同时分析了参考平面移动的条件，指出参考平面的移动必然伴随着光阑位置的移动。
The reference plane should be shifted with the moving of the aperture in the element.
进一步研究变焦距系统远心光路的结构特征，得出了使系统在整个变焦过程中都处于远心位置的光阑轴向位移方程。
To study the structure of telecentric beam path for zoom lens system, the axial displacement equation for the stop was deduced, which keep the system telecentric in all zoom position.
为了减少视场倾斜，提高成像质量，必须确定掠入射角和确定光阑的位置。
In order to reduce the inclination of the field of view (FOV) and improve the image quality, it is important to determine the grazing incident Angle and the position of stops.
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