.4181 2.0999 1.75519 27.52
[2] 100.0000 7.1906 1.49700 81.58
[3] -199.7513 d3
[4] 98.2751 4.7999 1.58913 61.23
[5] -1381.7627 0.1500
[6] 67.7156 5.1000 1.49700 81.58
[7] 523.2033 d7
[8] 1381.4180 3.9130 1.90365 31.30
[9] -44.4693 1.2501 1.75501 51.14
[10] 52.5904 3.1747
[11] -208.0105 1.2500 1.72916 54.65
[12] 27.6896 3.5207 1.84666 23.77
[13] 80.7573 2.9227
[14] -38.7145 1.2000 1.77250 49.60
[15] 144.6206 d15
[16] -367.3959 2.7500 1.77250 49.60
[17] -64.2818 0.1500
[18] 95.9776 5.3559 1.63854 55.43
[19] -33.2050 1.2499 1.72825 28.31
[20] -456.2932 d20
[21] Aperture 0.8986
[22] 94.3829 2.7924 1.49700 81.58
[23] 1495.7574 0.1500
[24] 39.2465 3.5450 1.49700 81.58
[25] 120.5521 16.6610
[26] -250.0000 3.4567 1.67270 32.16
[27] -30.1751 1.0000 1.48749 70.41
[28] 179.6793 2.3535
[29] -72.2077 1.0000 1.54072 47.18
[30] 43.3350 3.6972
[31] 161.8239 2.9442 1.65843 50.83
[32] -161.8239 0.1500
[33] 106.9463 7.3423 1.49700 81.58
[34] -24.0000 1.2000 1.84666 23.77
[35] -53.5543 0.1500
[36] 117.8936 2.5227 1.84666 23.77
[37] -8537.9193 Bf

[Variable interval for zooming at infinity]
f 51.75 89.00 145.16
d3 9.8581 9.8581 9.8581
d7 2.1589 18.9030 28.3923
d15 20.3923 13.6590 2.7885
d20 15.7114 5.7000 7.0815
Bf 53.0053 52.9559 52.9645

[Variable interval for zooming during finite shooting]
f 51.75 89.00 145.16
d0 2162.2871 3611.8100 5762.2888
d3 7.0806 8.1778 8.8251
d7 4.9364 20.5844 29.4255
d15 20.3923 13.6590 2.7885
d20 15.7114 5.7000 7.0815
Bf 53.0208 52.9320 52.9755

[Conditional expression]
Conditional expression (1) Conditional expression (2)
| F4r / F4m | | F4m / Ft |
Condition range 0.7 <x <1.0 0.33 ≦ x <0.4
Example 1 0.94 0.36

図８は本発明の第２実施例にかかる防振機能を有する大口径望遠ズームレンズの構成を示す図であり、広角端焦点距離かつ無限遠合焦状態における各レンズ群の位置を示している。本実施例は、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とを備え、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   FIG. 8 is a diagram showing the configuration of a large-aperture telephoto zoom lens having an image stabilization function according to the second embodiment of the present invention, and shows the position of each lens group in a wide-angle end focal length and infinite focus state. . In this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive refractive power. The fourth lens group G4 is provided, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、物体側に凸形状の正レンズ、および負レンズと正レンズの接合レンズからなり、全体として正屈折力を有する第４レンズ群前群Ｇ４ｆと、物体側より順に、物体側に凹形状の正レンズと負レンズの接合レンズからなり、全体として負屈折力を有する第４レンズ群中群Ｇ４ｍと、物体側より順に、両凸レンズ、曲率半径の小さな接合面を有する正レンズと負レンズの接合レンズ、および正レンズからなり、全体として正屈折力を有する第４レンズ群後群Ｇ４ｒとで構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させることで結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, a positive lens having a convex shape on the object side, and a cemented lens of a negative lens and a positive lens. The fourth lens group front group G4f has a positive refractive power as a whole, In order from the side, a fourth lens group middle group G4m having a negative refractive power as a whole, and a biconvex lens, a cemented piece having a small radius of curvature, in order from the object side. The fourth lens group rear group G4r is composed of a positive lens having a surface and a negative lens, and a positive lens, and has a positive refractive power as a whole. The fourth lens group middle group G4m is substantially perpendicular to the optical axis. The imaging position is displaced by decentering in the direction.

合焦に際しては第３レンズ群Ｇ３が光軸方向に移動する構成とする。   In focusing, the third lens group G3 is configured to move in the optical axis direction.

