Abstract

A system for responding to non-uniform scene brightness. The system includes a plurality of photosensitive devices which are capable of receiving light from different parts of a scene while remaining static with respect thereto. Through an electrical connecting structure these photosensitive devices are all electrically connected with an output structure which will provide an output determined by at least one of a pair of the photosensitive devices which are respectively exposed to light of maximum and minimum brightness from the scene. The plurality of photosensitive devices provide inputs which vary according to a geometric progression in accordance with the variation in light brightness. The electrical connecting structure, however, changes the geometric progression in the variation of the inputs from the plurality of photosensitive devices to an arithmetic progression so that at the output device there is achieved an output which varies according to an arithmetic progression, in this way enabling the output to be used directly for photographic purposes.