Abstract: A camera for taking pictures, comprises a viewfinder masking device having three different format mask configurations; a manual picture-format selector having three different format selection settings which correspond respectively to the three different format mask configurations in order to select any one of the three different format mask configurations; and a default reset for returning the selector to a predetermined one of the three different format selection settings and returning the viewfinder masking device to a corresponding one of the three different format mask configurations, when the selector is in any one of the selection settings that is not the predetermined one, after a picture is taken and before another picture is taken.

Abstract: An iris diaphragm comprises a stationary circular base having a pair of opposite sides and pivot pins at only one of the sides, a plurality of opaque blades positioned adjacent the side of the circular base that has the pivot pins to define an aperture between the blades, and having pivot holes that contain the pivot pins to permit the aperture to be changed in size by pivoting the blades about the pivot pins, a rotatable ring positioned adjacent the side of the circular base without the pivot pins, and a plurality of interconnections between the ring and respective ones of the blades to make rotation of the ring relative to the circular base pivot the blades about the pivot pins.