Adjustable diaphragm with indicia thereon

Claim 1

A PHOTOGRAPHIC CAMERA HAVING A HOUSING, SHUTTER MEANS AND DIAPHRAGM MEANS INCLUDING AT LEAST TWO DIAPHRAGM ELEMENTS MOVABLE RELATIVE TO SAID HOUSING, SAID ELEMENTS HAVING FIRST COOPERATING CONTOURS WHICH DEFINE THE EFFECTIVE EXPOSURE APERTURE SIZE; MANUALLY OPERABLE ACTUATOR MEANS FOR ADJUSTABLY MOVING SAID DIAPHRAGM ELEMENTS SIMULTANEOUSLY IN OPPOSITE DIRECTIONS; INDICATING INDICIA CALIBRATED IN TERMS OF SUBJECT DISTANCE FUNCTIONALLY RELATED TO THE CORRECT EXPOSURE VALUE OF SAID SHUTTER MEANS WHEN THE SUBJECT IS UNDER FLASH ILLUMINATION, SAID INDICIA COMPRISING FIRST INDEX MEANS ON ONE OF SAID DIAPHRAGM ELEMENTS COOPERATING WITH SECOND INDEX MEANS ON ANOTHER OF SAID DIAPHRAGM ELEMENTS AND OBSERVABLE BY A USER WHEN MANIPULATING SAID ACTUATOR MEANS; SECOND COOPERATING CONTOURS ON SAID DIAPHRAGM BLADES THAT DEFINE A PHOTOMETER APERTURE; AND PHOTOMETER MEANS PROVIDED ON SAID CAMERA, SAID PHOTOMETER MEANS BEING RESPONSIVE TO THE AMOUNT OF LIGHT PASSING THROUGH SAID PHOTOMETER APERTURE FOR INDICATING TO THE USER WHEN MANUAL OPERATON OF SAID ACTUATOR MEANS HAS ADJUSTED THE DIAPHRAGM ELEMENTS TO PROVIDE THE EXPOSURE APERTURE THAT IS CORRECT FOR THE AVERAGE INTENSITY OF THE SCENE BEING PHOTOGRAPHED UNDER STEADY LIGHTING CONDITIONS WHEREBY UNDER STEADY LIGHTING CONDITIONS THE USER WOULD OPERATE SAID ACTUATOR MEANS UNTIL SAID PHOTOMETER MEANS INDICATE THAT THE EXPOSURE APERTURE IS CORRECT FOR SUCH CONDITIONS AND UNDER THE FLASH ILLUMINATION CONDITIONS THE USER WOULD OPERATE SAID ACTUATOR MEANS UNTIL SAID INDEX MEANS INDICATE THE DISTANCE OF THE SUBJECT TO THE CAMERA.