Anamorphic zoom lens
US3990785A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Apr 15, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an anamorphic zoom lens of rear system intended for photography or projection, which, seen from the object, consists of an afocal zoom part, an afocal anamorphic lens system and an image forming lens system. The above mentioned anamorphic lens system consists of a front group at the side of the object and of a rear group at the side of the image plane, and is formed as an afocal system with the front group having positive power and the rear group having negative power. By means of this composition the relation between the position of the iris in the anamorphic lens and the anamorphic lens system is controlled in such a manner that the picture quality is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.