Camera which sets an internal aperture value in accordance with

Details Camera which sets an internal aperture value in accordance with Camera which sets an internal aperture value in accordance with

1995-08-17

1996-12-24

Perkey, W. B.

Photography

Exposure control circuit

Diaphragm function only

348340, 348366, 396281, G03B 7095, G03B 7097, G03B 720, G03B 1718

Patent

active

055877664

ABSTRACT:
A camera which sets an aperture value of an internal aperture in accordance with the open aperture value of a photographic lens aperture of an installed photographic lens. A reduction optical system reduces an optical image formed by the photographic lens when the photographic lens is installed on the camera, the optical image being reduced by a reduction ratio. An internal aperture of the camera has a settable aperture value. A control unit receives the open aperture value of the photographic lens aperture when the photographic lens is installed on the camera, conveys the open aperture value in accordance with the reduction ratio of the reduction optical system, and sets an aperture value of the internal aperture in a range having a lower limit of approximately the converted open aperture value. Additionally, the control unit can set the aperture value of the internal aperture to produce the correct exposure time in accordance with an exposure time of an image pickup element and the converted open aperture value, where the exposure time is set by the photographer. Moreover, the aperture value of the internal aperture can be set by the photographer, and the control unit can then set the exposure time of an image pickup element in accordance with the set exposure time and the converted open aperture value.

REFERENCES:
patent: 4558940 (1985-12-01), Tano et al.
patent: 4833498 (1989-05-01), Kato et al.
patent: 4970541 (1990-11-01), Nakai et al.

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