Principles of cinematography : a handbook of motion picture technology (1953)

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THE CINEMATOGRAPH CAMERA 67 % OBJECTIVE LENS 1 1 t— J I 1 ' 1 LENS ,—Skess^U, ■ ■ 'V Fig. 24. — Metro-Goldwyn-Mayer "follow-focus" device. any object seen to be in critical focus through the viewfinder will also be focused on the film. A second cam, operating as suggested at *E\ will cause the viewfinder mount to rotate about the optical centre indicated at 'B\ This action may also be calibrated to rotate the viewfinder in step with the change in focusing, thereby keeping the image seen in the viewfinder always equal to the field covered by the objective lens. As mentioned previously, mirror shutters set at 45° to the optical axis overcome completely this problem and are now incorporated in many cameras. Modern Methods of Scene Identification In modern film production it is quite common to require four or more separate mechanisms to be operated in synchronism throughout the complete filming of one scene. Such an instance would be when a background projection shot is being made. Background projection is the name given to a system in which a large trans Fig. 25. — Set up for background projection shots.