Dynamically controlled scene radiation leakage for exposure cont

Details Dynamically controlled scene radiation leakage for exposure cont Dynamically controlled scene radiation leakage for exposure cont

1981-12-16

1985-09-24

Perkey, William B.

354482, G03B 7099

Patent

active

045429731

ABSTRACT:
Method and exposure control apparatus are disclosed for generally simultaneously evaluating preselected different frequencies during a portion of the exposure cycle for controlling exposure. Included is an arrangement responsive to movement of the shutter mechanism for facilitating combined evaluation of a first set of preselected scene radiation frequencies transmitted along a given first path for evaluation of flash illumination and at the same time preselected lesser amounts of a second set of scene radiation frequencies, different from the first set, transmitted along a second given path for ambient evaluation. In one preferred embodiment, the evaluated first set of frequencies comprises essentially infrared frequencies and the evaluated second set of frequencies comprises essentially visible frequencies.

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