JP2013195747A5 - - Google Patents
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- JP2013195747A5 JP2013195747A5 JP2012063354A JP2012063354A JP2013195747A5 JP 2013195747 A5 JP2013195747 A5 JP 2013195747A5 JP 2012063354 A JP2012063354 A JP 2012063354A JP 2012063354 A JP2012063354 A JP 2012063354A JP 2013195747 A5 JP2013195747 A5 JP 2013195747A5
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Description
このためレトロフォーカス型の光学系では、広画角化を図りつつ、色収差と、球面収差、コマ収差、非点収差などの諸収差をバランス良く補正することが困難である。レトロフォーカス型の光学系において、色収差と球面収差、コマ収差、非点収差等の諸収差とをバランス良く補正するには、特に開口絞りよりも像側の正の屈折力の後方レンズ群のレンズ構
成を適切に設定することが重要となってくる。
Therefore, it is difficult for a retrofocus optical system to correct chromatic aberration and various aberrations such as spherical aberration, coma aberration, and astigmatism in a well-balanced manner while achieving a wide angle of view. In the retrofocus type optical system, chromatic and spherical aberration, coma, and aberrations in a good balance correction of such astigmatism, in particular the image side of the Ri aperture opening of the positive refractive power of the rear lens group It is important to set the lens configuration appropriately.
本発明の光学系は、物体側より像側へ順に、第１レンズ群、開口絞り、正の屈折力の第２レンズ群からなり、
最も物体側のレンズ面を通過する近軸軸上光線の光軸からの高さが、光軸と瞳近軸光線との交点より像側において近軸軸上光線がレンズ面を通過する光軸からの高さの最大値よりも小さい光学系であって、
前記第２レンズ群は、正レンズＡと正レンズＢを有し、前記正レンズＡの材料のアッベ数と部分分散比を各々νｄｐＡ、θｇＦｐＡ、前記正レンズＢの材料のアッベ数と部分分散比を各々νｄｐＢ、θｇＦｐＢとするとき、
１７＜νｄｐＡ＜２５
０．０２＜θｇＦｐＡ−０．６４３８＋０．００１６８２×νｄｐＡ＜０．０５
６０＜νｄｐＢ＜１００
０．００１＜θｇＦｐＢ−０．６４３８＋０．００１６８２×νｄｐＢ＜０．０６０
なる条件式を満足することを特徴としている。
The optical system of the present invention includes, in order from the object side to the image side, a first lens group, an aperture stop, and a second lens group having a positive refractive power.
The height from the optical axis of the paraxial light beam that passes through the lens surface closest to the object is the optical axis through which the paraxial light beam passes through the lens surface on the image side from the intersection of the optical axis and pupil paraxial light beam. a smaller optics than the maximum value of the height from,
The second lens group has a positive lens A and a positive lens B, wherein each material Abbe numbers and parts partial dispersion ratio of the positive lens A νdpA, θgFpA, Abbe number of the positive lens B materials and parts min When the dispersion ratios are νdpB and θgFpB, respectively.
17 <νdpA <25
0.02 <θgFpA−0.6438 + 0.001682 × νdpA <0.05
60 <νdpB <100
0.001 <θgFpB−0.6438 + 0.001682 × νdpB <0.060
It satisfies the following conditional expression.
以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。本発明の光学系は、物体側より像側へ順に、第１レンズ群、開口絞り、正の屈折力の第２レンズ群を有している。また、本発明の光学系は最も物体側のレンズ面を通過する近軸軸上光線の光軸からの高さが、光軸と瞳近軸光線との交点Ｐより像側で近軸軸上光線がレンズ面を通過する光軸からの高さの最大値よりも小さいレトロフォーカス型より成っている。なお、近軸軸上光線とは、光学系全系の焦点距離を１に正規化したとき、光学系の光軸と平行に、光軸からの高さを１として入射させた近軸光線である。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The optical system of the present invention includes, in order from the object side to the image side, a first lens group, an aperture stop, and a second lens group having a positive refractive power. In the optical system of the present invention, the height from the optical axis of the paraxial ray passing through the lens surface closest to the object side is on the paraxial axis on the image side from the intersection P between the optical axis and the pupil paraxial ray. It consists of a retrofocus type that is smaller than the maximum height from the optical axis through which the light beam passes the lens surface. Note that the paraxial light beam is a paraxial light beam that is incident with the height from the optical axis set to 1 in parallel with the optical axis of the optical system when the focal length of the entire optical system is normalized to 1. is there.
