| 摘要 |
A focus indicator system for a motion picture camera (20) has two video cameras (38), one mounted on each side of the motion picture camera (20). Images produced by the video cameras (38) are superimposed on the screen of a monitor (42). The video cameras (38) are pivotable, and rotate in responses to changes in the focus of a lens (26) of the camera (20). Movements of the len s' focus ring (28) are detected by a transducer (52). A control circuit monitor s the output (152) from the transducer (52) and operates servomotors (55) whic h rotate the video cameras in opposite senses. The optical axes (43) of the video cameras (38) cross in the plane in which the lens (26) is focussed. Th e person operating as first assistant camera can determine when the motion picture camera (20) is in focus by viewing the monitor (42). When an object is in focus, the superimposed images from the video cameras coincide. When the object is not in focus the superimposed images are separated. The focus indicator helps the person who is focussing the camera (20) to rapidly and accurately focus on objects in the camera's field of view. This reduces re- takes caused by inaccurate focussing and makes set up faster. This reduces production costs.
|
