JPS6479717A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS6479717A JPS6479717A JP23649487A JP23649487A JPS6479717A JP S6479717 A JPS6479717 A JP S6479717A JP 23649487 A JP23649487 A JP 23649487A JP 23649487 A JP23649487 A JP 23649487A JP S6479717 A JPS6479717 A JP S6479717A
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- phi1
- power
- lens group
- 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 obtain a large-aperture lens which is small-sized, light-weight, and low-cost though having not a high variable power ratio, by constituting a zoom lens of a first group consisting of a compensator lens group, a second group consisting of a variator lens group, and a third group consisting of a fixed lens group and focusing the lens by the first group. CONSTITUTION:The zoom lens consists of a first group I consisting of the compensator lens group which has a positive refracting power and is moved at the time of zooming to keep the image surface fixed, a second group II consisting of the variator lens group which has a negative refracting power and is moved to vary the power, and a third group III consisting of the fixed lens group having a positive refractive power in order from the object side. Focusing at an arbitrary focal length is performed by movement of the first group, and these lenses satisfy conditions 0.28<phi1/¦phi2¦<0.43 (phi1<0) and 0.18<phi1fw<0.32 where phi1 and phi2 are refracting powers of the first group and the second group respectively and fw is the resultant focal length of the whole of the system in the wide end.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23649487A JPS6479717A (en) | 1987-09-21 | 1987-09-21 | Zoom lens |
US07/244,796 US4984876A (en) | 1987-09-16 | 1988-09-15 | Zoom lens system |
US08/053,559 US5296968A (en) | 1987-09-16 | 1993-04-27 | Zoom lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23649487A JPS6479717A (en) | 1987-09-21 | 1987-09-21 | Zoom lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6479717A true JPS6479717A (en) | 1989-03-24 |
Family
ID=17001563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23649487A Pending JPS6479717A (en) | 1987-09-16 | 1987-09-21 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6479717A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001083387A (en) * | 1999-09-10 | 2001-03-30 | Canon Inc | Lens barrel and projection display device provided therewith |
WO2013136670A1 (en) * | 2012-03-16 | 2013-09-19 | 株式会社ニコン | Optical system, optical device and method for manufacturing optical system |
-
1987
- 1987-09-21 JP JP23649487A patent/JPS6479717A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001083387A (en) * | 1999-09-10 | 2001-03-30 | Canon Inc | Lens barrel and projection display device provided therewith |
WO2013136670A1 (en) * | 2012-03-16 | 2013-09-19 | 株式会社ニコン | Optical system, optical device and method for manufacturing optical system |
JP2013195560A (en) * | 2012-03-16 | 2013-09-30 | Nikon Corp | Optical system, optical device, and method of manufacturing optical system |
US9671586B2 (en) | 2012-03-16 | 2017-06-06 | Nikon Corporation | Optical system, optical apparatus and method for manufacturing the optical system |
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