SYSTEM AND DEVICE FOR CORRECTING APERTURE CONTROL OF INTERCHANGEABLE LENS TYPE SINGLE-LENS REFLEX CAMERA

PURPOSE:To perform high-precision control by performing automatic aperture control by compensating by a simple mechanism a difference in open-aperture value among individual lens mounted on a camera body interchangeably and the illuminance error of a film surface due to variations in illuminance of the film surface with respective lenses. CONSTITUTION:When the operation of an aperture driving member at a camera body side where the open-aperture value of a reference lens A and values equivalent to deviations from those errors are controlled through the operation of an exposure control circuit is relayed to aperture blades at a lens side, different open-aperture values characteristic to interchangeable lens A, B and C, the illuminance error of a film surface at the open-aperture values, and an illuminance error generated relating to the position of a photodetection part are corrected as the extent of a previous run which does not relate to light-quantity control effect by stop-down metering in the process of transferring operation to the aperture blades by the aperture driving member.