以下に、本発明の実施例２の数値実施例を示す。
［数値実施例２］
[全体緒元]
f 51.71 86.23 145.19
Fno 2.91 2.91 2.91
2ω 31.06 18.44 10.92

[レンズ緒元]
ｒ ｄ ｎｄ νｄ
[1] 210.9705 2.1000 1.72825 28.31
[2] 70.2091 7.4012 1.49700 81.58
[3] -833.3333 0.1500
[4] 184.0147 4.7515 1.49700 81.58
[5] -306.4044 0.1500
[6] 48.2661 7.5908 1.49700 81.58
[7] 321.7182 d7
[8] -1652.2833 3.1824 1.84666 23.77
[9] -55.9786 1.2000 1.58913 61.23
[10] 24.0422 5.1054
[11] -122.9992 1.1000 1.48749 70.41
[12] 27.2843 3.4238 1.84666 23.77
[13] 85.9864 3.9325
[14] -29.7930 1.1000 1.80609 33.26
[15] 893.6544 d15
[16] -2601.4505 2.7261 1.78589 43.92
[17] -62.7620 0.1500
[18] 102.9543 4.8444 1.63854 55.43
[19] -39.6691 1.1500 1.84666 23.77
[20] -142.8091 d20
[21] 絞り 0.9000
[22] 28.5451 7.0000 1.49700 81.58
[23] 無限 1.6183
[24] 無限 1.0105 1.71300 53.92
[25] 20.0458 5.3210 1.56384 60.81
[26] -1462.7286 9.1001
[27] -103.3112 3.7435 1.84666 23.77
[28] -25.2796 0.8996 1.70154 41.13
[29] 39.3519 3.7000
[30] 71.4654 3.1656 1.63854 55.43
[31] -329.5531 0.1500
[32] 71.4244 7.6367 1.48749 70.41
[33] -24.0817 1.1000 1.80518 25.45
[34] -114.1760 0.1500
[35] 80.3515 3.2616 1.84666 23.77
[36] -515.4639 Bf

[無限遠撮影時の変倍における可変間隔]
f 51.71 86.23 145.19
ｄ７ 3.7694 17.9485 26.5043
ｄ１５ 19.2930 13.1252 2.5553
ｄ２０ 24.1224 16.1111 18.1252
Ｂｆ 48.0863 47.9744 47.9430

[有限撮影時の変倍における可変間隔]
f 51.71 86.23 145.19
ｄ０ 2001.2280 3305.0032 5401.2291
ｄ７ 3.7694 17.9485 26.5043
ｄ１５ 19.9478 14.2149 4.4344
ｄ２０ 23.4677 15.0214 16.2461
Ｂｆ 48.1032 48.0134 47.9989

[条件式]
条件式(1) 条件式(2)
|F4r/F4m| |F4m/Ft|
条件範囲 0.7＜x＜1.0 0.33≦x＜0.4
実施例2 0.90 0.34
A numerical example of the second embodiment of the present invention will be shown below.
[Numerical Example 2]
[Overall specifications]
f 51.71 86.23 145.19
Fno 2.91 2.91 2.91
2ω 31.06 18.44 10.92

[Lens origin]
r d nd νd
[1] 210.9705 2.1000 1.72825 28.31
[2] 70.2091 7.4012 1.49700 81.58
[3] -833.3333 0.1500
[4] 184.0147 4.7515 1.49700 81.58
[5] -306.4044 0.1500
[6] 48.2661 7.5908 1.49700 81.58
[7] 321.7182 d7
[8] -1652.2833 3.1824 1.84666 23.77
[9] -55.9786 1.2000 1.58913 61.23
[10] 24.0422 5.1054
[11] -122.9992 1.1000 1.48749 70.41
[12] 27.2843 3.4238 1.84666 23.77
[13] 85.9864 3.9325
[14] -29.7930 1.1000 1.80609 33.26
[15] 893.6544 d15
[16] -2601.4505 2.7261 1.78589 43.92
[17] -62.7620 0.1500
[18] 102.9543 4.8444 1.63854 55.43
[19] -39.6691 1.1500 1.84666 23.77
[20] -142.8091 d20
[21] Aperture 0.9000
[22] 28.5451 7.0000 1.49700 81.58
[23] Infinite 1.6183
[24] Infinite 1.0105 1.71300 53.92
[25] 20.0458 5.3210 1.56384 60.81
[26] -1462.7286 9.1001
[27] -103.3112 3.7435 1.84666 23.77
[28] -25.2796 0.8996 1.70154 41.13
[29] 39.3519 3.7000
[30] 71.4654 3.1656 1.63854 55.43
[31] -329.5531 0.1500
[32] 71.4244 7.6367 1.48749 70.41
[33] -24.0817 1.1000 1.80518 25.45
[34] -114.1760 0.1500
[35] 80.3515 3.2616 1.84666 23.77
[36] -515.4639 Bf

[Variable interval for zooming at infinity]
f 51.71 86.23 145.19
d7 3.7694 17.9485 26.5043
d15 19.2930 13.1252 2.5553
d20 24.1224 16.1111 18.1252
Bf 48.0863 47.9744 47.9430

[Variable interval for zooming during finite shooting]
f 51.71 86.23 145.19
d0 2001.2280 3305.0032 5401.2291
d7 3.7694 17.9485 26.5043
d15 19.9478 14.2149 4.4344
d20 23.4677 15.0214 16.2461
Bf 48.1032 48.0134 47.9989

