Focusing device in camera equipped with both standard and telephoto lenses
US4264175A · kind A · utility
6Cited by
4References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1980 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Jul 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B19/07
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera equipped with both a standard lens and a telephoto lens which may be arbitrarily selected for exposures by manipulating a first control knob, a focusing device is provided which selects the focusing ranges or depths of field of the telephoto lens by a second control knob only in the case of the photography with the telephoto lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.