Exposure control apparatus with compensation for film reciprocit

Details Exposure control apparatus with compensation for film reciprocit Exposure control apparatus with compensation for film reciprocit

1979-01-29

1981-04-28

Nelms, David C.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250214P, G03B 7083

Patent

active

042641632

ABSTRACT:
A camera includes a photographic film having a given film speed which decreases when the film is exposed to light which varies from a given illumination level. A camera shutter is controlled by a timing circuit adapted to produce an exposure which is adjusted to compensate for the decreased film speed.

REFERENCES:
patent: Re26627 (1969-07-01), Burgarella
patent: 3386358 (1968-06-01), Kropp
patent: 3711721 (1973-01-01), Hansen
patent: 4037237 (1977-07-01), Maigret
patent: 4085411 (1978-04-01), Genesi

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