[Conditional expression]
Conditional expression (1) Conditional expression (2)
| F4r / F4m | | F4m / Ft |
Condition range 0.7 <x <1.0 0.33 ≦ x <0.4
Example 2 0.90 0.34

図１５は本発明の第３実施例にかかる防振機能を有する大口径望遠ズームレンズの構成を示す図であり、広角端焦点距離かつ無限遠合焦状態における各レンズ群の位置を示している。本実施例は、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とを備え、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   FIG. 15 is a diagram showing the configuration of a large-aperture telephoto zoom lens having an image stabilization function according to the third embodiment of the present invention, and shows the position of each lens group in a wide-angle end focal length and infinite focus state. . In this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive refractive power. The fourth lens group G4 is provided, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、物体側に凸形状の正レンズ、および負レンズと正レンズの接合レンズからなり、全体として正屈折力を有する第４レンズ群前群Ｇ４ｆと、物体側より順に、物体側に凹形状の正レンズと負レンズの接合レンズからなり、全体として負屈折力を有する第４レンズ群中群Ｇ４ｍと、物体側より順に、曲率半径の小さな接合面を有する正レンズと負レンズの接合レンズ、および正レンズからなり、全体として正屈折力を有する第４レンズ群後群Ｇ４ｒとで構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させることで結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, a positive lens having a convex shape on the object side, and a cemented lens of a negative lens and a positive lens. The fourth lens group front group G4f has a positive refractive power as a whole, In order from the object side, the fourth lens unit middle group G4m is composed of a concave positive lens and a negative lens on the object side, and has negative refractive power as a whole, and has a cemented surface with a small radius of curvature in order from the object side. The fourth lens group rear group G4r is composed of a positive lens and a negative lens cemented lens and a positive lens, and has a positive refractive power as a whole. The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis. By doing so, the imaging position is displaced.

合焦に際しては第３レンズ群Ｇ３が光軸方向に移動する構成とする。   In focusing, the third lens group G3 is configured to move in the optical axis direction.

以下に、本発明の実施例３の数値実施例を示す。
［数値実施例３］
[全体緒元]
f 51.64 86.17 145.22
Fno 2.92 2.92 2.92
2ω 30.98 18.43 10.91

[レンズ緒元]
ｒ ｄ ｎｄ νｄ
[1] 210.9705 2.1000 1.72825 28.31
[2] 72.3860 7.0142 1.49700 81.58
[3] -833.3333 0.1500
[4] 196.6675 4.2596 1.49700 81.58
[5] -435.1466 0.1500
[6] 50.3060 7.3258 1.49700 81.58
[7] 321.6262 d7
[8] 5741.1292 3.0615 1.84666 23.77
[9] -63.3203 1.2000 1.58913 61.23
[10] 24.2628 5.6234
[11] -195.2955 1.1000 1.48749 70.41
[12] 26.5740 5.2948 1.84666 23.77
[13] 70.0696 4.2407
[14] -28.9298 1.1000 1.80610 33.26
[15] -583.8707 d15
[16] -253.6068 2.8198 1.80610 40.72
[17] -49.9399 0.1500
[18] 92.8352 5.0264 1.62041 60.32
[19] -38.3504 1.1500 1.80518 25.45
[20] -197.8323 d20
[21] 絞り 0.9000
[22] 30.8427 5.6462 1.65843 50.83
[23] 99.7455 3.2875
[24] 71.4218 0.9963 1.78589 43.92
[25] 20.5126 5.2041 1.49700 81.58
[26] -1000.0000 9.1000
[27] -91.9704 3.6759 1.84666 23.77
[28] -25.1110 0.9000 1.70154 41.13
[29] 40.4479 4.5545
[30] 58.0303 8.4951 1.48749 70.41
[31] -21.4587 1.1000 1.80518 25.45
[32] -49.6860 0.1500
[33] 81.3705 3.3233 1.84666 23.77
[34] -515.4639 Bf

[無限遠撮影時の変倍における可変間隔]
f 51.64 86.17 145.22
ｄ７ 3.0742 19.1185 28.9138
ｄ１５ 17.9510 12.3420 2.6343
ｄ２０ 25.0693 14.6339 14.5464
Ｂｆ 48.9059 48.7807 48.7251

[有限撮影時の変倍における可変間隔]
f 51.64 86.17 145.22
ｄ０ 2001.2280 3305.0032 5401.2291
ｄ７ 3.0742 19.1185 28.9138
ｄ１５ 18.5621 13.3460 4.3768
ｄ２０ 24.4582 13.6299 12.8039
Ｂｆ 48.9256 48.8338 48.7906

