Depth of field objective
US4274725A · kind A · utility
5Cited by
1References
7Claims
0Family size
Inventor
Key dates
| Filing date | Jan 11, 1978 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Jan 11, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an objective for still cameras and motion picture cameras into which the critical focusing values of the two boundary points of a selected depth of field range are fed without being examined, whereupon the lenses and the diaphragm are adjusted automatically for a sharp reproduction of the respective range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.