Photography – With object illumination for exposure – Having preexposure illumination
Patent
1996-08-14
2000-12-26
Adams, Russell
Photography
With object illumination for exposure
Having preexposure illumination
396167, 396203, G03B 1503, G03B 716, G03B 970, G03B 1718
Patent
active
061672025
ABSTRACT:
A camera system which performs light measurement by causing a flash unit to perform a preliminary emission before causing said flash unit to perform a main emission, and computes a control value for the main emission on the basis of a result of the light measurement, includes charge detecting circuitry for detecting a state of charge of a capacitor for storing energy to be used for emission of the flash unit, an upper limit value computer for computing an amount-of-emission upper limit value on the basis of a detection result provided by said charge detecting circuitry and decision circuitry for determining whether flash control under which the main emission can provide a correct amount-of-emission is possible, before the main emission on the basis of the control value and an amount-of-emission upper limit value computed by the upper limit value computer after the preliminary emission.
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Adams Russell
Canon Kabushiki Kaisha
Mahoney Christopher E
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