Camera capable of metering light transmitting through a viewfinder
US5717966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/099
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Camera capable of indicating set photographic field by masking an area out of the photographic field nearby an image forming plane within a visual field of a viewfinder or lowering transmittance of the area in accordance with a change of photography format such as from an ordinary shot to a panoramic shot. The camera includes light-receiving elements for photometry which output a signal in response to amount of light transmitted through the image forming plane within an optical path of the viewfinder, a correcting circuit for correcting the element output in response to the set photographic field, and a photometry circuit for calculating a photometric value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.