Inverted telephoto type wide angle lens system
US4449793A · kind A · utility
8Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1981 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Jul 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An inverted telephoto type wide angle lens system is provided. The lens system comprises an aperture stop, a first lens group located at the object side of the aperture stop, and a second lens group located at the image side of the aperture stop, the second lens group including at least two movable focusing lens groups, whereby the focusing is practiced by only the movement of the focusing lens groups with the remaining lens elements in the lens system stationary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.