JPH0284614A - Optical system for correcting camera-shake - Google Patents
Optical system for correcting camera-shakeInfo
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- JPH0284614A JPH0284614A JP23740788A JP23740788A JPH0284614A JP H0284614 A JPH0284614 A JP H0284614A JP 23740788 A JP23740788 A JP 23740788A JP 23740788 A JP23740788 A JP 23740788A JP H0284614 A JPH0284614 A JP H0284614A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 38
- 230000004075 alteration Effects 0.000 claims abstract description 30
- 238000003384 imaging method Methods 0.000 claims abstract description 6
- 201000009310 astigmatism Diseases 0.000 claims abstract description 3
- 230000035945 sensitivity Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 102220305346 rs1555469504 Human genes 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
発明の技術分野
本発明はカメラにおいてシャツタ釦を押した時に発生す
る手ブレにより、撮影が失敗するのを防止する技術に関
するものである。DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a technique for preventing failure in photographing due to camera shake that occurs when the shirt button is pressed in a camera.
発明の技術的背景と従来技術
従来の写真撮影の失敗はピンボケと手ブレがその原因の
殆どを占めていた。ところが、近年のカメラにおいては
、オートフォーカスの採用によりピンボケがなくなり、
ピント精度が向上して画質が良くなる一方、企業のコス
トダウンにより望遠系のレンズが安価に供給されるよう
になってきた。Technical Background of the Invention and Prior Art Most failures in conventional photography were caused by out-of-focus and camera shake. However, in recent years, cameras have adopted autofocus, which eliminates out-of-focus images.
While focusing accuracy has improved and image quality has improved, telephoto lenses have become cheaper due to corporate cost reductions.
しかし、望遠系のレンズの普及の結果、手ブレの影響を
受は易くなり、撮影失敗ζ手ブレという関係となり、な
んとか手ブレをなくせないかという要望が強《なってき
た。However, as telephoto lenses have become more widespread, they have become more susceptible to camera shake, leading to failures in photography and camera shake, and there has been a growing demand for ways to eliminate camera shake.
これに対し、従来技術には、カメラ内にブレ検出器を設
け、撮影レンズの焦点距離情報とブレ量に応じて、カメ
ラのシャッタ速度を制御するもの（特開昭５４−５５４
２９，実開昭６１−、１３５３２８）や、カメラ内に加
速度検出手段を設けて、シャツタ開閉動作に応じて、加
速度検出器からの出力により画像にブレが生じたことを
警告するもの（特開昭５８−７０２１７）や結像系の一
部を移動させて、像のブレを補正するものく特開昭６２
−４７０１２）などがあるが補正用の光学系については
何も述べられていない。On the other hand, in the conventional technology, a shake detector is installed inside the camera and the shutter speed of the camera is controlled according to the focal length information of the photographing lens and the amount of shake (Japanese Patent Laid-Open No. 54-554
29, U.S. Pat. 1982-70217) and Japanese Patent Application Laid-Open No. 1986-62, which corrects image blur by moving a part of the imaging system.
-47012), but nothing is mentioned about the optical system for correction.
木允里至亘カ
本発明は手ブレが生じた時に手ブレによる像の移動を補
正し且つその時の光学系全体の収差の劣化が少ないよう
な、手ブレ補正光学系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 camera shake correction optical system that can correct the movement of an image due to camera shake when camera shake occurs, and that reduces the deterioration of aberrations of the entire optical system at that time. shall be.
崖虞ｍ斐
上記目的を達成するために本発明に係る手ブレ補正光学
系は、結像光学系中の一部のレンズを光軸と垂直方向へ
移動させる事により手ブレ等による像のブレを補正する
ものであって、上記光学系の一部のレンズが全レンズの
中で光軸と垂直方向の像の移動に対しては影響が大きい
が他の収差に対しては影響の少ないレンズであると共に
以下の条件式を満足している。In order to achieve the above object, the image stabilization optical system according to the present invention moves some lenses in the imaging optical system in a direction perpendicular to the optical axis to prevent image blur caused by camera shake, etc. A lens in which some lenses in the above optical system have a large effect on image movement in the direction perpendicular to the optical axis among all lenses, but have a small effect on other aberrations. and satisfies the following conditional expression.
