JPS5950416A - Lens for compact camera - Google Patents

Lens for compact camera

Info

Publication number
JPS5950416A
JPS5950416A JP16191082A JP16191082A JPS5950416A JP S5950416 A JPS5950416 A JP S5950416A JP 16191082 A JP16191082 A JP 16191082A JP 16191082 A JP16191082 A JP 16191082A JP S5950416 A JPS5950416 A JP S5950416A
Authority
JP
Japan
Prior art keywords
lens
equation
conditions
negative
correcting
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.)
Pending
Application number
JP16191082A
Other languages
Japanese (ja)
Inventor
Shigetada Sato
重忠 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP16191082A priority Critical patent/JPS5950416A/en
Publication of JPS5950416A publication Critical patent/JPS5950416A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To make back focusing extremely short and to correct satisfactorily image performance over a wide field angle by satisfying specific condition equations with the five-group constitution of a positive meniscus lens, a negative lens, two groups of biconvex positive lenses and a negative lens. CONSTITUTION:A lens is constituted, successively from an object side, of the 1st group of a positive meniscus lens, the 2nd group of a negative meniscus lens, the 3rd and the 4th groups of biconvex positive lenses, and the 5th group of a negative lens. Five equations of specific condition equations are satisfied. The 1st conditions are the equation for realizing the miniaturization of the lens system and if the upper limit in this equation is exceeded, the generation of a negative spherical aberration and a positive distortion aberration increases. The 2nd conditions are the equation for correcting a spherical aberration, the 3rd conditions are the equation for correcting comatic aberration and astigmatism, the 4th conditions are the equation for correcting the deterioration in the curvature of field and the 5th conditions are the equation for correcting a chromatic aberration. A bright and compact lens system having short back focusing and good performance is thus obtd.

Description

【発明の詳細な説明】 近年、コンバクｈカメラの普及は著しく、更にコンバク
１〜で明るいレンズへの要望も強い。DETAILED DESCRIPTION OF THE INVENTION In recent years, compact h cameras have become extremely popular, and there is also a strong demand for lenses that are bright in compact h cameras.

本発明は、５５°以上の画角を包括し、Ｆナンバー３．
５〜２．８程度で、望遠比が１１程度の極めてコンバク
１へな写真レンズに関するものである。The present invention covers an angle of view of 55 degrees or more, and has an F number of 3.
5 to 2.8, and has a telephoto ratio of about 11, which is an extremely compact photographic lens.

レンズ系の全長を短くする手段としては、望遠比（レン
ズ系第１面から像面までの距離と焦点距離との比）を小
さく保ちながらレンズ系の焦点距離を短くする方法があ
るが、レンズ自身の厚みを薄くするには、物理的に限界
があり、更にレンズ系の全長（レンズ系第１面から像面
までの距離）を縮めるにはレンズ系のハックフォーカス
を短くする必要がある。One way to shorten the total length of a lens system is to shorten the focal length of the lens system while keeping the telephoto ratio (the ratio of the distance from the first surface of the lens system to the image plane to the focal length) small. There is a physical limit to reducing the thickness of the lens itself, and in order to further reduce the total length of the lens system (distance from the first surface of the lens system to the image plane), it is necessary to shorten the hack focus of the lens system.

ところで、レンズ系のバックフォーカスを短くするレン
ズタイプとしては、後方に負レンズ群を配した望遠タイ
プが適していることがよく知られているが、焦点ｒ１５
．離も短くする為には、広画角の範囲にわたってレンズ
性能を良好に維持する必要が生じる。By the way, it is well known that a telephoto type with a negative lens group at the rear is suitable as a lens type that shortens the back focus of the lens system.
．． In order to shorten the distance, it is necessary to maintain good lens performance over a wide angle of view.

