Camera shutter which also functions as a diaphragm

Claim 1

IN A CAMERA, IN COMBINATION, A PLURALITY OF SHUTTER BLADES; A PAIR OF COAXIAL SHUTTER RING MEANS OPERATIVELY CONNECTED TO SAID SHUTTER BLADES FOR OPENING AND CLOSING THE LATTER, ONE OF SAID RING MEANS BEING A LEADING RING MEANS WHICH RETURNS FROM A COCKED POSITION TO A REST POSITION IN ADVANCE OF THE OTHER OF THE RING MEANS, WHICH IS A TRAILING RING MEANS, FOR OPENING THE SHUTTER BLADES TO MAKE AN EXPOSURE, THE TRAILING RING MEANS UPON FOLLOWING THE LEADING RING MEANS TO ITS REST POSITION RETURNING THE BLADES TO THEIR CLOSED POSITION; FIRST RETARDING MEANS OPERATIVELY CONNECTED TO SAID LEADING RING MEANS FOR RETARDING THE RETURN THEREOF TO SAID REST POSITION DURING THE ENTIRE RETURN MOVEMENT OF SAID LEADING RING MEANS AND WITH A RETARDING FORCE WHICH GRADUALLY INCREASES DURING RETURN OF SAID LEADING RING MEANS SO THAT INITIALLY SAID LEADING RING MEANS DURING THE RETURN THEREOF CAN ACCELERATE TOWARD ITS REST POSITION; AND ADJUSTABLE SECOND RETARDING MEANS OPERATIVELY CONNECTED TO SAID TRAILING RING MEANS FOR RETARDING THE RELEASE THEREOF, FOR RETURN FROM A COCKED TO A REST POSITION, TO AN EXTENT WHICH IS ADJUSTABLE FOR RELEASING SAID TRAILING RING MEANS BEFORE, AT, OR AFTER THE END OF THE RETURN MOVEMENT OF SAID LEADING RING MEANS.