■ ０．０８〈１ ｆ／Ｆ１く０．８
但しｒ：補正に用いる光学系中の一部
のレンズの焦点距離
Ｆ：全レンズ系の焦点距離
最大脊効画角の７割の画角の光線に対して、上記補正用
光学系を光軸と垂直方向へ移動させた時の像面での主光
線の変動量に対する諸収差の誤差感度及び軸上光線に対
する誤差感度が以下の条件を満足する事を特徴とする手
ブレ防止レンズ。■ 0.08〈1 f/F1 0.8 However, r: Focal length of some lenses in the optical system used for correction F: Focal length of the entire lens system When the correction optical system is moved in a direction perpendicular to the optical axis, the error sensitivity of various aberrations to the fluctuation amount of the principal ray at the image plane and the error sensitivity to on-axis rays satisfy the following conditions. An anti-shake lens that is characterized by:
■ ０く１ΔＭ ｌ ＜０．５
但し、ΔＭはメリディオナル光線の非
点収差の変動量を像面での主光
線の変動量で規格化したちの
■ ０＜ ｌ ＣＭ ＋ ＜０．１
但し、ＣＭはコマ収差の変動量を像面
での主光線の像面での変動量で
規格化したもの
■Ｏ＜ ｌ ＡＸＣＭ ｌ ＜０．１５但し、ＡＸＣＭ
は軸上コマ収差の変動
量を主光線の像面での変動量で
規格化したものである。■ 0×1ΔM l <0.5 However, ΔM is the amount of variation in astigmatism of the meridional ray normalized by the amount of variation in the principal ray at the image plane ■ 0< l CM + <0.1 However, CM is the amount of variation in comatic aberration normalized by the amount of variation in the principal ray at the image plane ■O < l AXCM l <0.15 However, AXCM
is the amount of variation in axial coma aberration normalized by the amount of variation on the image plane of the principal ray.
以下各条件について説明する。Each condition will be explained below.
まず、補正に用いるレンズは正レンズでも負レンズでも
かまわないが条件■の下限を越えてｒが小さくなるとレ
ンズの移動による収差の変動が大きく性能が劣化する。First, the lens used for correction may be either a positive lens or a negative lens, but if r exceeds the lower limit of condition (2) and becomes small, the aberrations will fluctuate greatly due to lens movement and performance will deteriorate.
また逆に条件■の上限を越えてｆが大きくなると、収差
の変動量は少ないものの像の補正量が少な《、像のブレ
を補正するために補正用レンズをかなりの量、移動させ
なければ効果が得られなくなる。また条件■．■，■は
収差の変動量の許容値を具体的に示したものであり、こ
れ以上の誤差感度を持つレンズ系を補正用レンズ系とし
て用いることはできない。Conversely, if f increases beyond the upper limit of condition (2), the amount of aberration fluctuation is small, but the amount of image correction is small. The effect will no longer be obtained. Also, the condition ■． (2) and (2) specifically indicate the permissible value of the amount of variation in aberration, and a lens system having greater error sensitivity than this cannot be used as a correction lens system.
以上に加えて更に望ましい条件としてレンズ系の前群は
、外径が大きくレンズ重量も重いため、補正用光学系と
して移動させるには適さない。そこで条件■は、大きく
重いレンズの前群をさけるための条件である。補正用レ
ンズの形状としては、面の曲率中心がレンズ系全体の結
像点となるような面をもつ方が、光線に対してずなおで
あるため収差の変動が少ないと思われるが、そういう面
を持たない場合でも、補正用レンズの前面と後面で互い
に収差の変動を打ち消すような形状であれば特に問題は
ない。In addition to the above, a further desirable condition is that the front group of the lens system has a large outer diameter and a heavy lens weight, so it is not suitable to be moved as a correction optical system. Therefore, condition (2) is a condition for avoiding the front group of a large and heavy lens. Regarding the shape of the correction lens, it would be better to have a surface where the center of curvature of the surface becomes the imaging point of the entire lens system, since it is square to the light rays, so there will be less variation in aberrations. Even if the correction lens does not have a surface, there is no particular problem as long as the front and rear surfaces of the correction lens have a shape that mutually cancels out fluctuations in aberrations.