従来より、広い画角を包括する望遠タイプのレンズタイ
プを採用したコンパクトカメラ用レンズとしては、４　
ｉ１Ｙ’Ｉ枚構成の特開昭５５　７３０１４号公報や、
４　ｉＹ、　／Ｉ枚構成で非球面レンズを使用した特皿
昭５６　５９２１７号公報が既に公知であるが、これら
はレンズ系のバックフォ−カスが焦点距＃［の０．７１
５倍程程度明るさも１７ナンバー３．５程度である。Conventionally, there are 4 compact camera lenses that use a telephoto lens type that covers a wide angle of view.
JP-A-55-73014 with i1Y'I sheet composition,
4 iY, /I lens configuration using an aspherical lens is already known in the publication of special plate No. 59217, but in these, the back focus of the lens system is 0.71 of the focal length #[
The brightness is about 3.5 times the 17 number.

本発明は、レンズ構成を非球面レンズを使用しなイ５？
ｌＹ’　５枚構成トシ、Ｔ’ｆンハ−カ３．５−２．８
ｉ１度で、レンズ系のバンクフォーカスが焦点距離の０
．２５〜０．１４倍程度と棲めてコンバク１へであり、
広い画角にわたって像性能が良りｒに補正されたレンズ
系を見出すのに成巧したものである。The present invention does not use an aspherical lens in the lens configuration.5?
lY' 5-piece toshi, T'f hammer 3.5-2.8
i1 degree, the bank focus of the lens system is 0 of the focal length
．． It is about 25 to 0.14 times and it goes to Combaku 1,
This technique was successful in finding a lens system that has good image performance over a wide angle of view and is corrected to r.

まず本発明のレンズ構成を説明すると、物体側から順に
、正メニスカスレンズの第ルンズ、負レンズの第２レン
ズ、両凸正レンズの第３レンズ。First, the lens configuration of the present invention will be explained. In order from the object side, the first lens is a positive meniscus lens, the second lens is a negative lens, and the third lens is a biconvex positive lens.

両凸正レンズの第４レンズ、負レンズの第５レンズで構
成されており、次の各条件を満足する５群５枚構成の性
能良好でコンパクトなコンバク１−カメラ用レンズ。Compact 1-camera lens with good performance and composed of 5 elements in 5 groups, which is composed of a 4th lens that is a biconvex positive lens and a 5th lens that is a negative lens, and satisfies each of the following conditions.

（１）　　１　、４０　＜　−＜　１　、８０ｆ、・２ ｆ４１ （２）　　０．８５＜　−＜ｉ、ｏｏ　　　　ｆ４＜Ｏ
ｆ＋ ｆ４１ （３）　　０．／１５＜　−＜０．６０　　　　ｆ４．
＜Ｏ５ （４）　　１．／１０＜　−−−−−”−−−□−ｎ　
２１　ｒ　：ｔ、ｔｅｌ （５）　　９　、５　＜　Ｖ　１−ν９但し ｆ二全系の合成焦点距離 ｆ　１．２　：　第］　レンズ０）　焦点距ｆｌｌｉｆ
Ｉ：第ルンズの物体側の面の焦点距離ｆ４＝第２レンズ
の像側の面の焦点距離ｆ５：第３レンズの物体側の面の
焦点距離ｆａ、旬：第２レンズの焦点距離 ｎ２：ｉ２レンス（ｉ’）ｄ−１ｊｎ　ｅに対する屈折
率シｌ、シ２：各々第ルンズ、第２レンズのアツベ数次
に−に記音条件について説明する。(1) 1,40<-<1,80f,・2 f41 (2) 0.85<-<i,oo f4<O
f+ f41 (3) 0. /15<-<0.60 f4.
<O5 (4) 1. /10< −−−−−”−−−□−n
21 r : t, tel (5) 9 , 5 < V 1 - ν9 However, f 2 Combined focal length of the entire system f 1.2 : th ] Lens 0) Focal length flllif
I: Focal length of the object-side surface of the second lens f4 = Focal length of the image-side surface of the second lens f5: Focal length fa of the object-side surface of the third lens: Focal length of the second lens n2: i2 lens (i') d - refractive index for 1 jne e, s 1, s 2: Abbe numbers of the 1st lens and 2nd lens, respectively.Next, the notation conditions will be explained.