[条件式]
条件式(1) 条件式(2)
|F4r/F4m| |F4m/Ft|
条件範囲 0.7＜x＜1.0 0.33≦x＜0.4
実施例3 0.99 0.33
A numerical example of the third embodiment of the present invention will be shown below.
[Numerical Example 3]
[Overall specifications]
f 51.64 86.17 145.22
Fno 2.92 2.92 2.92
2ω 30.98 18.43 10.91

[Lens origin]
r d nd νd
[1] 210.9705 2.1000 1.72825 28.31
[2] 72.3860 7.0142 1.49700 81.58
[3] -833.3333 0.1500
[4] 196.6675 4.2596 1.49700 81.58
[5] -435.1466 0.1500
[6] 50.3060 7.3258 1.49700 81.58
[7] 321.6262 d7
[8] 5741.1292 3.0615 1.84666 23.77
[9] -63.3203 1.2000 1.58913 61.23
[10] 24.2628 5.6234
[11] -195.2955 1.1000 1.48749 70.41
[12] 26.5740 5.2948 1.84666 23.77
[13] 70.0696 4.2407
[14] -28.9298 1.1000 1.80610 33.26
[15] -583.8707 d15
[16] -253.6068 2.8198 1.80610 40.72
[17] -49.9399 0.1500
[18] 92.8352 5.0264 1.62041 60.32
[19] -38.3504 1.1500 1.80518 25.45
[20] -197.8323 d20
[21] Aperture 0.9000
[22] 30.8427 5.6462 1.65843 50.83
[23] 99.7455 3.2875
[24] 71.4218 0.9963 1.78589 43.92
[25] 20.5126 5.2041 1.49700 81.58
[26] -1000.0000 9.1000
[27] -91.9704 3.6759 1.84666 23.77
[28] -25.1110 0.9000 1.70154 41.13
[29] 40.4479 4.5545
[30] 58.0303 8.4951 1.48749 70.41
[31] -21.4587 1.1000 1.80518 25.45
[32] -49.6860 0.1500
[33] 81.3705 3.3233 1.84666 23.77
[34] -515.4639 Bf

[Variable interval for zooming at infinity]
f 51.64 86.17 145.22
d7 3.0742 19.1185 28.9138
d15 17.9510 12.3420 2.6343
d20 25.0693 14.6339 14.5464
Bf 48.9059 48.7807 48.7251

[Variable interval for zooming during finite shooting]
f 51.64 86.17 145.22
d0 2001.2280 3305.0032 5401.2291
d7 3.0742 19.1185 28.9138
d15 18.5621 13.3460 4.3768
d20 24.4582 13.6299 12.8039
Bf 48.9256 48.8338 48.7906

[Conditional expression]
Conditional expression (1) Conditional expression (2)
| F4r / F4m | | F4m / Ft |
Condition range 0.7 <x <1.0 0.33 ≦ x <0.4
Example 3 0.99 0.33

図２２は本発明の第４実施例にかかる防振機能を有する大口径望遠ズームレンズの構成を示す図であり、広角端焦点距離かつ無限遠合焦状態における各レンズ群の位置を示している。本実施例は、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とを備え、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   FIG. 22 is a diagram showing the configuration of a large-aperture telephoto zoom lens having an image stabilization function according to the fourth embodiment of the present invention, and shows the position of each lens group in a wide-angle end focal length and infinite focus state. . In this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive refractive power. The fourth lens group G4 is provided, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、物体側に凸形状の正レンズ２個からなり、全体として正屈折力を有する第４レンズ群前群Ｇ４ｆと、物体側より順に、正レンズと負レンズの接合レンズ、および両凹レンズからなり、全体として負屈折力を有する第４レンズ群中群Ｇ４ｍと、物体側より順に、両凸レンズ、曲率半径の小さな接合面を有する正レンズと負レンズの接合レンズ、および正レンズからなり、全体として正屈折力を有する第４レンズ群後群Ｇ４ｒとで構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させることで結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, two positive lenses convex toward the object side. The fourth lens group front group G4f having positive refractive power as a whole, and the positive lens and negative lens in order from the object side. The fourth lens group middle group G4m, which includes a cemented lens and a biconcave lens, and has a negative refractive power as a whole, and a biconvex lens, a positive lens having a cemented surface with a small curvature radius, and a negative lens are joined in this order from the object side The fourth lens group rear group G4r is composed of a lens and a positive lens and has a positive refractive power as a whole. The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis to thereby change the imaging position. Displace.

合焦に際しては第３レンズ群Ｇ３が光軸方向に移動する構成とする。   In focusing, the third lens group G3 is configured to move in the optical axis direction.