日にづ 以下、実施例に基づいて本発明を説明する。day by day Hereinafter, the present invention will be explained based on Examples.
〈実施例１〉
第１図は後述する表１の構成を有する、前群が正のパワ
ーをもち後群が負のパワーをもつ望遠タイプのレンズ系
を示す実施例１の光学系の断面図であるが、この光学系
の個々のレンズを平行偏心させた時の諸収差（軸外光ｙ
’ ＝１５）の変動量を像面での像高の移動量で規格化
したものが（表２）である、つまりこれは像面で手ブレ
に対する補正を行う時の各レンズの誤差感度を表にした
ものである。<Example 1> Fig. 1 is a cross-sectional view of an optical system of Example 1, showing a telephoto type lens system in which the front group has positive power and the rear group has negative power, having the configuration shown in Table 1 described later. However, various aberrations (off-axis light y
' = 15) normalized by the amount of movement of the image height on the image plane is (Table 2).In other words, this is the error sensitivity of each lens when correcting for camera shake on the image plane. This is a table.
この表から判断すると０３． Ｇ５． Ｇ３の各レンズ
が他のレンズに比べて収差の変動量が少ないが、鏡胴の
構成上から考えると６３レンズは前群の一部であるため
外径がＤ−９３，５もあり、レンズの重量が重（、移動
させるのには適さない。そこで後群内の０５． Ｇ８の
どちらかを選択することになるが、ここで各レンズにつ
いて各々のレンズを１ｍｍ平行偏心させた時の像面での
光線のズレ量を（表３）に示す。この表で見ると０５．
Ｇ８で約２倍のズレ量の差がある。そこで、その差に
注目しレンズの駆動機構の特性により、どちらかを選べ
ば良い、つまり、補正用のレンズに対して少ない移動量
しか与えられないような駆動機構であればＧ８を用いれ
ばよいし、充分な移動量を与えることができる駆動機構
であれば、Ｇ５を使用すればよい。Judging from this table, 03. G5. Each lens in the G3 has less variation in aberration than other lenses, but considering the structure of the lens barrel, the 63 lens is part of the front group, so its outer diameter is D-93. The weight of the lens is heavy (and it is not suitable for moving. Therefore, we will choose either the 05. The amount of deviation of the light beam on the surface is shown in (Table 3). Looking at this table, it is 0.5.
There is a difference of about twice the amount of deviation in G8. Therefore, you should pay attention to the difference and choose one depending on the characteristics of the lens drive mechanism. In other words, if the drive mechanism can only give a small amount of movement to the correction lens, G8 should be used. However, G5 may be used as long as it is a drive mechanism that can provide a sufficient amount of movement.
また、その他に鏡胴構成上から考えると、フォーカシン
グブロックなどの移動群中にあるレンズを補正に用いる
と移動機構と補正機構を二重にする必要があるため固定
群中のレンズを選択する方が、機構的により簡単にでき
るため有利であると言える。In addition, considering the lens barrel configuration, if a lens in a moving group such as a focusing block is used for correction, it is necessary to double the moving mechanism and correction mechanism, so it is better to select a lens in a fixed group. However, it can be said to be advantageous because it is mechanically simpler.
また、本実施例では移動させるレンズは１つしか示して
いないが、２個あるいはそれ以上のレンズを組み合わせ
ることも可能である。Further, although only one lens to be moved is shown in this embodiment, it is also possible to combine two or more lenses.
