Photographic exposure control system utilizing a single photocell for three distinct purposes

摘要

A photographic camera apparatus includes an improved exposure and electronic flash fire control system comprising a single photoresponsive element. The system provides a scene brightness measurement prior to a photographic exposure interval, an exposure influencing event during the exposure interval responsive to the photoresponsive element providing an indication of the commencement of the photographic exposure interval and an exposure terminating signal responsive to the photoresponsive element detecting a selected amount of scene light corresponding to the exposing scene light admitted during the exposure interval.