JP2003329924A - Telephotographic macro lens optical system - Google Patents
Telephotographic macro lens optical systemInfo
- Publication number
- JP2003329924A JP2003329924A JP2002135804A JP2002135804A JP2003329924A JP 2003329924 A JP2003329924 A JP 2003329924A JP 2002135804 A JP2002135804 A JP 2002135804A JP 2002135804 A JP2002135804 A JP 2002135804A JP 2003329924 A JP2003329924 A JP 2003329924A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- optical system
- positive
- negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、無限遠から等倍近傍ま
での撮影が可能な望遠マクロレンズ光学系に関する。
【０００２】
【従来の技術】従来の望遠マクロレンズ光学系は、例え
ば焦点距離ｆ＝２００ｍｍ（特開昭６１−１３２９１６
号）であって、等倍まで合焦可能であって、物体側先端
の対物レンズ群を合焦レンズ群としている。他の従来の
望遠マクロレンズ光学系としては、合焦レンズ群である
大きい重量の対物レンズ群の大きな移動量による問題を
軽減するために、対物レンズ群以外のレンズ群の移動に
よってて合焦を行い、重量の大きい対物レンズ群を動か
さずに合焦を行う構成が提案されている。
【０００３】すなわち、特開２００１−２１７９８号公
報及び特開２００１−３３７０４号公報においては、物
体側から順に、正の第１レンズ群、負の第２レンズ群、
正の第３レンズ群、負の第４レンズ群からなる構成で、
第２レンズ群を像側へ、第３レンズ群を物体側へ移動さ
せることによって、像面位置を一定としたとき物体をレ
ンズに近づけることと同じ効果を得ている。
【０００４】
【発明が解決しようとする課題】従来の望遠マクロレン
ズ光学系は、一般に、レンズ全長が長い問題に加えて、
物体側先端の対物レンズ群が、その重量が大きく、また
光学系の重心から離れているため、撮影時の望遠マクロ
レンズ光学系を装着したカメラの固定すなわち手ブレの
発生等を防ぐことを困難にしている。
【０００５】従来の望遠マクロレンズ光学系においては
また、合焦レンズ群の大きな移動量に起因して、撮影距
離の変化に伴って有効Ｆナンバーが大きく変化するとい
う問題がある。例えば、特開平９−２１３１９号に開示
されいる焦点距離ｆ＝１８０ｍｍで、合焦レンズ群の焦
点距離がｆ＝−５０．１０８４及びｆ＝２０５．１９５
７ｍｍの望遠マクロレンズ光学系において、撮影距離の
変化に伴って有効Ｆナンバーは、３．６〜５．９３と変
化する。
【０００６】一方、特開２００１−２１７９８号公報及
び特開２００１−３３７０４号公報に開示された望遠マ
クロレンズ光学系においては、合焦のために第２レンズ
群を像側へ、第３レンズ群を物体側へ移動させる構成で
あるが、第１レンズ群の口径が大きくまた望遠マクロレ
ンズ光学系の全長が長い問題がある。
【０００７】
【発明の目的】本発明は、従来技術の望遠マクロレンズ
光学系における上述した問題点に鑑みてなされたもので
あって、レンズ全長が比較的短く、物体側先端の対物レ
ンズ群が、その重量が小さく、撮影時の望遠マクロレン
ズ光学系を装着したカメラの固定すなわち手ブレの発生
等を防ぎ易い望遠マクロレンズ光学系を提供することを
ことを目的とする。
【０００８】本発明はまた、撮影距離の変化に伴う有効
Ｆナンバーの変化が少なく、使い勝手のよい望遠マクロ
レンズ光学系を提供することを目的とする。
【０００９】
【課題を解決する手段】本発明は、物体側から順に、正
の第１レンズ群、負の第２レンズ群、正の第３レンズ
群、負の第４レンズ群からなり、フォーカシングは、第
２レンズ群を像側に、第３レンズ群を対物側に移動さ
せ、第４レンズ群を非線型に移動させ又は像面に対して
固定とし、第２レンズ群の焦点距離をｆ2、無限遠時の
レンズ系全体の焦点距離をｆ∞、第３レンズ群の無限遠
位置から等倍位置までの移動量をｍ3とするとき、
であることを特徴とする望遠マクロレンズ光学系であ
る。
【００１０】本発明は、正負正負の４群構成のパワー配
置を適切としたため、合焦群の移動量を削減し、かつ光
