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1·The system aperture, often the entrance pupil or the aperture stop, limits the rays that can enter the optical system from the defined field.

系统孔径，常指入瞳 （entrance pupil） 或孔径光 （aperture stop），它限制可从已定义视场入射光学系统的光线。

2·The projection optics is designed for a constant field angle and entrance pupil. Thus image always fills entrance aperture and view field of the test optical system.

从光学指标的确定，结构、材料的选取到最终光学性能，阐述了准直投射光学系统的设计。