| 摘要 |
A focus indicator system for a motion picture camera has video cameras mounted on opposite sides of the motion picture camera. Images produced by the video cameras are superimposed on the screen of a monitor. The video cameras are rotatable, and rotate in responses to changes in the focus of the lens. Movements of the lens' focus ring are detected by a transducer. A control circuit monitors the output from the transducer and operates a motor, which rotates the video cameras in opposite senses. The optical axes of the video cameras cross in the plane in which the lens is focused. The person operating as first assistant camera can determine when the motion picture camera is in focus by viewing the monitor. 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 to rapidly and accurately focus on objects in the camera's field of view. This reduces re-takes caused by inaccurate focusing and makes set up faster. This reduces production costs. |