条件（１）はレンズ系の小型化を実現する為に必要であ
る。（１）の条件の上限を越えると、レンズ系の小型化
には有利であるが、負の球面収差や正の歪曲収差の発生
が人となり、他の部分での補正が困難となる。条件（１
）の下限を越えると、レンズの全長が長くなり、また周
辺光量を十分に取り入れながら前玉径を小さくすること
が困難となり、レンズ系の小型化には小利である。Condition (1) is necessary to realize miniaturization of the lens system. If the upper limit of condition (1) is exceeded, it is advantageous for downsizing the lens system, but negative spherical aberration and positive distortion will occur, making correction in other parts difficult. Condition (1
), the total length of the lens becomes long, and it becomes difficult to reduce the diameter of the front lens while taking in a sufficient amount of peripheral light, so there is a small profit in miniaturizing the lens system.

条件（２）は球面収差の補正に重要な条件である。Condition (2) is an important condition for correcting spherical aberration.

この（２）の条件外では他の収差を良好に保ちながら球
面収差をバランス良く補正することが困難となる。Outside the condition (2), it becomes difficult to correct spherical aberration in a well-balanced manner while maintaining other aberrations well.

条件（３）はコマ収差、非点収差を良好に補正する為に
必要な条件である。この（３）の条件外ではコマ収差、
非点収差と球面収差との補正のバランスが崩れ、他の部
分での補正が困難となる。Condition (3) is a necessary condition for properly correcting coma aberration and astigmatism. Outside of this condition (3), coma aberration,
The balance between correction of astigmatism and spherical aberration is disrupted, making it difficult to correct other parts.

条件（４）は、レンズ系の正レンズで発生する正のペッ
ツバール和を、第２レンズで発生する負のペッツバール
和で打消し、像面弯曲の劣化を補正しようとするもので
ある。条件（４）の下限はその効果を得る為の限界であ
る。Condition (4) is intended to cancel the positive Petzval sum generated in the positive lens of the lens system with the negative Petzval sum generated in the second lens, thereby correcting the deterioration of the field curvature. The lower limit of condition (4) is the limit for obtaining this effect.

条件（５）は色収差を補正する為に重要となる第ルンズ
と第２レンズのアツベ数の関係に課せられる条件である
。この（５）の条件外では、色収差を補正する為に第ル
ンズと第２レンズのパワーが強くなり過ぎ、他の、！ｈ
収差をバランス良く補正することか困難となる。Condition (5) is a condition imposed on the relationship between the Abbe numbers of the first lens and the second lens, which is important for correcting chromatic aberration. Outside of this condition (5), the power of the first lens and second lens becomes too strong to correct chromatic aberration, and other... h
It becomes difficult to correct aberrations in a well-balanced manner.

以上、本発明の構成によれは、レンズ系のバックフォー
カスが矩い崩めてコンバク１〜で明るい性能Ｊｉ　ＩＩ
なるレンズ系を得ることができるものである。As described above, depending on the configuration of the present invention, the back focus of the lens system becomes rectangular, and bright performance is achieved in the range 1 to 1.
This makes it possible to obtain a lens system with the following properties.

以下本発明の実施例を示す。レンズテータにおいて、ｒ
、、物体側から順には第１番［１の面の曲率半径、ｄｉ
は第ｊ番目の面間隔、ｎはｄｌｉｎｃに対する屈折率、
νはアツベ数である。Examples of the present invention will be shown below. In the lenstator, r
,,In order from the object side, the radius of curvature of the surface of No. 1 [1, di
is the jth interplanar spacing, n is the refractive index for dlinc,
ν is the Atsbe number.