学系全長を短縮している。第２レンズ群の焦点距離をｆ
2、無限遠時の全系の焦点距離をf∞とすると、
であれば、第２レンズ群の移動量を少なくし、また、球
面収差、像面湾曲の無限遠から等倍までの変化を少なく
することができる。
【００１１】（１）式の範囲を超えて第２レンズ群の焦
点距離が短くなると、球面収差と像面湾曲の撮影距離に
よる変化が大きくなり、収差補正上好ましくない。ま
た、（１）式の範囲を超えて第２レンズ群の焦点距離が
長くなると、第２レンズ群のフォーカシングに際しての
移動量が大きくなり、光学系の全長の増大を招く。ま
た、第３レンズ群の無限遠位置から等倍位置までの移動
量をm3とすると、
であれば、第３レンズ群の移動量を適切に抑えることが
でき、光学系の全長を抑えることができる。
【００１２】
【第１実施形態】本発明の第１実施形態の望遠マクロレ
ンズ光学系１００を、図に基づいて説明する。望遠マク
ロレンズ光学系１００は、図１に示すように、物体側か
ら順に、正の第１レンズ群ＬＧ１、負の第２レンズ群Ｌ
Ｇ２、正の第３レンズ群ＬＧ３、負の第４レンズ群ＬＧ
４からなる。近距離への合焦に際しては、第２レンズ群
ＬＧ２を像側に、第３レンズ群ＬＧ３を対物側に動か
し、第４レンズ群ＬＧ４は非線型に移動又は像面に対し
て固定となっている。
【００１３】第１レンズ群ＬＧ１は、正正負正と負正の
接合レンズからなる。第２レンズ群ＬＧ２は、負負正の
３枚からなる。第３レンズ群ＬＧ３は、正負の接合の２
枚からなる。第４レンズ群ＬＧ４は、負正の２枚からな
る。絞りＳは、第２レンズ群ＬＧ２と第３レンズ群ＬＧ
３の間に配置される。
【００１４】望遠マクロレンズ光学系１００の光学的デ
ータは以下のとおりである。Ｎｏ．は面番号を示し、Ｒ
は曲率（ｍｍ）を示し、Ｄは間隔（厚さ）を示し、Ｎｄ
はｄ線の屈折率を示し、Ｖｄは分散率を示し、ｆは焦点
距離（ｍｍ）を示す。
【００１５】第１実施形態の望遠マクロレンズ光学系１
００の無限遠での収差は、図２に示すとおりである。第
１実施形態の望遠マクロレンズ光学系１００の1/2倍で
の収差図は、図３に示すとおりである。第１実施形態の
望遠マクロレンズ光学系１００の等倍での収差図は、図
４に示すとおりである。
【００１６】
【第２実施形態】本発明の第２実施形態の望遠マクロレ
ンズ光学系２００を、図に基づいて説明する。望遠マク
ロレンズ光学系２００は、図５に示すように、物体側か
ら順に、正の第１レンズ群ＬＧ１１、負の第２レンズ群
ＬＧ２１、正の第３レンズ群ＬＧ３１、負の第４レンズ
群ＬＧ４１からなる。近距離への合焦に際しては、第２
レンズ群ＬＧ２１を像側に、第３レンズ群ＬＧ３１を対
物側に動かし、第４レンズ群ＬＧ４１は非線型に移動又
は像面に対して固定となっている。
【００１７】第１レンズ群ＬＧ１１は正正負正と負正の
接合レンズからなり、第２レンズ群ＬＧ２１は負負正の
３枚からなり、第３レンズ群ＬＧ３１は正と正負の接合
レンズの３枚からなり、第４レンズ群ＬＧ４１は負正の
２枚からなる。絞りは第２レンズ群ＬＧ２１と第３レン
ズ群ＬＧ３１の間に位置する。近距離への合焦は第２レ
ンズ群ＬＧ２１を像側に、第３レンズ群ＬＧ３１を対物
側に、第４レンズ群ＬＧ４１を非線型に移動して行う。
【００１８】望遠マクロレンズ光学系２００の光学的デ
ータは以下のとおりである。Ｎｏ．は面番号を示し、Ｒ
は曲率（ｍｍ）を示し、Ｄは間隔（厚さ）を示し、Ｎｄ
はｄ線の屈折率を示し、Ｖｄは分散率を示し、ｆは焦点
距離（ｍｍ）を示す。
【００１９】
【００２０】第２実施形態の望遠マクロレンズ光学系２
００の無限遠での収差は、図６に示すとおりである。第
２実施形態の望遠マクロレンズ光学系２００の1/2倍で
の収差図は、図７に示すとおりである。第２実施形態の
望遠マクロレンズ光学系２００の等倍での収差図は、図
８に示すとおりである。
【００２１】望遠マクロレンズ光学系２００において
は、望遠マクロレンズ光学系１００に対し、第３レンズ
群に正レンズを１枚追加することにより、球面収差と軸
上の色収差を抑えつつ、第３レンズ群の移動量を減少さ
せた。また、第４レンズ群を非線型に移動させることに
より、撮影倍率が1/10倍から1/2倍の間における非点収
差の変動を抑えることができた。
【００２２】
【発明の効果】本発明の望遠マクロレンズ光学系によれ
ば、レンズ全長が比較的短く、物体側先端の対物レンズ
群が、その重量が小さく、撮影時の望遠マクロレンズ光
学系を装着したカメラの固定すなわち手ブレの発生等を
防ぎ易い望遠マクロレンズ光学系を構成することができ
る効果を有する。本発明によればまた、撮影距離の変化
