JPS5461920A - Rear aperture large aperture photographic lens - Google Patents
Rear aperture large aperture photographic lensInfo
- Publication number
- JPS5461920A JPS5461920A JP12904377A JP12904377A JPS5461920A JP S5461920 A JPS5461920 A JP S5461920A JP 12904377 A JP12904377 A JP 12904377A JP 12904377 A JP12904377 A JP 12904377A JP S5461920 A JPS5461920 A JP S5461920A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- aperture
- object side
- positive
- constitution
- 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
Links
Landscapes
- Lenses (AREA)
Abstract
PURPOSE: To improve aberration corrections by forming the lens in 4-group 5- element construction consisting of positive first, second lens, a biconcave third lens and a cemented positive lens of biconvex and negative lens subsequently from the object side and letting the respective lens specifications satisfy specific relations.
CONSTITUTION: In the constitution wherein first and second groups are positive meniscus lenses whose convex faces are directed to the object side, third groups is a biconcave lens, fourth group is a postive lens cemented of a biconvex lens and a negative meniscus lens and an aperture is disposed therebehind; these are so constituted that the respective lens specifications satisfy the relations shown in Table I where the radii of curvature of the lens faces of the respective lenses are let to be Ri, axial thicknesses or air spacings to be Di, refractive indices to be Ni and Abbe number to be vi subsequently from the object side. Thereby, the rear aperture lens of good aberration correction may be realized despite large apertures of over F1:2.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12904377A JPS5461920A (en) | 1977-10-27 | 1977-10-27 | Rear aperture large aperture photographic lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12904377A JPS5461920A (en) | 1977-10-27 | 1977-10-27 | Rear aperture large aperture photographic lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5461920A true JPS5461920A (en) | 1979-05-18 |
Family
ID=14999671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12904377A Pending JPS5461920A (en) | 1977-10-27 | 1977-10-27 | Rear aperture large aperture photographic lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5461920A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5639510A (en) * | 1979-09-07 | 1981-04-15 | Konishiroku Photo Ind Co Ltd | Behind the lens iris |
| JPS5860716A (en) * | 1981-10-07 | 1983-04-11 | Nippon Kogaku Kk <Nikon> | Behind stop lens |
| GB2410568A (en) * | 2004-01-30 | 2005-08-03 | Camdeor Technology Co Ltd | Automatic focusing lens assembly in a camera |
| RU2645912C1 (en) * | 2017-05-30 | 2018-02-28 | Публичное акционерное общество "Красногорский завод им. С.А. Зверева" | High-aperture lens |
| US11709346B2 (en) | 2017-02-08 | 2023-07-25 | Largan Precision Co., Ltd. | Optical imaging system, imaging apparatus and electronic device |
-
1977
- 1977-10-27 JP JP12904377A patent/JPS5461920A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5639510A (en) * | 1979-09-07 | 1981-04-15 | Konishiroku Photo Ind Co Ltd | Behind the lens iris |
| JPH0118402B2 (en) * | 1979-09-07 | 1989-04-05 | Konishiroku Photo Ind | |
| JPS5860716A (en) * | 1981-10-07 | 1983-04-11 | Nippon Kogaku Kk <Nikon> | Behind stop lens |
| GB2410568A (en) * | 2004-01-30 | 2005-08-03 | Camdeor Technology Co Ltd | Automatic focusing lens assembly in a camera |
| GB2410568B (en) * | 2004-01-30 | 2008-09-17 | Camdeor Technology Co Ltd | Automatic focusing lens assembly in a camera |
| US11709346B2 (en) | 2017-02-08 | 2023-07-25 | Largan Precision Co., Ltd. | Optical imaging system, imaging apparatus and electronic device |
| US11988817B2 (en) | 2017-02-08 | 2024-05-21 | Largan Precision Co., Ltd. | Optical imaging system, imaging apparatus and electronic device |
| RU2645912C1 (en) * | 2017-05-30 | 2018-02-28 | Публичное акционерное общество "Красногорский завод им. С.А. Зверева" | High-aperture lens |
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