PHOTOMETRIC CONTROLLER OF FILM SURFACE REFLECTION PHOTOMETRIC CAMERA HAVING ELECTRONIC FLASH CONTROLLING FUNCTION

摘要

PURPOSE:To increase a ratio of the integration quantity of electronic flash light to natural light, by automatically delaying an integration start time point of a photoelectric current, when a larger difference of luminance than prescribed is generated between a main object to be photographed, and a back ground part. CONSTITUTION:Reflected rays from a shutter front curtain surface in a photographing picture, and a film surface exposed by running of its front curtain are photodetected by photometric photoelectric converting elements 26, 36, the photoelectric current is integrated 27, a light emission stopping signal is sent out to a TTL auto electronic flash which has emitted light at the electronic flash tuning second time when the integration value has reaches a prescribed level, and light emission of the electronic flash is stopped. In this case, the luminance of a specified part 6b of the photographing picture is compared with the lumiance of its circumferential part 6a, and when contrast of both the luminances has become a prescribed value, a deciding signal is generated from a luminance difference discriminating circuit 51 and 59, and when this deciding signal is generated, a delaying circuit 71 delays a time point for starting the integration of the photoelectric current, by a constant interval of time from when running of the shutter front curtain has been started.