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关于ETVA的计算


yuan.chen
Zemax Staff
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ETVA取的是当前表面以及其后表面某一特定点的Z坐标进行计算,根据模式的不同会选取其净口径或者机械半直径进行相关计算。如果希望能够控制镜片或者空气的距离大于某个特定值,FTGT可能更加合适一些。

How to constrain the thickness of aspheric components – Knowledgebase (zemax.com)

特别要注意的是,镜片口径会对数值计算产生影响。下面展示三种不同口径设置对于ETVA操作数数值产生的影响。ETVA = Z2-Z1。

 

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