に伴う有効Ｆナンバーの変化が少なく、使い勝手のよい
望遠マクロレンズ光学系を提供することを目的とする。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephoto macro lens optical system capable of photographing from infinity to near the same magnification. 2. Description of the Related Art A conventional telephoto macro lens optical system has, for example, a focal length f = 200 mm (JP-A-61-132916).
And the objective lens group at the front end on the object side is a focusing lens group. As another conventional telephoto macro lens optical system, in order to reduce a problem due to a large moving amount of a heavy objective lens group which is a focusing lens group, focusing is performed by moving a lens group other than the objective lens group. A configuration has been proposed in which focusing is performed without moving a heavy objective lens group. That is, in JP-A-2001-21798 and JP-A-2001-33704, in order from the object side, a positive first lens group, a negative second lens group,
With a configuration including a positive third lens group and a negative fourth lens group,
By moving the second lens group to the image side and the third lens group to the object side, the same effect as bringing the object closer to the lens when the image plane position is fixed is obtained. [0004] In general, the conventional telephoto macro lens optical system has a problem that the total length of the lens is long,
Since the objective lens group at the object side tip is heavy and far from the center of gravity of the optical system, it is difficult to fix the camera equipped with the telephoto macro lens optical system during shooting, that is, to prevent camera shake etc. I have to. The conventional telephoto macro lens optical system also has a problem that the effective F-number greatly changes with a change in the photographing distance due to a large moving amount of the focusing lens group. For example, the focal length f = 180 mm disclosed in JP-A-9-21319, and the focal lengths of the focusing lens unit are f = -50.1084 and f = 205.195.
