| 摘要 |
The invention relates to a device for improving image quality in focussing screens of optical representation systems of a movie camera, having a movably mounted, translucent disk (4a, 4b, 4c) in a sandwich structure, a drive device (7) moving the movable disk in the plane of the disk and a stationary disk (5) mounted parallel to the plane of the movable disk (4a, 4b, 4c) with an image field marking (format marking 81, 82). The drive device (7) that is connected to the movable disk (4a, 4b, 4c) 7 moves the movable disk (4a, 4b, 4c) at least temporarily, for instance during the "standby mode" of the movie camera, at a frequency depending on the image frequency of the movie camera, the video frequency of a video reflecting device of the movie camera or motion picture camera or the brightness of the image or subject to be recorded or with a high motion frequency independent of the operating state of the movie camera.
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