実施例１ ｆ＝］、ＯＦナンバー　１：３．５８ 画角　２ω＝６１．２゜ ｒ　　　ｄ　　　ｎ １　　３．３６８　０．９７０　１．８８３００　　／
１０，８２　　６、、！３９８　０．２６８ ３　１５０．７１９１　０．５８９　１．８７１６（ｉ
６　２３．！’］４　　３．１３７　０．１９７ ５　　５．１０７　０．８０２　１．６９８９５　３０
．１６　−］、９．２］５　２．５７５ ７　　１６、／１５０　１．１１６　１．６７００３　
４７．３８　−３３．／１６４　２．２６２ ９　−６．２６７　０．７１／Ｉ　　１．／１６４５０
　６５．９ｔｏ　　−１６２，３９８ 望遠比　１．１１　バックフォーカス　０．１６ｆ実施
例２ ｆ＝ＩＯＰＩ−：／バー　１：２．８０画角　２ω＝６
］、６゜ ｄｉ　　　ｒ＋ ］　　　：１．２Ｄ７　１．１１８　１．７８３００　
３６．１２　　　１０．０＋８　　０．１７９ ３−１９８．４６８　０．５８９　１．８０５１８　２
５．４４　　２、！１Ｇ１　　（１，＋７８ Ｆｉ　　　４．５７］、　　０．９３３　１．５８１４
／ｌ　　’１０．８６−１８．（ｉ７３２．：１Ｕ２ ７　１１．８５（Ｊ　　１．２４０　１．６２３６／Ｉ
　　３Ｇ、５８　−６２．２：１２　２．４７７ ！′Ｊ６．３１３　０．７１／１１．５３１７２　４８
．９１０　−−７１．４３４ 望遠１七　１．１］　バックフォーカス　Ｏ，Ｉ４ｆ＋
１＞　　ｌ　　１　１．１１１ 実施例３ ｆ＝ＩＯＦナンバー　１：３．５８ 画角　２ω＝５８．４゜ ｒ、−ｄＬｒｌ １　　　　２．７６３　　０．８５８　　１．８８３０
０　　　／１０．８２　　４．７４９　０．１５７ ３　　　　２６．３４２　　０．５５５　　１．８４６
６６　　２３．９／ｌ　　　２．＋１１２　０．１０６ ５　　　　３．４１２　　０．７１４　　１．６９８９
５　　３０．１６　−１．０！Ｊ、７７７　２．０５１
７　　　　１２．９０５　　０．９４３　　１．６７０
０３　　　’１７．３８　−４２．６３８　１．８９５ ９　　　−５．５２０．　　０．６７２　　１．４６４
５０　　６５．９１０　−２２．３３０ 望遠比　１．ｏｓ　　バックフォーカス　０．２５　ｆ
一〜”−一−’＝”ｏ９１’Ｉｙ、＝１６．９ｎ２１　
　ｆ＝、、４１ 実　　施　　例　　４ ｆ＝Ｉｏ　　Ｆナンバー　　Ｌ　：　２．８０ｉ１Ｔｉ
ｉ角　２ω＝６１６゜ ｉ　　　ｎ ］　　　３．１８６　１．Ｅ９　　］、、６９６８０　
５５．５２　　８．４３１　０．２５’１ ３　　２’１．２６０　　（１，５８９１，，７８４７
２２５，７’］　　　３．Ｅ７　０．１６５ ５　　４．７６８　０．ｆＪ７８　１．６９８９５　３
０．１６　−１１．２！’）Ｉ　　２．２：１０７　　
１２．２００　１．０２０　１．６７０００　５７．３
８　１２２．０１８　１．９２０ ９　−５．３１４　０’、７］、／ｌ　　１．５０１３
７　５６．．１１０　−２２．０３１ 望遠比　１．１１　　バックフォーカス　０．２１　ｆ
一−−−−−−−−−−−＝１．５９３　　　　シ１−
シ２＝２９．８ｎ２　ｌ　ｆｉ、＝−１ 実施例５ ｆ＝１０１”ナンバー　］、：２２．８５画角２ω＝５
８．６゜ ｒｔｄｂ　　　ｎ １　　３．３３９　０．９４２　１．８８３００　４０
．８２　　７．１７６　　Ｑ、：３２５ ３　１４３．７８３　　Ｑ、５６０　１．８４６６ｔ３
　２３．９４　　３．０６Ｇ　　０．２２２ ５　　４．９９６　０．７８４　１．６９１Ｆ５　３０
．１６　−２４．９４４　２．１６６ ７　　１５．４（ｉ５　１．０７９　１．６７００３　
　’１７．３８　−２４．６７８　２．１．５０ ９　−５．４９Ｌ　　Ｏ，６７８１，４６４５０６５，
９１０−４８，１５７ 望遠比　１．１０　　バックフォーカス　０．２１　ｆExample 1 f=], OF number 1:3.58 Angle of view 2ω=61.2°r d n 1 3.368 0.970 1.88300 /