以下に、本発明の実施例４の数値実施例を示す。
［数値実施例４］
[全体緒元]
f 51.67 86.17 145.20
Fno 2.93 2.93 2.93
2ω 30.97 18.42 10.91

[レンズ緒元]
ｒ ｄ ｎｄ νｄ
[1] 210.9705 1.0000 1.80610 33.26
[2] 59.9226 8.3302 1.45860 90.16
[3] -833.3333 0.1500
[4] 67.0789 7.1491 1.59282 68.60
[5] -4010.3993 0.1500
[6] 60.9995 6.2506 1.49700 81.58
[7] 396.4031 d7
[8] 297.3858 4.1728 1.90365 31.30
[9] -41.8035 1.2000 1.77250 49.60
[10] 24.6898 4.9143
[11] -84.0388 1.1000 1.48749 70.41
[12] 26.1929 3.8620 1.84666 23.77
[13] 141.6380 3.2964
[14] -28.0878 1.1000 1.80450 39.62
[15] 482.9657 d15
[16] -554.2901 2.9176 1.77250 49.60
[17] -51.5792 0.1500
[18] 90.9956 5.3358 1.51680 64.17
[19] -37.2515 1.1500 1.84666 23.77
[20] -94.2666 d20
[21] 絞り 0.9000
[22] 27.3103 7.0000 1.49700 81.58
[23] 34.4421 3.1008
[24] 43.7534 3.1694 1.49700 81.58
[25] 405.3435 9.8798
[26] -200.0000 3.1043 1.84666 23.77
[27] -37.2597 0.8000 1.63980 34.56
[28] 450.2168 0.7202
[29] -240.4234 0.8000 1.65843 50.83
[30] 39.2689 2.7930
[31] 65.4580 2.8739 1.78589 43.92
[32] 1282.6554 0.1500
[33] 75.5783 7.8357 1.45860 90.16
[34] -19.8767 1.1000 1.90365 31.30
[35] -85.4744 2.5579
[36] 131.1081 3.5106 1.90365 31.30
[37] -108.5436 Bf

[無限遠撮影時の変倍における可変間隔]
f 51.67 86.17 145.20
ｄ７ 3.6875 17.1222 25.5254
ｄ１５ 16.5838 11.4230 2.2811
ｄ２０ 19.7042 11.4303 12.1689
Ｂｆ 48.0845 47.9751 47.9513

[有限撮影時の変倍における可変間隔]
f 51.67 86.17 145.20
ｄ０ 2001.2280 3305.0032 5401.2291
ｄ７ 3.6875 17.1222 25.5254
ｄ１５ 17.1251 12.3047 3.8024
ｄ２０ 19.1628 10.5487 10.6477
Ｂｆ 48.0978 48.0017 48.0003

[条件式]
条件式(1) 条件式(2)
|F4r/F4m| |F4m/Ft|
条件範囲 0.7＜x＜1.0 0.33≦x＜0.4
実施例4 0.99 0.35
Hereinafter, numerical examples of the fourth embodiment of the present invention will be described.
[Numerical Example 4]
[Overall specifications]
f 51.67 86.17 145.20
Fno 2.93 2.93 2.93
2ω 30.97 18.42 10.91

[Lens origin]
r d nd νd
[1] 210.9705 1.0000 1.80610 33.26
[2] 59.9226 8.3302 1.45860 90.16
[3] -833.3333 0.1500
[4] 67.0789 7.1491 1.59282 68.60
[5] -4010.3993 0.1500
[6] 60.9995 6.2506 1.49700 81.58
[7] 396.4031 d7
[8] 297.3858 4.1728 1.90365 31.30
[9] -41.8035 1.2000 1.77250 49.60
[10] 24.6898 4.9143
[11] -84.0388 1.1000 1.48749 70.41
[12] 26.1929 3.8620 1.84666 23.77
[13] 141.6380 3.2964
[14] -28.0878 1.1000 1.80450 39.62
[15] 482.9657 d15
[16] -554.2901 2.9176 1.77250 49.60
[17] -51.5792 0.1500
[18] 90.9956 5.3358 1.51680 64.17
[19] -37.2515 1.1500 1.84666 23.77
[20] -94.2666 d20
[21] Aperture 0.9000
[22] 27.3103 7.0000 1.49700 81.58
[23] 34.4421 3.1008
[24] 43.7534 3.1694 1.49700 81.58
[25] 405.3435 9.8798
[26] -200.0000 3.1043 1.84666 23.77
[27] -37.2597 0.8000 1.63980 34.56
[28] 450.2168 0.7202
[29] -240.4234 0.8000 1.65843 50.83
[30] 39.2689 2.7930
[31] 65.4580 2.8739 1.78589 43.92
[32] 1282.6554 0.1500
[33] 75.5783 7.8357 1.45860 90.16
[34] -19.8767 1.1000 1.90365 31.30
[35] -85.4744 2.5579
[36] 131.1081 3.5106 1.90365 31.30
[37] -108.5436 Bf

[Variable interval for zooming at infinity]
f 51.67 86.17 145.20
d7 3.6875 17.1222 25.5254
d15 16.5838 11.4230 2.2811
d20 19.7042 11.4303 12.1689
Bf 48.0845 47.9751 47.9513