図１は、本発明の光学系の実施例１のレンズ断面図、図２は実施例１の光学系の無限合焦状態の収差図である。図３は、本発明の光学系の実施例２のレンズ断面図、図４は実施例２の光学系の無限合焦状態の収差図である。図５は、本発明の光学系の実施例３のレンズ断面図、図６は実施例３の光学系の無限合焦状態の収差図である。図７は本発明の撮像装置の要部概略図である。 FIG. 1 is a lens cross-sectional view of Example 1 of the optical system of the present invention, and FIG. 2 is an aberration diagram of the optical system of Example 1 in an infinitely focused state. 3 is a lens cross-sectional view of Example 2 of the optical system of the present invention, and FIG. 4 is an aberration diagram of the optical system of Example 2 in an infinitely focused state. FIG. 5 is a lens cross-sectional view of Example 3 of the optical system of the present invention, and FIG. 6 is an aberration diagram of the optical system of Example 3 in an infinitely focused state. FIG. 7 is a schematic view of the main part of the imaging apparatus of the present invention.
レンズ断面図において、ＬＡは光学系である。光学系ＬＡは開口絞りＳＰを挟んで物体側に負の屈折力の第１レンズ群Ｌ１と像側に正の屈折力の第２レンズ群Ｌ２を有している。ＬＦはフォーカシングに際して移動するフォーカスレンズ群である。フォーカスレンズ群ＬＦは第１レンズ群Ｌ１の一部と第２レンズ群Ｌ２より構成されている。フォーカスレンズ群ＬＦは無限遠物体から近距離物体へのフォーカシングに際して矢印の如く物体側へ移動する。 In the lens cross-sectional view, LA is an optical system. The optical system LA has a first lens unit L1 having negative refractive power on the object side and a second lens unit L2 having positive refractive power on the image side with the aperture stop SP interposed therebetween. LF is a focus lens group that moves during focusing. The focus lens group LF is composed of a part and a second lens group L2 in the first lens unit L1. The focus lens unit LF moves to the object side as indicated by an arrow during focusing from an infinitely distant object to a close object.
各実施例の光学系において、第２レンズ群Ｌ２は２つ以上の正の屈折力のレンズ（以下「正レンズ」という。）を有している。２つ以上の正レンズのうちの１つの正レンズを正レンズＡ、他の１つの正レンズを正レンズＢとする。正レンズＡの材料のアッベ数と、部分分散比を各々νｄｐＡ、θｇＦｐＡ、正レンズＢの材料のアッベ数と、部分分散比を各々νｄｐＢ、θｇＦｐＢとする。 In the optical system of each embodiment, the second lens unit L2 includes two or more lenses having a positive refractive power (hereinafter referred to as “positive lenses”). One of the two or more positive lenses is a positive lens A, and the other positive lens is a positive lens B. The Abbe number and partial dispersion ratio of the material of the positive lens A are νdpA and θgFpA, respectively. The Abbe number of the material of the positive lens B and the partial dispersion ratio are νdpB and θgFpB, respectively.
条件式（１ａ）、（１ｂ）、（２ａ）、（２ｂ）は第２レンズ群Ｌ２内の正レンズＡと正レンズＢの材料のアッベ数と異常分散を適切に設定することでレンズ系全体の色収差を良好に補正するための条件である。高分散の異常分散硝材が色収差の補正の分担をすることで、レンズの屈折力の増加を抑え色収差とその他の諸収差の補正を容易にしている。条件式（１ａ）、（１ｂ）、（２ａ）、（２ｂ）を同時に満足することによって光学系全体で諸収差の悪化を軽減しつつ、色収差を良好に補正している。 Conditional expressions (1a), (1b), (2a), and (2b) are obtained by appropriately setting the Abbe number and anomalous dispersion of the materials of the positive lens A and the positive lens B in the second lens unit L2. This is a condition for satisfactorily correcting the chromatic aberration. The high dispersion anomalous dispersion glass material shares the correction of chromatic aberration, thereby suppressing the increase of the refractive power of the lens and facilitating correction of chromatic aberration and other various aberrations. By satisfying the conditional expressions (1a), (1b), (2a), and (2b) at the same time, the chromatic aberration is corrected well while reducing the deterioration of various aberrations in the entire optical system.
