出瞳，光学系统的孔径光阑在光学系统像空间所成的像称为系统的“出瞳”。出瞳的位置（由出瞳距离表示）和直径（由出瞳直径表示）代表了出射光束的位置和口径。
或者，你还可以将目镜的焦距除以望远镜的焦比来得到出瞳尺寸。
Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope.
本测试系统是为解决某单位枪用光学瞄具出瞳直径、出瞳距离的测试而研制的。
This measuring system is specially designed to solve the diameter and distance of exit pupil of the gun optical sighting for some factory.
该方法亦可用于分析光学系统出瞳振幅分布，数值计算其他焦面处的光强分布。
Furthermore, the approach can also be used to analyze the amplitude in the exit pupil of a camera lens and calculate the light intensity distribution on other focal planes.
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