1981-11-20
1983-07-05
Perkey, William B.
354 53, 354 60L, 354289, G03B 7081, G03B 1720
Patent
active
043915000
ABSTRACT:
A single lens reflex camera having at least first and second light measuring circuits of different light measuring distribution for producing outputs representative of logarithmically compressed information which is a function of the brightness of a scene to be photographed, and a computer for computing the outputs of the first and second measuring circuits. A measuring sensitivity pattern selector is provided outside the camera housing. Upon adjustment of the mixture ratio of the light values, the computer is caused to produce a first output, and the outputs of the first and second light measuring circuits are computed by the aforesaid computer based on a predetermined relationship to produce a second output. When the difference between the first and second computer output falls within a certain range of values, exposure is controlled by the first computer output, and when the output falls out of the certain range of values by the second computer output.
REFERENCES:
patent: 3790275 (1974-02-01), Huboi et al.
patent: 3884584 (1975-05-01), Tsunekawa et al.
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4104655 (1978-08-01), Strauss
Canon Kabushiki Kaisha
Perkey William B.
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