In a 7 mm telephoto macro lens optical system, the effective F-number changes from 3.6 to 5.93 as the shooting distance changes. On the other hand, in the telephoto macro lens optical system disclosed in JP-A-2001-21798 and JP-A-2001-33704, the second lens group is moved toward the image side for focusing, and the third lens group is focused on. Is moved to the object side, but there is a problem that the aperture of the first lens group is large and the total length of the telephoto macro lens optical system is long. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the telephoto macro lens optical system of the prior art, and has a relatively short overall lens length and an objective lens group at the front end on the object side. It is an object of the present invention to provide a telephoto macro lens optical system which has a small weight and is easy to fix a camera equipped with the tele macro lens optical system at the time of photographing, that is, to prevent occurrence of camera shake. Another object of the present invention is to provide an easy-to-use telephoto macro lens optical system in which a change in the effective F-number due to a change in the photographing distance is small. The present invention comprises, in order from the object side, a first positive lens unit, a second negative lens unit, a third positive lens unit, and a fourth negative lens unit. Moves the second lens group to the image side, moves the third lens group to the object side, moves the fourth lens group in a non-linear manner or fixes it to the image plane, and sets the focal length of the second lens group to f 2, the focal length of the entire lens system at the time infinity f ∞, when the amount of movement to the magnification position and m 3 from an infinite position of the third lens group, This is a telephoto macro lens optical system. In the present invention, since the power arrangement of the four groups of positive, negative, positive and negative is made appropriate, the amount of movement of the focusing group is reduced and the overall length of the optical system is shortened. Let the focal length of the second lens group be f
2, an infinite a focal length of the time far When f ∞, If so, the amount of movement of the second lens group can be reduced, and the change in spherical aberration and field curvature from infinity to 1: 1 can be reduced. If the focal length of the second lens unit is short beyond the range of the expression (1), the change of the spherical aberration and the field curvature depending on the shooting distance becomes large, which is not preferable in terms of aberration correction. If the focal length of the second lens group becomes longer than the range of the expression (1), the amount of movement of the second lens group at the time of focusing increases, and the total length of the optical system increases. Also, assuming that the moving amount of the third lens unit from the infinity position to the equal magnification position is m 3 , If so, the amount of movement of the third lens group can be appropriately suppressed, and the total length of the optical system can be reduced. First Embodiment A telephoto macro lens optical system 100 according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the telephoto macro lens optical system 100 includes a positive first lens group LG1 and a negative second lens group L in order from the object side.
G2, a positive third lens group LG3, a negative fourth lens group LG
Consists of four. When focusing on a short distance, the second lens group LG2 is moved to the image side, the third lens group LG3 is moved to the object side, and the fourth lens group LG4 is moved non-linearly or fixed to the image plane. I have. The first lens group LG1 is composed of positive, positive, negative, positive and negative and positive cemented lenses. The second lens group LG2 includes three negative, positive, and negative lenses. The third lens group LG3 has two positive and negative junctions.
Consists of sheets. The fourth lens unit LG4 includes two negative and positive lenses. The stop S has a second lens group LG2 and a third lens group LG.
3 between. The optical data of the telephoto macro lens optical system 100 is as follows. No. Indicates a surface number, and R
Indicates a curvature (mm), D indicates an interval (thickness), and Nd
Denotes the refractive index of the d-line, Vd denotes the dispersion, and f denotes the focal length (mm). Telephoto macro lens optical system 1 of the first embodiment