各実施例では高分散、高屈折率の材料よりなる正レンズＡを第２レンズ群Ｌ２中の最も像側に配置することで、諸収差の発生を抑えつつ倍率色収差の２次スペクトルの曲がりの補正を効果的に行っている。また、バックフォーカスを長くすることを容易にしている。実施例１、２、３においては正レンズＡが条件式（１ａ）、（１ｂ）を満足する。実施例１においては２つのレンズＢ1、Ｂ2、実施例２においては１つのレンズＢ1、実施例３においては１つのレンズＢ1が条件式（２ａ）、（２ｂ）を満足する正レンズＢに相当している。 In each embodiment, the positive lens A made of a material having a high dispersion and a high refractive index is arranged on the most image side in the second lens unit L2, thereby suppressing the occurrence of various aberrations and bending of the secondary spectrum of lateral chromatic aberration. The correction is performed effectively. In addition, it is easy to increase the back focus. In Examples 1, 2, and 3, the positive lens A satisfies the conditional expressions (1a) and (1b). In the first embodiment, two lenses B1 and B2, one lens B1 in the second embodiment, and one lens B1 in the third embodiment correspond to the positive lens B that satisfies the conditional expressions (2a) and (2b). ing.
また、低分散の材料よりなる正レンズＢを実施例１においては２つ、実施例２と実施例３においては各１つ、第２レンズ群Ｌ２中に配置することで正レンズＡとの分散のバランスをとり、第２レンズ群Ｌ２において色収差を良好に補正している。 The two in the embodiment 1 of the positive lens B consisting of the low-dispersion material, each one in Examples 2 and 3, the dispersion of the positive lens A by placing in the second lens group L2 Thus, the chromatic aberration is corrected well in the second lens unit L2.
条件式（１ａ）、（２ａ）の下限を超えて正レンズＡと正レンズＢの材料の分散が大きくなりすぎると、色収差が過補正となりよくない。条件式（１ａ）、（２ａ）の上限を超えて正レンズＡと正レンズＢの材料の分散が小さくなりすぎると、色収差の補正効果が小さくなりよくない。もしくは同等の効果を得るために各レンズのパワーを増加させなければならなくなり諸収差の良好な補正が困難となる。より好ましくは、条件式（１ａ）、（１ｂ）、（２ａ）、（２ｂ）の数値範囲を次の如く設定するのがよい。
１８＜νｄｐＡ＜２４ ・・・（１ａａ）
０．０２２＜θｇＦｐＡ−０．６４３８＋０．００１６８２×νｄｐＡ＜０．０４０
・・・（１ｂｂ）
６３＜νｄｐＢ＜９６ ・・・（２ａａ）
０．０１２＜θｇＦｐＢ−０．６４３８＋０．００１６８２×νｄｐＢ＜０．０５２
・・・（２ｂｂ）
各実施例では以上のように構成することにより広画角でありながら色収差を良好に補正し、高い光学性能を有した光学系を得ている。各実施例において更に好ましくは次の諸条件のうち１以上を満足するのが良い。正レンズＡの焦点距離をｆｐＡ、正レンズＢの焦点距離をｆｐＢ、全系の焦点距離をｆとする。
If the dispersion of the materials of the positive lens A and the positive lens B becomes too large beyond the lower limits of the conditional expressions (1a) and (2a), chromatic aberration is not overcorrected. If the dispersion of the materials of the positive lens A and the positive lens B becomes too small beyond the upper limits of the conditional expressions (1a) and (2a), the correction effect of chromatic aberration is not likely to be small. Or, in order to obtain an equivalent effect, the power of each lens must be increased, and it is difficult to correct various aberrations. More preferably, the numerical ranges of the conditional expressions (1a), (1b), (2a), and (2b) are set as follows.
18 <νdpA <24 (1aa)
0.022 <θgFpA−0.6438 + 0.001682 × νdpA <0.040
... (1bb)
63 <νdpB <96 (2aa)
0.012 <θgFpB−0.6438 + 0.001682 × νdpB <0.052
... (2bb)
In each embodiment, by configuring as described above, chromatic aberration is corrected well with a wide angle of view, and an optical system having high optical performance is obtained. In each embodiment, it is more preferable to satisfy one or more of the following conditions. The focal length of the positive lens A is fpA, the focal length of the positive lens B is fpB, and the focal length of the entire system is f.
