Automatic exposure control circuit for TTL automatic electronic

Details Automatic exposure control circuit for TTL automatic electronic Automatic exposure control circuit for TTL automatic electronic

1982-11-19

1984-07-17

Adams, Russell E.

354416, 354480, G03B 700, G03B 1505

Patent

active

044602626

ABSTRACT:
An automatic exposure control circuit for a TTL automatic electronic flash for use with a camera having an electronic flash controlling capability and capable of photometry of reflection from a film surface performs photometry of stationary light until a shutter is fully open and then controls an emission of flashlight when the shutter is fully open and subsequently controls again photometry of stationary light after termination of the flashlight so that a ratio of the stationary light to the flashlight in light quantity can be an appropriate value.

REFERENCES:
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 4065777 (1977-12-01), Maitani et al.
patent: 4107706 (1978-08-01), Ueda et al.
patent: 4359275 (1982-11-01), Hasegawa

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