The aberration at infinity of 00 is as shown in FIG. An aberration diagram at 1/2 times that of the telephoto macro lens optical system 100 according to the first embodiment is as shown in FIG. An aberration diagram at the same magnification of the telephoto macro lens optical system 100 of the first embodiment is as shown in FIG. Second Embodiment A telephoto macro lens optical system 200 according to a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 5, the telephoto macro lens optical system 200 includes, in order from the object side, a first positive lens group LG11, a second negative lens group LG21, a third positive lens group LG31, and a fourth negative lens group. It consists of LG41. When focusing on a short distance, the second
The lens group LG21 is moved to the image side, the third lens group LG31 is moved to the object side, and the fourth lens group LG41 is moved nonlinearly or is fixed to the image plane. The first lens group LG11 is composed of positive, positive, negative, positive and negative and positive cemented lenses, the second lens group LG21 is composed of three negative, negative and positive lenses, and the third lens group LG31 is composed of three positive and negative cemented lenses. The fourth lens group LG41 includes two negative and positive lenses. The stop is located between the second lens group LG21 and the third lens group LG31. Focusing on a short distance is performed by moving the second lens group LG21 to the image side, moving the third lens group LG31 to the object side, and moving the fourth lens group LG41 in a non-linear manner. The optical data of the telephoto macro lens optical system 200 is as follows. No. Indicates a surface number, and R
Indicates a curvature (mm), D indicates an interval (thickness), and Nd
Denotes the refractive index of the d-line, Vd denotes the dispersion, and f denotes the focal length (mm). [0019] Telephoto macro lens optical system 2 of the second embodiment
The aberration at infinity of 00 is as shown in FIG. An aberration diagram at 1/2 times that of the telephoto macro lens optical system 200 of the second embodiment is as shown in FIG. An aberration diagram at the same magnification of the telephoto macro lens optical system 200 of the second embodiment is as shown in FIG. In the telephoto macro lens optical system 200, by adding one positive lens to the third lens group with respect to the tele tele macro lens optical system 100, the third lens group can be suppressed while suppressing spherical aberration and axial chromatic aberration. The amount of group movement was reduced. Further, by moving the fourth lens group in a non-linear manner, it was possible to suppress the fluctuation of astigmatism when the photographing magnification was between 1/10 and 1/2. According to the telephoto macro lens optical system of the present invention, the total length of the lens is relatively short, and the objective lens group at the object side tip is small in weight. This has an effect that a telephoto macro lens optical system that can easily prevent the mounted camera, that is, the occurrence of camera shake, and the like can be configured. It is another object of the present invention to provide a user-friendly telephoto macro lens optical system in which a change in the effective F-number due to a change in shooting distance is small.
【図面の簡単な説明】
【図１】図１は、第１実施形態の望遠マクロレンズ光学
系の無限遠でのレンズ構成図である。
【図２】図２は、第１実施形態の望遠マクロレンズ光学
系の無限遠での収差図である。
【図３】図３は、第１実施形態の望遠マクロレンズ光学
系の1/2倍での収差図である。
【図４】図３は、第１実施形態の望遠マクロレンズ光学
系の等倍での収差図である。
【図５】図５は、第２実施形態の望遠マクロレンズ光学
系の無限遠でのレンズ構成図である。
【図６】図６は、第１実施形態の望遠マクロレンズ光学
系の無限遠での収差図である。
【図７】図７は、第１実施形態の望遠マクロレンズ光学
系の1/2倍での収差図である。
【図８】図８は、第１実施形態の望遠マクロレンズ光学
系の等倍での収差図である。
【符号の説明】
１００ 望遠マクロレンズ光学系
ＬＧ１ 第１レンズ群
ＬＧ２ 第２レンズ群
ＬＧ３ 第３レンズ群
ＬＧ４ 第４レンズ群
２００ 望遠マクロレンズ光学系
ＬＧ１１ 第１レンズ群
ＬＧ２１ 第２レンズ群
ＬＧ３１ 第３レンズ群
ＬＧ４１ 第４レンズ群BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a lens configuration diagram at an infinity of a telephoto macro lens optical system according to a first embodiment. FIG. 2 is an aberration diagram at infinity of a telephoto macro lens optical system according to the first embodiment. FIG. 3 is an aberration diagram at 1/2 times that of the telephoto macro lens optical system according to the first embodiment. FIG. 4 is an aberration diagram of the telephoto macro lens optical system according to the first embodiment at the same magnification. FIG. 5 is a lens configuration diagram at infinity of a telephoto macro lens optical system according to a second embodiment. FIG. 6 is an aberration diagram at an infinity of the telephoto macro lens optical system according to the first embodiment. FIG. 7 is an aberration diagram at 1/2 times that of the telephoto macro lens optical system according to the first embodiment. FIG. 8 is an aberration diagram at the same magnification of the telephoto macro lens optical system of the first embodiment. [Description of Signs] 100 Telephoto macro lens optical system LG1 First lens group LG2 Second lens group LG3 Third lens group LG4 Fourth lens group 200 Telephoto macro lens optical system LG11 First lens group LG21 Second lens group LG31 Third Lens group LG41 4th lens group
