Exposure control unit for flash photography

Abstract

Abstract PURPOSE: To easily perform flash photography corresponding to lighting contrast by providing an arithmetic circuit which calculates the flash emission quantity according to the lighting contrast having been preset based on stationary light intensity, exposure control value, etc. CONSTITUTION: An arithmetic circuit 3 makes operations by predetermined formulas corresponding to the lighting contrast of the ratios of the quantities of stationary light and flash contributing to photography to be preset by a strobe device 10 based on the steady light intensity from a measuring circuit 1 and the exposure setting value by a setting device 2. The flash emission quantity by these operations is signal-converted, and is compared with the strobe light-measured quantity from a measuring circuit 4, whereby the flash emission time etc. are controlled. According to other calculated exposure specifications, an aperture control part, a shutter control part, etc. are controlled and these specifications are displayed. Hence, without the photographer's prior calculations, the flash photography of the correct exposure taking the lighting contrast into consideration is easily accomplished. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Norio Ishikawa
• 👤 Nobuyuki Taniguchi
• 👤 Yoshio Yuasa

Bibliographic Details