−炎上−
ｆ＝２９５．０ ＦＮＯ＝２．９１ Ｇｓ／ Ｆ
Ｉ ＝０．９０
Ｇ、／Ｆ ｌ −０，６５
１ｃｓ／ Ｆ ｌ ＝０．２６
ｄｏｓ ２．０００
〈実施例２〉
第２図は本発明を表４の構成を有する１００〜３００ｎ
ｍ／４．５〜５．６のズームレンズの最長焦点距離状態
に用いた場合の実施例の光学系の断面図である。この場
合も実施例１と同様に各レンズを平行偏心させた時の諸
収差（軸外光ｙ’ ＝１５）の変動量を像面での像高の
移動量で規格化したものが（表５）である。-Flame- f=295.0 FNO=2.91 Gs/F
I =0.90 G, /F l -0,65 1 cs/ F l =0.26 dos 2.000 <Example 2>
FIG. 3 is a cross-sectional view of an optical system according to an embodiment when a zoom lens of m/4.5 to 5.6 is used in the longest focal length state. In this case, as in Example 1, the amount of variation in various aberrations (off-axis light y' = 15) when each lens is parallel decentered is normalized by the amount of movement of the image height on the image plane (Table 1). 5).
（表５）より判断すると収差の変動量が少ないのは、接
合レンズＧｌｌ Ｇ！＋ Ｇ？＋ Ｇ１１ の各レンズ
が他のレンズに比べて収差の変動量が少ないが、接合レ
ンズＧ、、 Ｇ２はレンズ系の前群であるためＧ、の外
径はＤ ＝５２．５． Ｇ２の外径はＤ ＝５１．０と
なりレンズ重量が重く移動させるには適さない。そこで
、Ｇ。Judging from Table 5, the cemented lens Gll G! has the smallest amount of variation in aberration. +G? + G11 each lens has a smaller amount of variation in aberration than the other lenses, but since the cemented lenses G, and G2 are the front group of the lens system, the outer diameter of G is D = 52.5. The outer diameter of G2 is D = 51.0, which makes the lens heavy and unsuitable for movement. So, G.
Ｇ１１のどちらかを選択することになるが、ここで各レ
ンズを１ｆｆｌＩ１１平行偏心させた時の像面での光線
のズレ量を（表６）に示す。この表で見ると、Ｇ？＋Ｇ
、のズレ量の差は約２倍程度である。そこで、この場合
も実施例１と同様にレンズ駆動機構の特性と、鏡胴構成
の両方から見て容易な方を選択すれば良い。つまり、実
施例１と同様に、補正レンズ系を多く動かせない場合は
Ｇ、を用いれば補正レンズを多く移動させなくても像面
での補正量は充分かせげる。また補正光学系に対して微
小な位置制御ができない場合はＧ、を選択した方が補正
光学系の位置誤差が像面により効かないのでＧ、に比べ
て比較的有利である。G11 will be selected, and Table 6 shows the amount of deviation of the light beam on the image plane when each lens is parallel decentered by 1fflI11. Looking at this table, G? +G
, the difference in the amount of deviation is about twice as much. Therefore, in this case, as in the first embodiment, the one that is easier from the viewpoint of both the characteristics of the lens drive mechanism and the lens barrel configuration may be selected. That is, as in the first embodiment, if the correction lens system cannot be moved much, by using G, a sufficient amount of correction on the image plane can be obtained without moving the correction lens much. Furthermore, if minute positional control is not possible for the correction optical system, selecting G is relatively advantageous compared to G because the positional error of the correction optical system is less effective on the image plane.
補正光学系の補正量をΔＴ、像面での像のズレ量をＴと
すると
０くＴ／ΔＴ≦１．０
の場合は、補正光学系のスペースが広く取れる場合や、
補正光学系の位置制御が困難な場合に適しており
１．０＜Ｔ／ΔＴ
の場合は、補正光学系の移動スペースが広く取れない場
合や、高精度の位置制御が可能な場合に適している。If the correction amount of the correction optical system is ΔT, and the amount of image shift on the image plane is T, then T/ΔT≦1.0 means that a large space can be used for the correction optical system, or
Suitable when it is difficult to control the position of the correction optical system. If 1.0<T/ΔT, it is suitable when a large movement space for the correction optical system cannot be secured or when highly accurate position control is possible. There is.