[Variable interval for zooming during finite shooting]
f 51.67 86.17 145.20
d0 2001.2280 3305.0032 5401.2291
d7 3.6875 17.1222 25.5254
d15 17.1251 12.3047 3.8024
d20 19.1628 10.5487 10.6477
Bf 48.0978 48.0017 48.0003

[Conditional expression]
Conditional expression (1) Conditional expression (2)
| F4r / F4m | | F4m / Ft |
Condition range 0.7 <x <1.0 0.33 ≦ x <0.4
Example 4 0.99 0.35

図２９は本発明の第５実施例にかかる防振機能を有する大口径望遠ズームレンズの構成を示す図であり、広角端焦点距離かつ無限遠合焦状態における各レンズ群の位置を示している。本実施例は、物体側より順に、正屈折力を有する第１レンズ群Ｇ１と、負屈折力を有する第２レンズ群Ｇ２と、正屈折力を有する第３レンズ群Ｇ３と、正屈折力を有する第４レンズ群Ｇ４とを備え、第２レンズ群Ｇ２と第３レンズ群Ｇ３とを光軸に沿って移動させて変倍を行う。   FIG. 29 is a diagram showing the configuration of a large-aperture telephoto zoom lens having an image stabilization function according to the fifth embodiment of the present invention, and shows the position of each lens group in a wide-angle end focal length and infinite focus state. . In this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive refractive power. The fourth lens group G4 is provided, and zooming is performed by moving the second lens group G2 and the third lens group G3 along the optical axis.

第４レンズ群Ｇ４は、物体側より順に、物体側に凸形状の正レンズ、および負レンズと正レンズの接合レンズからなり、全体として正屈折力を有する第４レンズ群前群Ｇ４ｆと、物体側より順に、物体側に凹形状の正レンズと負レンズの接合レンズからなり、全体として負屈折力を有する第４レンズ群中群Ｇ４ｍと、物体側より順に、両凸レンズ、曲率半径の小さな接合面を有する正レンズと負レンズの接合レンズ、および正レンズからなり、全体として正屈折力を有する第４レンズ群後群Ｇ４ｒとで構成し、第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させることで結像位置を変位させる。   The fourth lens group G4 includes, in order from the object side, a positive lens having a convex shape on the object side, and a cemented lens of a negative lens and a positive lens. The fourth lens group front group G4f has a positive refractive power as a whole, In order from the side, a fourth lens group middle group G4m having a negative refractive power as a whole, and a biconvex lens, a cemented piece having a small radius of curvature, in order from the object side. The fourth lens group rear group G4r is composed of a positive lens having a surface and a negative lens, and a positive lens, and has a positive refractive power as a whole. The fourth lens group middle group G4m is substantially perpendicular to the optical axis. The imaging position is displaced by decentering in the direction.

合焦に際しては第３レンズ群Ｇ３が光軸方向に移動する構成とする。   In focusing, the third lens group G3 is configured to move in the optical axis direction.

以下に、本発明の実施例５の数値実施例を示す。
［数値実施例５］
[全体緒元]
f 51.70 86.23 145.25
Fno 2.92 2.92 2.92
2ω 31.02 18.43 10.92

[レンズ緒元]
ｒ ｄ ｎｄ νｄ
[1] 210.9705 2.1000 1.72825 28.31
[2] 72.6291 7.2541 1.49700 81.58
[3] -833.3333 0.1500
[4] 189.0241 4.6156 1.49700 81.58
[5] -338.4505 0.1500
[6] 49.4882 7.4083 1.49700 81.58
[7] 311.5445 d7
[8] 1598.4233 2.9493 1.84666 23.77
[9] -69.5018 1.2000 1.58913 61.23
[10] 24.6191 7.1610
[11] -82.3936 1.1000 1.48749 70.41
[12] 29.1565 3.3939 1.84666 23.77
[13] 110.0999 3.6234
[14] -32.8138 1.1000 1.80610 33.26
[15] 1234.9758 d15
[16] 1949.6189 2.5517 1.80610 40.72
[17] -76.3640 0.1500
[18] 122.1990 4.7437 1.62041 60.32
[19] -37.2157 1.1500 1.80518 25.45
[20] -129.6646 d20
[21] 絞り 0.9000
[22] 30.3400 7.0000 1.65843 50.83
[23] -138.7198 1.4544
[24] -120.6932 1.2127 1.78589 43.92
[25] 25.2273 5.2828 1.49700 81.58
[26] -1000.0000 9.1000
[27] -104.9649 3.7760 1.84666 23.77
[28] -25.0000 0.8996 1.70154 41.13
[29] 38.1279 3.7000
[30] 73.2735 2.8931 1.65843 50.83
[31] 無限 0.1500
[32] 67.1839 8.3334 1.48749 70.41
[33] -21.7888 1.1000 1.80518 25.45
[34] -87.7582 0.1500
[36] 86.7751 3.6097 1.84666 23.77
[37] -188.7959 Bf