第１レンズ群Ｌ１は物体側から像側へ順に、連続して配置された２枚以上の負レンズを有している。そして連続した２つ以上の負レンズのうち、１つの負レンズを負レンズＣとし、負レンズＣの材料のアッベ数と部分分散比を各々νｄｎＣ、θｇＦｎＣとする。負レンズＣの焦点距離をｆｎＣとする。 The first lens unit L1 includes two or more negative lenses that are sequentially arranged from the object side to the image side. Of the two or more consecutive negative lenses, one negative lens is a negative lens C, and the Abbe number and partial dispersion ratio of the material of the negative lens C are νdnC and θgFnC, respectively. Let the focal length of the negative lens C be fnC.
このとき、次の条件式のうち１以上を満足するのが良い。
２０＜νｄｐＡ×ｆｐＡ／ｆ＜７０ ・・・（３）
１．２＜（νｄｐＢ×ｆｐＢ）／（νｄｐＡ×ｆｐＡ）＜６．０ ・・・（４）
２＜｜（νｄｎＣ×ｆｎＣ）／（νｄｐＡ×ｆｐＡ）｜＜１４ ・・・（５ａ）
０．００１＜θｇＦｎＣ−０．６４３８＋０．００１６８２×νｄｎＣ＜０．０６０
・・・（５ｂ）
次に前述した各条件式の技術的意味について説明する。条件式（３）は正レンズＡの材料のアッベ数と焦点距離に関し、正レンズＡの色消しの強さを適切に設定することで色収差を良好に補正するための条件である。条件式（３）の下限を超えると正レンズＡの色消しが強くなりすぎて、色収差が過補正となりよくない。
At this time, it is preferable to satisfy one or more of the following conditional expressions.
20 <νdpA × fpA / f <70 (3)
1.2 <(νdpB × fpB) / (νdpA × fpA) <6.0 (4)
2 <| (νdnC × fnC) / (νdpA × fpA) | <14 (5a)
0.001 <θgFnC−0.6438 + 0.001682 × νdnC <0.060
... (5b)
Next, the technical meaning of each conditional expression described above will be described. Condition (3) relates to the Abbe number and the focal length of the positive lens A material, the strength of the achromatic positive lens A by appropriately setting a condition for well correcting chromatic aberration. When the lower limit of conditional expression (3) is exceeded, the achromaticity of the positive lens A becomes too strong, and chromatic aberration is not overcorrected.
もしくは正の屈折力の第２レンズ群Ｌ２全体の過補正を防ぐために第２レンズ群Ｌ２中の負レンズに正レンズＡと同程度以上の高分散な材料を用いる必要がある。一般的に高分散材料は部分分散比θｇＦも大きくなるため、正レンズＡの色消し効果を打ち消してしまいよくない。 Alternatively, in order to prevent overcorrection of the entire second lens unit L2 having a positive refractive power, it is necessary to use a highly dispersed material that is equal to or higher than the positive lens A for the negative lens in the second lens unit L2. In general, a high dispersion material has a large partial dispersion ratio θgF, which is not good for canceling the achromatic effect of the positive lens A.
条件式（３）の上限を超えると正レンズＡの色消しが弱くなりすぎて、良好な色収差の補正が困難となるためよくない。より好ましくは条件式（３）の数値範囲を次の如く設定するのがよい。
２５＜νｄｐＡ×ｆｐＡ／ｆ＜６０ ・・・（３ａ）
If the upper limit of conditional expression (3) is exceeded, the achromaticity of the positive lens A becomes too weak, and it is difficult to correct chromatic aberration, which is not good. More preferably, the numerical range of conditional expression (3) is set as follows.
