Diaphragm controller for cameras in which the diaphragm opening

Details Diaphragm controller for cameras in which the diaphragm opening Diaphragm controller for cameras in which the diaphragm opening

1986-06-19

1987-09-15

Adams, Russell E.

354443, 354455, 354286, G03B 708

Patent

active

046935843

ABSTRACT:
A diaphragm controller for a camera of the program type which determines a reduced aperture in accordance with the brightness of an object being photographed and effects a diaphragm control based on an exposure period corresponding to the reduced aperture by measuring the amount of object light passing through the reduced aperture, compares a photometric output of light passing through an aperture during the aperture reducing operation and an output which is obtained by calculating an output which varies during the aperture reducing operation so as to satisfy a predetermined program characteristic and controls an aperture value based on the program characteristic when the photometric output and the calculated output coincide.

REFERENCES:
patent: 4196997 (1980-04-01), Ohmori et al.
patent: 4264159 (1981-04-01), Ueda et al.
patent: 4307948 (1981-12-01), Kitamura et al.
patent: 4381889 (1983-05-01), Sahara et al.

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