10,82 6,,! 398 0.268 3 150.7191 0.589 1.8716 (i
6 23. ! ']4 3.137 0.197 5 5.107 0.802 1.69895 30
．． 16 -], 9.2] 5 2.575 7 16, /150 1.116 1.67003
47.38 -33. /164 2.262 9 -6.267 0.71/I 1. /16450
65.9to -162,398 Telephoto ratio 1.11 Back focus 0.16f Example 2 f=IOPI-:/bar 1:2.80 Angle of view 2ω=6
], 6゜di r+ ]: 1.2D7 1.118 1.78300
36.12 10.0+8 0.179 3-198.468 0.589 1.80518 2
5.44 2,! 1G1 (1,+78 Fi 4.57], 0.933 1.5814
/l '10.86-18. (i732.:1U2 7 11.85 (J 1.240 1.6236/I
3G, 58 -62.2:12 2.477! 'J6.313 0.71/11.53172 48
．． 910 --71.434 Telephoto 17 1.1] Back focus O, I4f+
1> l 1 1.111 Example 3 f=IOF number 1:3.58 Angle of view 2ω=58.4°r, -dLrl 1 2.763 0.858 1.8830
0 /10.82 4.749 0.157 3 26.342 0.555 1.846
66 23.9/l 2. +112 0.106 5 3.412 0.714 1.6989
5 30.16 -1.0! J, 777 2.051
7 12.905 0.943 1.670
03 '17.38 -42.638 1.895 9 -5.520. 0.672 1.464
50 65.910 -22.330 Telephoto ratio 1. os back focus 0.25 f
1～"-1-'="o91'Iy,=16.9n21
f=,,41 Example 4 f=Io F number L: 2.80i1Ti
i angle 2ω=616°i n ] 3.186 1. E9],,69680
55.52 8.431 0.25'1 3 2'1.260 (1,5891,,7847
225,7'] 3. E7 0.165 5 4.768 0. fJ78 1.69895 3
0.16 -11.2! ')I 2.2:107
12.200 1.020 1.67000 57.3
8 122.018 1.920 9 -5.314 0', 7], /l 1.5013
7 56. ．． 110 -22.031 Telephoto ratio 1.11 Back focus 0.21 f
1−−−−−−−−−−−=1.593 C1−
2 = 29.8n2 l fi, = -1 Example 5 f = 101" number ], : 22.85 angle of view 2ω = 5
8.6゜rtdb n 1 3.339 0.942 1.88300 40
．． 82 7.176 Q, :325 3 143.783 Q, 560 1.8466t3
23.94 3.06G 0.222 5 4.996 0.784 1.691F5 30
．． 16 -24.944 2.166 7 15.4 (i5 1.079 1.67003
'17.38 -24.678 2.1.50 9 -5.49L O,6781,4645065,
910-48,157 Telephoto ratio 1.10 Back focus 0.21 f

