Exposure controls for cameras

Claim 1

IN A CAMERA, IN COMBINATION, SHUTTER MEANS HAVING LEADING AND TRAILING MEMBERS BOTH OF WHICH ARE MOVABLE FROM COCKED TO REST POSITIONS, SAID LEADING MEMBER OF SAID SHUTTER MEANS MOVING FROM SAID COCKED TO SAID REST POSITION THEREOF IN ADVANCE OF SAID TRAILING MEMBER SO AS TO EXPOSE FILM AND SAID TRAILING MEMBER OF SAID SHUTTER MEANS THEN MOVING FROM SAID COCKED TO SAID REST POSITION THEREOF TO TERMINATE AN EXPOSURE; BLOCKING MEANS MOVABLE BETWEEN BLOCKING AND RELEASE POSITIONS AND WHEN IN SAID BLOCKING POSITION THEREOF BLOCKING MOVEMENT OF SAID TRAILING MEMBER FROM SAID COCKED TO SAID REST POSITION THEREOF; ELECTRICAL MEANS COOPERATING WITH SAID BLOCKING MEANS FOR MOVING THE LATTER FROM SAID BLOCKING TO SAID RELEASE POSITION THEREOF TO RELEASE SAID TRAILING MEMBER FOR MOVEMENT FROM SAID COCKED TO SAID REST POSITION THEREOF; AND MANUALLY OPERABLE MEANS OPERATIVELY CONNECTED TO SAID ELECTRICAL MEANS FOR PLACING THE LATTER IN A SELECTED ONE OF THREE POSITIONS, NAMELY, A B POSITION, AN AUTOMATIC POSITION, AND A FLASH POSITION, SAID MANUALLY OPERABLE MEANS WHEN PLACING SAID ELECTRICAL MEANS IN SAID B POSITION PROVIDING MANUAL DETERMINATION OF THE TERMINATION OF THE EXPOSURE SO THAT SAID ELECTRICAL MEANS IS ACTUATED BY THE OPERATOR TO DISPLACE SAID BLOCKING MEANS FROM SAID BLOCKING TO SAID REST POSITION AT AN INSTANT SELECTED BY THE OPERATOR IN ORDER TO MAKE TIME EXPOSURES, SAID ELECTRICAL MEANS WHEN PLACED BY SAID MANUALLY OPERABLE MEANS IN SAID AUTOMATIC POSITION AUTOMATICALLY DETERMINING THE INSTANT OF DISPLACEMENT OF SAID BLOCKING MEANS FROM SAID BLOCKING TO SAID RELEASE POSITION IN ACCORDANCE WITH THE LIGHTING CONDITIONS, AND SAID ELECTRICAL MEANS WHEN IN SAID FLASH POSITION AUTOMATICALLY DISPLACING SAID BLOCKING MEANS FROM SAID BLOCKING TO SAID RELEASE POSITION AFTER A PERIOD OF TIME SUITABLE FOR MAKING FLASH EXPOSURES.