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本文首先分析讨论了70mm大画幅光学补偿器所面临的主要问题,指出了现有各种光学补偿器作为大画幅补偿器时遇到的困难。第二部分提出了一种新型的输片轮内嵌旋转棱镜两次成象大画幅光学补偿器,该补偿器有效地解决了70mm大画幅所带来的问题。文中对该补偿器的参数计算及优缺点作了分析讨论。最后叙述了补偿器实验,在快门系数1/5,相对孔径D/f′为1/10时,画幅中心摄影分辩率为40对线/毫米。
This paper first analyzes and discusses the major problems faced by 70mm large format optical compensators, and points out the difficulties encountered when using various optical compensators as large format compensators. In the second part, a new type of double-image large-format optical compensator is proposed, which is a new type of rotary wheel built-in rotary prism. The compensator effectively solves the problems brought by 70mm large format. In this paper, the parameters of the compensator calculation and advantages and disadvantages of the analysis were discussed. Finally, the compensator experiment is described. At a shutter speed of 1/5 and a relative aperture of D / f of 1/10, the center resolution of the frame is 40 pairs of lines per millimeter.