Follow focus flash arrangement
US4268138A · kind A · utility
1Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | May 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic camera exposure and flash fire control system provides for a proportional fill flash by firing an electronic flash or strobe at an aperture appropriate for the camera-to-subject range. The flash is fired during the closing movement of the shutter blade mechanism and subsequent to the integration of ambient scene light to a select proportion of the optimum film exposure value whereby the remaining proportion of the optimum film exposure value is provided by the artificial illumination from the flash during the closing of the shutter blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.