Abstract: A focal-plane leaf shutter for photographic cameras, comprises an opening group of leaves and a closing group of leaves, each group having a main leaf which forms a parallelogram linkage with a pair of carrier levers, and secondary leaves. The main leaves serve to define an exposure aperture. The carrier levers are mounted by means of stationary pivot journals on a plate at one short side of the exposure aperture and the main leaves are pivotally connected by means of bearing journals to the free ends of the carrier levers. The secondary leaves are connected with the carrier levers at intervals between the pivot journals and the bearing journals. The two innermost carrier levers forming parallelogram linkages with the main leaves are mounted on a common pivot journal.

Abstract: A monocular reflex camera having a viewfinder mirror and carrier assembly movable between a viewing position of the camera and an exposure taking position comprises a pivoted crank arm of which the pivot shaft is articulated connected with the mirror carrier close to the centre of gravity. The carrier has a lateral stop lug arrange at a distance from the pivot shaft and protruding into the path of the movement of the crank arm. A spring urges the stop lug into abutment with the crank arm. Stops are provided for locating said mirror assembly in the exposure taking position, and also in the viewfinding position. During the viewing position of the mirror and over a substantial portion of its travel into the exposure taking position, the lug is maintained in engagement with said crank arm by said spring and on arrival at the picture taking position the lug disengages the crank arm against the action of the spring.

Abstract: A monocular reflex camera having a device for adjusting the viewfinding position of a viewfinder mirror of which the pivot spindle is arranged in crankshaft manner in the camera housing, the viewfinder mirror being urged by a spring in the viewfinding position against first and second stop devices. Each stop device consists of a stop and a flat face arranged opposite to the stop. The flat faces of the two stop devices are arranged either on a setting carrier in the camera housing or on the mirror carrier. The flat faces of the two stop devices extend in mutually parallel planes. The first and second stop devices are shiftable both in relation to one another for the adjustment of the oblique position of the viewfinder mirror and in common for the sharp focussing of the viewfinder image.