Automatic control device for electronic flash

Details Automatic control device for electronic flash Automatic control device for electronic flash

1977-01-13

1980-02-12

Hix, L. T.

354 33, 354149, G03B 1505

Patent

active

041881044

ABSTRACT:
A photographic device includes means for automatic control of the quantity of light from an electronic flash by comparing the brightness of a main object to be photographed with the brightness of a sub-object to be photographed, and the shutter of the camera opens during the time in response to the brightness of a sub-object to be photographed.

REFERENCES:
patent: 3667357 (1972-06-01), Matsuda
patent: 3699858 (1972-10-01), Ogiso et al.
patent: 3779142 (1973-12-01), Yata et al.
patent: 3836920 (1974-09-01), Uchiyama et al.
patent: 3855601 (1974-12-01), Uchiyama et al.

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