ｆ ＝２９２．０（最長焦点距離状態）Ｆ、、＝５．（
ｉ典皇生径 槓上皿皿蓋 皿立圭 ヱヱ丘撤−ｒ
、 ７６．６２５
Ｇ＋／ Ｆ Ｉｌ ＝０．６６ ｌ ｈ／ Ｆ
＋ ｌ −０，３４ＧＶ／Ｆ、ｌ＝０．２７ １Ｇ＋
１／Ｆ１１＝０．１１５但しＦｌはテレ端での焦点距離
次に、第３図〜第８図は実施例１における収差図であり
、そのうちの第３図及び第４図は偏心前のメリジオナル
光線及びサジタル光線によるガウス面上の横収差を示し
ている。第５図及び第６図はＧＳのレンズを１．０ ｔ
ｍ平行偏心させたときのメリジオナル光線とサジタル光
線によるガウス面上の横収差を示し、第７図と第８図は
Ｇ、のレンズを１゜０ｍｍ平行偏心させたときの同様な
横収差を表わしている。f = 292.0 (longest focal length state) F, , = 5. (
i-ten-o-sei-dou, plate-on-plate, plate-lid, plate-standing Kei,
, 76.625 G+/F Il =0.66 l h/F
+ l −0,34GV/F, l=0.27 1G+
1/F11=0.115, where Fl is the focal length at the telephoto end. Figures 3 to 8 are aberration diagrams in Example 1, of which Figures 3 and 4 are meridional before eccentricity. It shows the transverse aberration on the Gaussian plane due to the rays and sagittal rays. Figures 5 and 6 show the GS lens at 1.0 t.
The transverse aberration on the Gaussian surface due to the meridional ray and the sagittal ray when the lens is eccentrically eccentric by m is shown. Figures 7 and 8 show the similar transverse aberration when the lens G is eccentrically eccentric by 1°0mm. ing.
実施例２については第９図〜第１４図で示しており、第
９図と第１０図は偏心前におけるメリジオナル光線とサ
ジタル光線によるガウス面上の横収差を示し、第１１図
と第１２図はＧ、のレンズを１．０ ｍ平行偏心させた
場合のメリジオナル光線とサジタル光線によるガウス面
上の横収差を示し、第１３図と第１４図はＧｌｌのレン
ズを１．０ ｍ平行偏心させたときの同様な横収差を表
わしている。Example 2 is shown in FIGS. 9 to 14, and FIGS. 9 and 10 show the lateral aberration on the Gaussian plane due to meridional rays and sagittal rays before eccentricity, and FIGS. 11 and 12. shows the transverse aberration on the Gaussian plane due to meridional rays and sagittal rays when the lens G is parallel decentered by 1.0 m, and Figures 13 and 14 show the transverse aberration on the Gaussian surface when the lens Gll is parallel decentered 1.0 m. This shows similar lateral aberrations when
第１図及び第２図はそれぞれ実施例１と実施例２のレン
ズ構成図であり、第３図、第４図、第５図、第６図、第
７図及び第８図はその実施例１の収差図、そして第９図
、第１０図、第１１図、第１２図。
第１３図及び第１４図は実施例２の収差図である。
出 願 人 ミノルタカメラ株式会社Figures 1 and 2 are lens configuration diagrams of Example 1 and Example 2, respectively, and Figures 3, 4, 5, 6, 7, and 8 are examples of the lenses. 1, and FIGS. 9, 10, 11, and 12. FIG. 13 and FIG. 14 are aberration diagrams of Example 2. Applicant Minolta Camera Co., Ltd.