【図面の簡単な説明】[Brief explanation of the drawing]

第１図、第３図、第５図、第７図および第９図は各々実
施（９１Ｊ　］　、実施例２．実施例３．実施例４およ
び実施例５のレンス断面図。 第２図、第４図、第６図、第８図および第１０図は各つ
実施例１．実施例２．実施例３．実施例４　ｊ’、；よ
び実施例５の収差図。 圏　　　　　　　　　　　　　　　　し〆） 振　　　　　　　　　　　　　　　　　　　　　　　Ｓ
七１1, 3, 5, 7, and 9 are lens sectional views of Example 2, Example 3, Example 4, and Example 5, respectively. Figures 4, 6, 8, and 10 are aberration diagrams of Example 1, Example 2, Example 3, Example 4 j', and Example 5. S
Seventy one

Claims (1)

【特許請求の範囲】 物体側から順に、正メニスカスレンズの第ルンズ、負レ
ンズの第２レンズ、両凸正レンズの第３レンス１両凸正
レンスの第４レンズ、負レンズの第５レンズで４１ｆｆ
成されており、次の各条件を満足する５群５枚構成の性
能良好でコンバク１−なコンパクトカメラ用レンズ。 （５）　　９．５＜ｙ＋−ν２ 但し ｆ：全系の合成焦点距離 ｆ　＋、２　：第ルンズの焦点距離 ｆ１：第ルンズの物体側の面の焦点距離ｆ／、：仄２レ
ンズの像側の面の焦点距離ｆ５：第３レンズの物体側の
面の焦点距離ｆ　３．４　：第２レンズの焦点距離 ｒ１２：第２レンズのｄ−１ｉｎｅに対する屈折率シ７
．ダ、：各々第ルンズ、第２レンズのアツベ数[Claims] In order from the object side, the first lens is a positive meniscus lens, the second lens is a negative lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, and the fifth lens is a negative lens. 41ff
This is a compact camera lens with good performance and a combination of 5 elements in 5 groups that satisfies the following conditions. (5) 9.5<y+-ν2 where f: composite focal length of the entire system f +, 2: focal length of the lens f1: focal length of the object side surface of the lens f/,: image of the second lens Focal length of the side surface f5: Focal length of the object side surface of the third lens f3.4: Focal length of the second lens r12: Refractive index of the second lens for d-1ine 7
．． Da: Atsube number of the first lens and second lens, respectively
JP16191082A 1982-09-17 1982-09-17 Lens for compact camera Pending JPS5950416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16191082A JPS5950416A (en) 1982-09-17 1982-09-17 Lens for compact camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16191082A JPS5950416A (en) 1982-09-17 1982-09-17 Lens for compact camera

Publications (1)

Publication Number Publication Date
JPS5950416A true JPS5950416A (en) 1984-03-23

Family

ID=15744337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16191082A Pending JPS5950416A (en) 1982-09-17 1982-09-17 Lens for compact camera

Country Status (1)

Country Link
JP (1) JPS5950416A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6364015A (en) * 1986-09-05 1988-03-22 Konica Corp Projection lens for projector
US4787721A (en) * 1984-08-18 1988-11-29 Minolta Camera Kabushiki Kaisha Photographic lens system
JP2012002846A (en) * 2010-06-14 2012-01-05 Olympus Corp Imaging optical system and imaging device using the same
US9864165B2 (en) 2015-04-29 2018-01-09 Largan Precision Co., Ltd. Imaging lens system, image capturing device and electronic device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787721A (en) * 1984-08-18 1988-11-29 Minolta Camera Kabushiki Kaisha Photographic lens system
JPS6364015A (en) * 1986-09-05 1988-03-22 Konica Corp Projection lens for projector
JP2012002846A (en) * 2010-06-14 2012-01-05 Olympus Corp Imaging optical system and imaging device using the same
US9864165B2 (en) 2015-04-29 2018-01-09 Largan Precision Co., Ltd. Imaging lens system, image capturing device and electronic device
US11762170B2 (en) 2015-04-29 2023-09-19 Largan Precision Co., Ltd. Imaging lens system, image capturing device and electronic device

Similar Documents

Publication Publication Date Title
US6088172A (en) Bright wide-angle lens
CN103221869B (en) Eyepiece varifocal optical system and optical device
JPS61213817A (en) Zoom finder
JPH06235858A (en) High performance photographic lens
JPS62187315A (en) Extremely small-sized zoom lens
JPS6040604B2 (en) Gauss type large aperture ratio photographic lens
JPS6243613A (en) Converter lens
JPS6119967B2 (en)
JP2000028919A (en) Middle telephotographic lens
JPS6134125B2 (en)
JPS61275809A (en) Bright wide-angle zoom lens
JP2007047334A (en) Imaging lens system, image reader, imaging device, and display apparatus
JPS5950416A (en) Lens for compact camera
JPS6149646B2 (en)
JPS59142515A (en) Zoom lens
JPS6116964B2 (en)
JP4171942B2 (en) Zoom lens
JPS58102208A (en) Compact zoom lens
JPS5965820A (en) Telephoto lens system
JPS6139647B2 (en)
US3958865A (en) Retrofocus type lens system
JPH1048702A (en) Kepler type variable power finder
JPH10301039A (en) Diopter correcting lens
JPH0296107A (en) Wide angle lens of long back focus
JPH02146014A (en) Telephoto type objective