Exposure control apparatus for flash photography

Details Exposure control apparatus for flash photography Exposure control apparatus for flash photography

1980-06-16

1982-03-02

Hix, L. T.

354 50, G03B 7093, G03B 714, G03B 1503

Patent

active

043176224

ABSTRACT:
Exposure control apparatus for a camera having an objective lens, an unregulated, fixed output flash device which, in the absence of ambient light, provides one-half stop of underexposure of a photographic subject located at the near limit acceptable image focus point of the lens, and a mechanism for automatically controlling an exposure in accordance with the intensity of the ambient light. In a flash exposure mode, the mechanism is operated to produce an exposure which, in the absence of artificial illumination, would provide one-half stop of underexposure of the photographic subject. The total exposure, flash plus ambient, is within .+-. one-half stop of a nominally correct exposure throughout the useable depth of field of the camera lens.

REFERENCES:
patent: 4023187 (1977-05-01), Shenk
patent: 4035813 (1977-07-01), Whiteside
patent: 4192587 (1980-03-01), LaRocque et al.

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