[無限遠撮影時の変倍における可変間隔]
f 51.70 86.23 145.25
ｄ７ 5.2205 19.1119 27.5949
ｄ１５ 21.1211 14.2490 2.4669
ｄ２０ 19.2957 12.2763 15.5755
Ｂｆ 48.0365 48.0367 48.0333

[有限撮影時の変倍における可変間隔]
f 51.70 86.23 145.25
ｄ０ 2001.2280 3305.0032 5401.2291
ｄ７ 5.2205 19.1119 27.5949
ｄ１５ 21.9149 15.5653 4.7370
ｄ２０ 18.5019 10.9600 13.3055
Ｂｆ 48.0385 48.0403 48.0324

[条件式]
条件式(1) 条件式(2)
|F4r/F4m| |F4m/Ft|
条件範囲 0.7＜x＜1.0 0.33≦x＜0.4
実施例5 0.88 0.33
Hereinafter, numerical examples of the fifth embodiment of the present invention will be described.
[Numerical Example 5]
[Overall specifications]
f 51.70 86.23 145.25
Fno 2.92 2.92 2.92
2ω 31.02 18.43 10.92

[Lens origin]
r d nd νd
[1] 210.9705 2.1000 1.72825 28.31
[2] 72.6291 7.2541 1.49700 81.58
[3] -833.3333 0.1500
[4] 189.0241 4.6156 1.49700 81.58
[5] -338.4505 0.1500
[6] 49.4882 7.4083 1.49700 81.58
[7] 311.5445 d7
[8] 1598.4233 2.9493 1.84666 23.77
[9] -69.5018 1.2000 1.58913 61.23
[10] 24.6191 7.1610
[11] -82.3936 1.1000 1.48749 70.41
[12] 29.1565 3.3939 1.84666 23.77
[13] 110.0999 3.6234
[14] -32.8138 1.1000 1.80610 33.26
[15] 1234.9758 d15
[16] 1949.6189 2.5517 1.80610 40.72
[17] -76.3640 0.1500
[18] 122.1990 4.7437 1.62041 60.32
[19] -37.2157 1.1500 1.80518 25.45
[20] -129.6646 d20
[21] Aperture 0.9000
[22] 30.3400 7.0000 1.65843 50.83
[23] -138.7198 1.4544
[24] -120.6932 1.2127 1.78589 43.92
[25] 25.2273 5.2828 1.49700 81.58
[26] -1000.0000 9.1000
[27] -104.9649 3.7760 1.84666 23.77
[28] -25.0000 0.8996 1.70154 41.13
[29] 38.1279 3.7000
[30] 73.2735 2.8931 1.65843 50.83
[31] Infinite 0.1500
[32] 67.1839 8.3334 1.48749 70.41
[33] -21.7888 1.1000 1.80518 25.45
[34] -87.7582 0.1500
[36] 86.7751 3.6097 1.84666 23.77
[37] -188.7959 Bf

[Variable interval for zooming at infinity]
f 51.70 86.23 145.25
d7 5.2205 19.1119 27.5949
d15 21.1211 14.2490 2.4669
d20 19.2957 12.2763 15.5755
Bf 48.0365 48.0367 48.0333

[Variable interval for zooming during finite shooting]
f 51.70 86.23 145.25
d0 2001.2280 3305.0032 5401.2291
d7 5.2205 19.1119 27.5949
d15 21.9149 15.5653 4.7370
d20 18.5019 10.9600 13.3055
Bf 48.0385 48.0403 48.0324

[Conditional expression]
Conditional expression (1) Conditional expression (2)
| F4r / F4m | | F4m / Ft |
Condition range 0.7 <x <1.0 0.33 ≦ x <0.4
Example 5 0.88 0.33

Ｓ：開口絞り
Ｉ：像面
Ｇ１：第１レンズ群
Ｇ１ｆ：第１レンズ群前群
Ｇ１ｒ：第１レンズ群後群
Ｇ２：第２レンズ群
Ｇ３：第３レンズ群
Ｇ４：第４レンズ群
Ｇ４ｆ：第４レンズ群前群
Ｇ４ｍ：第４レンズ群中群
Ｇ４ｒ：第４レンズ群後群
Ｃ Ｃ線（波長λ＝６５６．３ｎｍ）
ｄ ｄ線（波長λ＝５８７．６ｎｍ）
ｇ ｇ線（波長λ＝４３５．８ｎｍ）
Ｙ 像高
ΔＳ サジタル像面
ΔＭ メリジオナル像面 S: aperture stop I: image plane G1: first lens group G1f: first lens group front group G1r: first lens group rear group G2: second lens group G3: third lens group G4: fourth lens group G4f: Fourth lens group front group G4m: Fourth lens group middle group G4r: Fourth lens group rear group CC line (wavelength λ = 656.3 nm)
dd line (wavelength λ = 587.6 nm)
g g line (wavelength λ = 435.8 nm)
Y Image height ΔS Sagittal image plane ΔM Meridional image plane