25 <νdpA × fpA / f <60 (3a)
条件式（４）は正レンズＡと正レンズＢの色消しの強さの比に関し、色消しの強さのバランスを適切に設定することで色収差を良好に補正するための条件である。条件式（４）の下限を超えると正レンズＡの色消しが強くなりすぎて、２次スペクトルの曲がりに対する補正効果は大きくなるが、１次の色収差が過補正となりよくない。条件式（４）の上限を超えると正レンズＢの色消しが強くなりすぎて、低分散な硝材で強い色消しをすることになるためにレンズの屈折力を増加しなければならず、色以外の諸収差が悪化するためよくない。 Conditional expression (4) relates to the ratio of the achromatic intensity between the positive lens A and the positive lens B, and is a condition for correcting chromatic aberration satisfactorily by appropriately setting the achromatic intensity balance. If the lower limit of the conditional expression (4) is exceeded, the achromaticity of the positive lens A becomes too strong, and the correction effect for the curvature of the secondary spectrum becomes large, but the primary chromatic aberration is not overcorrected. If the upper limit of conditional expression (4) is exceeded, the achromaticity of the positive lens B becomes too strong, and the achromaticity of the positive lens B will be strongly achromatic, so the refractive power of the lens must be increased. Various aberrations other than that are not good.
より好ましくは、条件式（４）の数値範囲を次の如く設定するのがよい。
１．５＜（νｄｐＢ×ｆｐＢ）／（νｄｐＡ×ｆｐＡ）＜５．０
・・・（４ａ）
条件式（５ａ）は正レンズＡと負レンズＣの色消しの強さの比に関し、色消しの強さのバランスを適切に設定することで倍率色収差を良好に補正するための条件である。条件式（５ａ）の下限を超えると負レンズＣの色消しが強くなりすぎて、特に１次の倍率色収差が過補正となりよくない。条件式（５ａ）の上限を超えると負レンズＣの色消しが弱くなりすぎて、物体側のレンズの屈折力を下げなければならず、物体側のレンズの有効径（前玉有効径）が大型化するためよくない。
More preferably, the numerical range of conditional expression (4) is set as follows.
1.5 <(νdpB × fpB) / (νdpA × fpA) <5.0
... (4a)
Conditional expression (5a) relates to the ratio of the achromatic intensity of the positive lens A and the negative lens C, and is a condition for properly correcting the lateral chromatic aberration by appropriately setting the balance of the achromatic intensity. If the lower limit of conditional expression (5a) is exceeded, the achromaticity of the negative lens C becomes too strong, and in particular primary chromatic aberration of magnification is not overcorrected. If the upper limit of conditional expression (5a) is exceeded, the achromaticity of the negative lens C becomes too weak, and the refractive power of the object side lens must be lowered, and the effective diameter of the object side lens (front lens effective diameter) is It is not good because it is large.
より好ましくは条件式（５ａ）の数値範囲を次の如く設定するのがよい。
３＜｜（νｄｐＣ×ｆｐＣ）／（νｄｐＡ×ｆｐＡ）｜＜１３・・・（５ａａ）
条件式（５ｂ）は負レンズＣの材料の部分分散比に関し、倍率色収差の２次スペクトルの曲がりを良好に補正するための条件である。また、実施例１においては３つのレンズＣ1、Ｃ2、Ｃ3、実施例２においては１つのレンズＣ1、実施例３においては２つのレンズＣ1、Ｃ2が条件式（５ａ）、（５ｂ）を満たす負レンズＣに相当する。これらの負レンズを配置することで効果的に倍率色収差の補正を行っている。
More preferably, the numerical range of conditional expression (5a) should be set as follows.
3 <| (νdpC × fpC) / (νdpA × fpA) | <13 (5aa)
Conditional expression (5b) relates to the partial dispersion ratio of the material of the negative lens C, and is a condition for satisfactorily correcting the bending of the secondary spectrum of lateral chromatic aberration. In Example 1, three lenses C 1 , C 2 , C 3 , in Example 2, one lens C 1 , and in Example 3, two lenses C 1 , C 2 are conditional expressions (5a), This corresponds to the negative lens C satisfying (5b). By arranging these negative lenses, the lateral chromatic aberration is effectively corrected.
図７は各実施例の光学系を用いたデジタルスチルカメラの要部概略図である。図７において２０はカメラ本体、２１は各実施例で説明したいずれかの光学系によって構成された撮影光学系である。２２はカメラ本体２０に内蔵され、撮影光学系２１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（撮像素子）（光電変換素子）である。 FIG. 7 is a schematic diagram of a main part of a digital still camera using the optical system of each embodiment. In FIG. 7, reference numeral 20 denotes a camera body, and 21 denotes a photographing optical system constituted by any one of the optical systems described in each embodiment. Reference numeral 22 denotes a solid-state imaging device (imaging device) (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the photographing optical system 21 and is built in the camera body 20.
