Exposure control device for a camera

Details Exposure control device for a camera Exposure control device for a camera

1979-12-21

1981-09-15

Hix, L. T.

354 51, 354 60R, G03B 7083

Patent

active

042893895

ABSTRACT:
A camera exposure control device having TTL light measuring circuitry capable of spot metering and also averaged metering is disclosed, the spot metering being used for measurement with the camera directed to a main object prior to the camera release operation, and the averaged metering being used for measurement with the camera positioned for making a desired composition including the main object. The difference between the logarithm of the spot metering output and that of the averaged metering output with the aperture at its initial size is stored prior to the aperture stopping-down motion. Exposure is actually controlled by the averaged metering output, which is obtained after the initiation of the aperture stopping-down motion in response to camera release operation with the stored difference between the aforementioned outputs added thereto, to thereby effectively achieve an exposure control equivalent to a control based on a spot metering output which would be obtained after the initiation of the aperture stopping-down motion.

REFERENCES:
patent: 3973266 (1976-08-01), Kakunodate et al.

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