Photographic camera with automatic exposure control

Claim 1

IN A CAMERA, IN COMBINATION, AN EXPOSURE METER, A MOVABLE STOP MEMBER THE POSITION OF WHICH IS DETERMINED BY SAID EXPOSURE METER, A STEP-CAM MOVABLE TOWARD SAID MOVABLE STOP MEMBER TO SENSE THE POSITION OF SAID STOP MEMBER AND THEREFORE TO SENSE THE SETTING OF SAID EXPOSURE MEMBER, DIAPHRAGM MEANS INCLUDING A PLURALITY OF DIAPHRAGM BLADES AND TWO RELATIVELY ROTATABLE PLATES BETWEEN WHICH SAID BLADES ARE MOUNTED AND BY RELATIVE ROTATION OF WHICH THE DIAPHRAGM OPENING IS DETERMINED, A DIAPHRAGM BLADE OPENING MEMBER, COUPLING MEANS BY WHICH SAID BLADE OPENING MEMBER IS COUPLED TO SAID STEP CAM, WHEREBY SAID DIAPHRAGM OPENING IS AUTOMATICALLY ADJUSTED, AND A DIAPHRAGM SETTING RING, A CLUTCH MEANS INTERPOSED IN SAID COUPLING MEANS WHEREBY SAID DIAPHRAGM BLADE OPENING MEMBER MAY BE UNCOUPLED FROM SAID STEP CAM MEANS, A CAM SURFACE ON SAID DIAPHRAGM SETTING RING, AND MEANS OPERATED BY SAID CAM SURFACE ON SAID DIAPHRAGM SETTING RING WHEREBY SAID CLUTCH MEANS MAY BE SELECTIVELY ENGAGED OR DISENGAGED.