Photographic camera having an interchangeable lens

Details Photographic camera having an interchangeable lens Photographic camera having an interchangeable lens

1987-10-30

1988-11-22

Perkey, W. B.

354400, 3542891, 354441, G03B 308, G03B 310, G03B 7097

Patent

active

047869348

ABSTRACT:
A photographic camera having an interchangeable lens and an automatic exposure control and focusing device comprising a computing circuit for the determination of the front and rear depth-of-field planes. The computing circuit is connected to a data memory on the camera side, a control unit, an autofocus central unit and an exposure control device. At a given stored sharpness and open aperture, the front and rear depth-of-field planes are automatically controlled by means of a setting element and can be assessed in the viewfinder. A predetermined depth-of-field range can be set and the required aperture can be displayed in the viewfinder and set, if this aperture is present on the interchangeable lens. The controlled depth-of-field planes remain visible in the viewfinder for a predetermined period of time.

REFERENCES:
patent: 4299457 (1981-11-01), Ducommon
patent: 4470681 (1984-09-01), Johnson
patent: 4557577 (1985-12-01), Shinoda
patent: 4584704 (1986-04-01), Ferren
patent: 4639110 (1987-01-01), Rinn et al.
patent: 4639588 (1987-01-01), Shinoda

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