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 （aperturestop），它限制可从已定义视场入射光学系统的光线。

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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。

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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。

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