JPS6474518A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS6474518A JPS6474518A JP23129487A JP23129487A JPS6474518A JP S6474518 A JPS6474518 A JP S6474518A JP 23129487 A JP23129487 A JP 23129487A JP 23129487 A JP23129487 A JP 23129487A JP S6474518 A JPS6474518 A JP S6474518A
- Authority
- JP
- Japan
- Prior art keywords
- positive
- group
- whose
- negative
- lens
- 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 offer an inexpensive zoom lens whose overall length is very short, whose aperture is large and whose aberration is also satisfactory, although its variable power rate is low by constituting the titled zoom lens of three groups of a first positive group, a second negative group and a third positive group, and forming the third group as a fixed part constituted of four pieces of positive, positive, negative and positive. CONSTITUTION:The first group I consists of two pieces of a negative meniscus lens being convex to an object side and a biconvex lens whose strong face has been turned to the object side and has positive refracting power, and the second group II consists of two pieces of a negative lens whose strong face has been turned to an image side and a positive meniscus lens being convex to the object side and has negative refracting power. The third group III constituted of four pieces of a positive lens whose strong refracting face has been turned to the image side, a positive lens whose strong refracting face has been turned to the object side, a biconcave lens whose strong refracting face has been turned to the image side, and a biconvex lens, in order from the object side, and has positive refracting power as a whole. In such a way, by constituting the third group of positive, positive, negative and positive, an inexpensive zoom lens whose overall length is short enough, whose aperture is large, and whose aberration is also satisfactory can be realized.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23129487A JPS6474518A (en) | 1987-09-16 | 1987-09-16 | 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 |
---|---|---|---|
JP23129487A JPS6474518A (en) | 1987-09-16 | 1987-09-16 | Zoom lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474518A true JPS6474518A (en) | 1989-03-20 |
Family
ID=16921356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23129487A Pending JPS6474518A (en) | 1987-09-16 | 1987-09-16 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474518A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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
- 1987-09-16 JP JP23129487A patent/JPS6474518A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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