Camera flash photography systems

Details Camera flash photography systems Camera flash photography systems

1979-07-12

1981-12-15

Hix, L. T.

354 43, 354149, G03B 7085, G03B 1505

Patent

active

043056474

ABSTRACT:
In a flash photography mode for a camera, a preliminary flash is generated for a substantial duration and substantially constant intensity prior to the primary flash used for actual photographing such that the diaphragm aperture of the camera may be changed from an initial aperture size by a control signal generated by a light receiving element for receiving light through the diaphragm aperture during the duration of the preliminary flash, which control signal interrupts the stopping-down of the aperture to determine the appropriate aperture size for the photographic conditions.

REFERENCES:
patent: 3547017 (1970-12-01), Harvey
patent: 3836924 (1974-09-01), Kawasaki
patent: 3950766 (1976-04-01), Erlichman et al.
patent: 4023188 (1977-05-01), Ueda et al.
patent: 4146317 (1979-03-01), Date et al.
patent: 4146318 (1979-03-01), Rochat

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