Exposure control apparatus for camera with interchangeable lens

Abstract

A camera comprising a detecting device capable of mounting an interchangeable lens having a signalling device for transmitting information of the fully open aperture of the lens to the camera and a diaphragm adapted to be controlled from said camera at the picture taking operation and further capable of detecting said information of the fully open aperture, and an exposure control device capable of calculating a combination of a diaphragm aperture and an exposure time for the exposure control at the picture taking operation from information of an object light received through the interchangeable lens and correcting the combination by means of the information obtained from the detecting device, or an exposure control device comprising a calculating circuit for calculating a combination of a diaphragm aperture and an exposure time for the exposure control at the picture taking operation from information of an object light received through said interchangeable lens and the information obtained from the detecting device. The detecting device comprises means for producing an electric output signal corresponding to the information of the fully open aperture in engagement with the signalling device upon mounting of such interchangeable lens, or an electric output signal corresponding to a particular diaphragm aperture upon detection of the absence of the engagement.

Dependencies are inferred from the claim text.