Exposure control device for interchangeable lens camera
US5012268A · kind A · utility
19Cited by
3References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Jun 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure control device for an interchangeable-lens camera in which factors preventing the establishment of a relationship which ensures proper matching of the photographing lens and the camera body on both the lens side and the camera body side are taken into account. Memories are provided both in the lens and the camera body for storing values characterizing the lens and camera body with respect to parameters such as focal length, exit pupil position, vignetting factor, and open-aperture F number. Specific equations are disclosed for carrying out corrections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.