Automatic exposure control for multiple-objective motion picture cameras

911,861. Kinematograph cameras. AGFA A.G. May 4, 1959 [May 20, 1958], No. 15267/59. Class 97 (1). [Also in Group XL (b)] A kinematograph camera, or a unit adapted for attachment thereto, has a plurality of objectives mounted with an automatic diaphragm control device on an objective plate which is movable to bring each objective in turn into the exposure position, and the diaphragm control device is linked with means providing a variable aperture for each objective. Turret plate 4, Fig. 2, is rotatably mounted on front plate 1 of cinÚ camera 1 and a cap 7 is fixed to the turret plate by bayonet joint 6. The cap carries objectives 8, 9 and a window 10 for photo-conductive cell 18 which is in circuit with battery 19 and galvanometer 20; the armature 23 of the latter causes scissor-like movement of levers 27, 28, Fig. 3, to vary apertures 34, and moves pointers 49 over scales 50, indicating diaphragm setting and incident light intensity, in view-finder windows 11, 12. Operation of release member 45 against action of tension spring 47 causes contact 40 to close the photo-electric circuit before the camera running mechanism is actuated.