Claims (1)
の第２レンズ群、正の第３レンズ群、負の第４レンズ群
からなり、フォーカシングは、第２レンズ群を像側に、
第３レンズ群を対物側に移動させ、第４レンズ群を非線
型に移動させ又は像面に対して固定とし、第２レンズ群
の焦点距離をｆ2、無限遠時のレンズ系全体の焦点距離
をｆ∞、第３レンズ群の無限遠位置から等倍位置までの
移動量をｍ3とするとき、 であることを特徴とする望遠マクロレンズ光学系。Claims 1. A positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group are arranged in this order from the object side. Two lens groups on the image side
The third lens group is moved to the object side, the fourth lens group is moved nonlinearly or fixed to the image plane, the focal length of the second lens group is f 2 , and the focal point of the entire lens system at infinity distance f ∞, when the amount of movement to the magnification position and m 3 from an infinite position of the third lens group, A telephoto macro lens optical system, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002135804A JP4115742B2 (en) | 2002-05-10 | 2002-05-10 | Telephoto macro lens optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002135804A JP4115742B2 (en) | 2002-05-10 | 2002-05-10 | Telephoto macro lens optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003329924A true JP2003329924A (en) | 2003-11-19 |
| JP4115742B2 JP4115742B2 (en) | 2008-07-09 |
Family
ID=29698031
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002135804A Expired - Fee Related JP4115742B2 (en) | 2002-05-10 | 2002-05-10 | Telephoto macro lens optical system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005283719A (en) * | 2004-03-29 | 2005-10-13 | Olympus Corp | Telephoto lens and telephoto lens device |
| JP2006106112A (en) * | 2004-09-30 | 2006-04-20 | Nikon Corp | Interchangeable lens |
| JP2011013357A (en) * | 2009-06-30 | 2011-01-20 | Sigma Corp | Inner focus type macro lens having vibration-proof function |
| JP2011013358A (en) * | 2009-06-30 | 2011-01-20 | Sigma Corp | Inner focus type macro lens having vibration-proof function |
| US8238044B2 (en) | 2009-11-07 | 2012-08-07 | Nikon Corporation | Imaging lens, imaging apparatus, and method for manufacturing imaging lens |
| JP2012189791A (en) * | 2011-03-10 | 2012-10-04 | Olympus Imaging Corp | Lens system and imaging apparatus with the same |
| US9134515B2 (en) | 2010-02-16 | 2015-09-15 | Canon Kabushiki Kaisha | Optical system and optical apparatus |
| EP2362260A4 (en) * | 2008-12-22 | 2017-07-26 | Nikon Corporation | Variable power optical system for stereo microscope |
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2002
- 2002-05-10 JP JP2002135804A patent/JP4115742B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005283719A (en) * | 2004-03-29 | 2005-10-13 | Olympus Corp | Telephoto lens and telephoto lens device |
| JP4563061B2 (en) * | 2004-03-29 | 2010-10-13 | オリンパス株式会社 | Telephoto lens and telephoto lens device |
| JP2006106112A (en) * | 2004-09-30 | 2006-04-20 | Nikon Corp | Interchangeable lens |
| EP2362260A4 (en) * | 2008-12-22 | 2017-07-26 | Nikon Corporation | Variable power optical system for stereo microscope |
| JP2011013357A (en) * | 2009-06-30 | 2011-01-20 | Sigma Corp | Inner focus type macro lens having vibration-proof function |
| JP2011013358A (en) * | 2009-06-30 | 2011-01-20 | Sigma Corp | Inner focus type macro lens having vibration-proof function |
| US8238044B2 (en) | 2009-11-07 | 2012-08-07 | Nikon Corporation | Imaging lens, imaging apparatus, and method for manufacturing imaging lens |
| US9134515B2 (en) | 2010-02-16 | 2015-09-15 | Canon Kabushiki Kaisha | Optical system and optical apparatus |
| JP2012189791A (en) * | 2011-03-10 | 2012-10-04 | Olympus Imaging Corp | Lens system and imaging apparatus with the same |
| US9341830B2 (en) | 2011-03-10 | 2016-05-17 | Olympus Corporation | Lens system and image pickup device equipped with the same |
| US10048474B2 (en) | 2011-03-10 | 2018-08-14 | Olympus Corporation | Lens system and image pickup device equipped with the same |
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| Publication number | Publication date |
|---|---|
| JP4115742B2 (en) | 2008-07-09 |
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