Abstract: A suction film holder preferably for a reproduction camera and comprising a plate with channels opening outwards and communicating with a suction means. The known suction holders comprise a plurality of concentric chambers mutually communicating through valves, only the intermediary chamber being connected to the suction source. The sheet in question may therefore neither be of an arbitrary size nor be arbitrarily located. According to the invention the channels uniformly dispersed across the entire plate are individually connected to the suction means through at least one valve, said valve closing when a heavy flow takes place and slightly opening when substantially the same pressure is present on both sides thereof. In this manner the sheet may have an arbitrary size and be arbitrarily located. A plurality of channels always open on to the back of the sheet, the valves of said channels slightly opening when substantially the same pressure is present on both sides of the valve, i.e.

Abstract: A method of adjusting a picture reproducing apparatus such as for instance a camera, which comprises an original plane, an objective plane, and a picture plane, by means of driving means in the form of direct-current motors. The motors are controlled by means of voltage pulses, each motor being stopped after each supply of pulses, and the width of the pulses being regulated in response to the voltage across the motor in question. The direct-current motor thereby replaces a stepping motor.

Abstract: A reproduction camera having a movable table which at two adjacent corners is guided in two vertical guides on the frame of the camera and moved by an endless cord which is passed over cord pulleys arranged above and below said guides, the endless cord being further passed over a winding drum and connected to the said movable table in such manner that the two connecting points are moved in the same direction when the cord is moved, whereby a very exact translatory movement of the table is obtained by a very simple mechanism which is easy to manufacture and to operate.