Claims (5)
移動させる事により手ブレ等による像のブレを補正する
手ブレ補正光学系において、上記一部のレンズは全レン
ズの中で光軸と垂直方向の像の移動に対しては、影響が
大きいが他の収差に対しては影響の少ないレンズである
こと及び以下の条件を満足することを特徴とする手ブレ
補正光学系。 ０．０８＜｜ｆ／Ｆ｜＜０．８ 但しｆ：補正に用いる光学系中の一部のレンズの焦点距
離 Ｆ：全レンズ系の焦点距離 最大有効画角の７割の画角の光線に対して上記補正用光
学系を光軸と垂直方向へ移動させた時の像面での主光線
の変動量に対する諸収差の誤差感度及び軸上構成に対す
る誤差感度が以下の条件を満足する。 ０＜｜ΔＭ｜＜０．５ 但し、ΔＭはメリディオナル光線の非点収差の変動量を
像面での主光線の変動量で規格化したもの ０＜｜ＣＭ｜＜０．１ 但し、ＣＭはコマ収差の変動量を像面での主光線の像面
での変動量で規格化したもの ０＜｜ＡＸＣＭ｜＜０．１５ 但し、ＡＸＣＭは軸上コマ収差の変動量を主光線の像面
での変動量で規格化したものである。(1) In an image stabilization optical system that corrects image blur caused by camera shake by moving some of the lenses in the imaging optical system in a direction perpendicular to the optical axis, some of the lenses mentioned above are Image stabilization optics characterized by being a lens that has a large effect on image movement in the direction perpendicular to the optical axis but has little effect on other aberrations, and that satisfies the following conditions: system. 0.08<|f/F|<0.8 However, f: Focal length of some lenses in the optical system used for correction F: Focal length of all lens systems Light rays with an angle of view that is 70% of the maximum effective angle of view In contrast, when the correction optical system is moved in a direction perpendicular to the optical axis, the error sensitivity of various aberrations to the fluctuation amount of the principal ray on the image plane and the error sensitivity to the on-axis configuration satisfy the following conditions. 0<|ΔM|<0.5 However, ΔM is the amount of variation in astigmatism of the meridional ray normalized by the amount of variation in the principal ray at the image plane0<|CM|<0.1 However, CM is The amount of variation in comatic aberration is normalized by the amount of variation on the image plane of the principal ray at the image plane. 0<|AXCM|<0.15 It is normalized by the amount of variation in .
徴とする第１請求項に記載の手ブレ補正光学系。 Ｆ／Ｆ＿Ｎ＿Ｏ×０．７５≧Ｄ 但しＤ：補正用光学系の外径 Ｆ＿Ｎ＿Ｏ：結像系全体のＦナンバー(2) The camera shake correction optical system according to claim 1, wherein the lens further satisfies the following conditions. F/F_N_O×0.75≧D However, D: Outer diameter of the correction optical system F_N_O: F number of the entire imaging system
する第１請求項に記載の手ブレ補正光学系。(3) The camera shake correction optical system according to claim 1, wherein the lens is a part of a fixed group.
を特徴とする第１請求項に記載の手ブレ補正光学系。(4) The camera shake correction optical system according to claim 1, wherein the lens is a single lens or a cemented lens.
を少くとも１面持つことを特徴とする第１請求項に記載
の手ブレ補正光学系。(5) The camera shake correction optical system according to claim 1, wherein the lens has at least one surface whose center of curvature is near the image plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23740788A JPH0284614A (en) | 1988-09-21 | 1988-09-21 | Optical system for correcting camera-shake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23740788A JPH0284614A (en) | 1988-09-21 | 1988-09-21 | Optical system for correcting camera-shake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0284614A true JPH0284614A (en) | 1990-03-26 |
Family
ID=17014928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23740788A Pending JPH0284614A (en) | 1988-09-21 | 1988-09-21 | Optical system for correcting camera-shake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0284614A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011197413A (en) * | 2010-03-19 | 2011-10-06 | Nikon Corp | Photographic lens, optical apparatus having the photographic lens, and method for manufacturing the photographic lens |
| JP2013246354A (en) * | 2012-05-28 | 2013-12-09 | Sigma Corp | Imaging optical system |
-
1988
- 1988-09-21 JP JP23740788A patent/JPH0284614A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011197413A (en) * | 2010-03-19 | 2011-10-06 | Nikon Corp | Photographic lens, optical apparatus having the photographic lens, and method for manufacturing the photographic lens |
| JP2013246354A (en) * | 2012-05-28 | 2013-12-09 | Sigma Corp | Imaging optical system |
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