Claims (3)

物体側より順に、
正屈折力を有する第１レンズ群と、
負屈折力を有する第２レンズ群と、
正屈折力を有する第３レンズ群と、
正屈折力を有する第４レンズ群とからなり、
前記第２レンズ群と前記第３レンズ群とを光軸に沿って移動させて変倍を行う４群ズームレンズにおいて、
前記第４レンズ群は、物体側より順に、正屈折力を有する前群Ｇ４ｆ、負屈折力を有する中群Ｇ４ｍ、正屈折力を有する後群Ｇ４ｒより構成し、
合焦に際して、前記第３レンズ群は光軸に沿って移動し、
前記第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、
以下の条件式を満足することを特徴とする防振機能を有する大口径望遠ズームレンズ。
（１）０．７＜｜Ｆ４ｒ／Ｆ４ｍ｜＜１．０
（２）０．３３≦｜Ｆ４ｍ／Ｆｔ｜＜０．４
Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離
Ｆ４ｒ：第４レンズ群後群Ｇ４ｒの焦点距離
Ｆｔ：望遠端におけるレンズ全系の焦点距離 From the object side,
A first lens group having positive refractive power;
A second lens group having negative refractive power;
A third lens group having positive refractive power;
A fourth lens group having positive refractive power,
In a four-group zoom lens that performs zooming by moving the second lens group and the third lens group along the optical axis,
The fourth lens group includes, in order from the object side, the front group G4f having positive refractive power, the middle group G4m having negative refractive power, constructed from the group G4r after having positive refractive power,
Upon focusing, the third lens group moves along the optical axis,
The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis to displace the imaging position,
A large-aperture telephoto zoom lens having an anti-vibration function characterized by satisfying the following conditional expression:
(1) 0.7 <| F4r / F4m | <1.0
(2) 0.33 ≦ | F4m / Ft | <0.4
F4m: focal length of the fourth lens group middle group G4m F4r: focal length of the fourth lens group rear group G4r Ft: focal length of the entire lens system at the telephoto end 物体側より順に、From the object side,
正屈折力を有する第１レンズ群と、A first lens group having positive refractive power;
負屈折力を有する第２レンズ群と、A second lens group having negative refractive power;
正屈折力を有する第３レンズ群と、A third lens group having positive refractive power;
正屈折力を有する第４レンズ群とからなり、A fourth lens group having positive refractive power,
前記第１レンズ群は第１レンズ群前群と第１レンズ群後群からなり、The first lens group includes a first lens group front group and a first lens group rear group,
前記第２レンズ群と前記第３レンズ群とを光軸に沿って移動させて変倍を行う４群ズームレンズにおいて、In a four-group zoom lens that performs zooming by moving the second lens group and the third lens group along the optical axis,
第４レンズ群は、物体側より順に、正屈折力を有する前群Ｇ４ｆ、負屈折力を有する中群Ｇ４ｍ、正屈折力を有する後群Ｇ４ｒより構成し、The fourth lens group includes, in order from the object side, a front group G4f having positive refractive power, a middle group G4m having negative refractive power, and a rear group G4r having positive refractive power,
合焦に際して、前記第１レンズ群後群は光軸に沿って移動し、Upon focusing, the rear group of the first lens group moves along the optical axis,
前記第４レンズ群中群Ｇ４ｍを光軸と略垂直方向に偏心させて結像位置を変位する構成とし、The fourth lens group middle group G4m is decentered in a direction substantially perpendicular to the optical axis to displace the imaging position,
以下の条件式を満足することを特徴とする防振機能を有する大口径望遠ズームレンズ。A large-aperture telephoto zoom lens having an anti-vibration function characterized by satisfying the following conditional expression:
（１）０．７＜｜Ｆ４ｒ／Ｆ４ｍ｜＜１．０(1) 0.7 <| F4r / F4m | <1.0
（２）０．３３≦｜Ｆ４ｍ／Ｆｔ｜＜０．４(2) 0.33 ≦ | F4m / Ft | <0.4
Ｆ４ｍ：第４レンズ群中群Ｇ４ｍの焦点距離F4m: Focal length of the fourth lens group middle group G4m
Ｆ４ｒ：第４レンズ群後群Ｇ４ｒの焦点距離F4r: Focal length of the fourth lens group rear group G4r
Ｆｔ：望遠端におけるレンズ全系の焦点距離Ft: focal length of the entire lens system at the telephoto end 前記第４レンズ群前群Ｇ４ｆは、少なくとも２つの正レンズを有することを特徴とする請求項１または２に記載の防振機能を有する大口径望遠ズームレンズ。The large-aperture telephoto zoom lens having an anti-vibration function according to claim 1, wherein the fourth lens group front group G4f includes at least two positive lenses.
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