Photographic exposure control system

Claim 1

IN A CAMERA, AN EXPOSURE CONTROL SYSTEM COMPRISING, IN COMBINATION: AN EXPOSURE METER INCLUDING A MEMBER AUTOMATICALLY DISPLACEABLE THROUGHOUT A RANGE OF POSITIONS AS A FUNCTION OF FIELD BRIGHTNESS; A FIRST EXPOSURE REGULATING DEVICE COMPRISING AN ADJUSTABLE LENS DIAPHRAGM; A FIRST MOVABLE CONTROL MEMBER COUPLED TO SAID DIAPHRAGM; A SECOND EXPOSURE REGULATING DEVICE COMPRISING AN ADJUSTABLE SHUTTER SPEED SETTING MEMBER; A SECOND MOVABLE CONTROL MEMBER COUPLED TO SAID SETTING MEMBER; AN ADJUSTABLE FILM SENSITIVITY COMPENSATING MEMBER; A THIRD MOVABLE CONTROL MEMBER COUPLED TO SAID COMPENSATING MEMBER; A FOURTH MOVABLE CONTROL MEMBER; SENSING MEANS MOVABLE WITH SAID FOURTH CONTROL MEMBER AND DISPOSED IN SENSING RELATION WITH SAID DISPLACEABLE MEMBER; FIRST AND SECOND DIFFERENTIAL MECHANISMS, EACH INTERCOUPLING A RESPECTIVE PAIR OF SAID CONTROL MEMBERS; MEANS INTERCOUPLING SAID FIRST AND SECOND DIFFERENTIAL MECHANISMS; AND MANUALLY OPERABLE MEANS FOR MOVING SAID FOURTH CONTROL MEMBER TO MOVE SAID SENSING MEANS INTO SENSING ENGAGEMENT WITH SAID DISPLACEABLE MEMBER, THEREBY MOVING AT LEAST ONE OF SAID FIRST AND SECOND CONTROL MEMBERS FOR ADJUSTING AT LEAST ONE OF SAID REGULATING DEVICES AS A FUNCTION OF FIELD BRIGHTNESS.