belichtungssteuerschaltung for a camera with ttl light metering and automatic ttl flash

摘要

An automatic exposure control circuit for a TTL automatic electronic flash for use with a camera having an electronic flash controlling capability and capable of photometry of reflection from a film surface performs photometry of stationary light until a shutter is fully open and then controls an emission of flashlight when the shutter is fully open and subsequently controls again photometry of stationary light after termination of the flashlight so that a ratio of the stationary light to the flashlight in light quantity can be an appropriate value.