Claims (8)
最も物体側のレンズ面を通過する近軸軸上光線の光軸からの高さが、光軸と瞳近軸光線との交点より像側において近軸軸上光線がレンズ面を通過する光軸からの高さの最大値よりも小さい光学系であって、
前記第２レンズ群は、正レンズＡと正レンズＢを有し、前記正レンズＡの材料のアッベ数と部分分散比を各々νｄｐＡ、θｇＦｐＡ、前記正レンズＢの材料のアッベ数と部分分散比を各々νｄｐＢ、θｇＦｐＢとするとき、
１７＜νｄｐＡ＜２５
０．０２＜θｇＦｐＡ−０．６４３８＋０．００１６８２×νｄｐＡ＜０．０５
６０＜νｄｐＢ＜１００
０．００１＜θｇＦｐＢ−０．６４３８＋０．００１６８２×νｄｐＢ＜０．０６０
なる条件式を満足することを特徴とする光学系。 In order from the object side to the image side, the first lens unit, an aperture stop, and a second lens unit having a positive refractive power,
The height from the optical axis of the paraxial light beam that passes through the lens surface closest to the object is the optical axis through which the paraxial light beam passes through the lens surface on the image side from the intersection of the optical axis and pupil paraxial light beam. a smaller optics than the maximum value of the height from,
The second lens group has a positive lens A and a positive lens B, wherein each material Abbe numbers and parts partial dispersion ratio of the positive lens A νdpA, θgFpA, Abbe number of the positive lens B materials and parts min When the dispersion ratios are νdpB and θgFpB, respectively.
17 <νdpA <25
0.02 <θgFpA−0.6438 + 0.001682 × νdpA <0.05
60 <νdpB <100
0.001 <θgFpB−0.6438 + 0.001682 × νdpB <0.060
An optical system that satisfies the following conditional expression:
２０＜νｄｐＡ×ｆｐＡ／ｆ＜７０
なる条件式を満足することを特徴とする請求項１に記載の光学系。 When the focal length of the positive lens A is fpA and the focal length of the entire system is f,
20 <νdpA × fpA / f <70
The optical system according to claim 1, wherein the following conditional expression is satisfied.
１．２＜（νｄｐＢ×ｆｐＢ）／（νｄｐＡ×ｆｐＡ）＜６．０
なる条件式を満足することを特徴とする請求項１乃至３のいずれか１項に記載の光学系。 When the focal length of the positive lens A is fpA and the focal length of the positive lens B is fp B ,
1.2 <(νdpB × fpB) / (νdpA × fpA) <6.0
The optical system according to claim 1, wherein the following conditional expression is satisfied.
前記連続して配置された２枚以上の負レンズに含まれる１枚の負レンズを負レンズＣとして、該負レンズＣの材料のアッベ数をνｄｎＣ、前記負レンズＣの焦点距離をｆｎＣ、前記正レンズＡの焦点距離をｆｐＡとするとき、
２＜｜（νｄｎＣ×ｆｎＣ）／（νｄｐＡ×ｆｐＡ）｜＜１４
なる条件式を満足することを特徴とする請求項１乃至４のいずれか１項に記載の光学系。 The first lens group includes two or more negative lenses which are arranged to continue communicating to the image side from the object side,
Said the one negative lens which continuously included in the arranged 2 or more negative lenses and a negative lens C, NyudnC the Abbe number of the negative lens C material, FNC the focal length of the negative lens C, When the focal length of the positive lens A is fpA,
2 <| (νdnC × fnC) / (νdpA × fpA) | <14
5. The optical system according to claim 1, wherein the following conditional expression is satisfied.
０．００１＜θｇＦｎＣ−０．６４３８＋０．００１６８２×νｄｎＣ＜０．０６０
なる条件式を満足することを特徴とする請求項５に記載の光学系。 When the partial dispersion ratio of the material of the negative lens C is θgFnC,
0.001 <θgFnC−0.6438 + 0.001682 × νdnC <0.060
The optical system according to claim 5, wherein the following conditional expression is satisfied.
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