Indicator for proper or improper exposure by automatic electroni

Details Indicator for proper or improper exposure by automatic electroni Indicator for proper or improper exposure by automatic electroni

1982-12-03

1985-05-21

Hix, L. T.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

3542891, 315133, 315151, G03B 1502

Patent

active

045182370

ABSTRACT:
An indicator for proper or improper exposure provided by automatic electronic flash includes a first decision circuit having a first decision level lower than a proper level of exposure, and a second decision circuit having a second decision level higher than the proper level of exposure. Thus, a given film latitude is allowed for the overexposure and the underexposure in determining and displaying the overexposure, the underexposure or proper exposure.

REFERENCES:
patent: 4122465 (1978-10-01), Hasegawa et al.
patent: 4193677 (1980-03-01), Hasegawa et al.

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