Patent ID: 6094536
Filing Date: 2000-07-25
Classification: G03B

Abstract:
A flash photography system adapted to use a flash emission device for emitting a preliminary emission and a main emission, and arranged to control the main emission in accordance with data based on light measurement obtained from the preliminary emission, said system comprising:a light measuring circuit arranged to obtain a first measured light value by measuring light reflected from an object as a result of the preliminary emission and to obtain a second measured light value by measuring light without the preliminary emission;a detection circuit that detects the amount of light emitted by the flash emission device during a preliminary emission;a determination circuit that obtains object brightness information from the first measured light value and the second measured light value, and obtains exposure value information required for exposure by the main emission, and determines the main emission on the basis of (1) a difference or ratio between said object brightness information and said exposure value information, and (2) the amount of light detected by the detection circuit.