Circuit arrangement for automatic an exposure time control provided for photographic cameras, in particular for one-eyed reflex cameras, with a in the image-side beam path of the objective photoresistor arranged for the measurement of the object brightness

摘要

A camera provided with electronic circuitry for automatically determining the extent to which film in the camera is exposed. The electrical circuitry includes a photosensitive element for converting light intensity into a given electrical signal. Also, the electrical circuitry includes a closed loop circuit which forms that part of the electrical circuitry which determines the influence of the light intensity on the extent of the exposure of film which is automatically obtained. This closed loop circuit enables the exposure to be obtained in part according to the light intensity without any influence from the particular characteristics of the photosensitive element.