Through focus MTF ??

<>Hi </P>
<>In zemax , there are some stranger commands in the "analysis menu".</P>
<>That is , I find there are three strange command : 1.FFT through focus MTF 2.Huygens through focus MTF 3.Geometrical through focus MTF , how to using these command ? is there any difference between them ?</P>
<> em06</P>

帮助分析在焦深范围内传函的变化。

<P>一般来说,我们设计时,选择的像面是高斯像面,但是这个焦面的MTF,就整个系统而言不一定是最好的,这可以从波像差的定理推倒出来.</P>
<P>因此有时候为了得到最好的MTF,或者说波像差,我们往往选择离焦,从而得到最小的波像差,在ZEMAX里可以在TOOL中实现!</P>
<P>可以看几何光学里的离焦!</P>
<P>你应该能更了解它的含义！</P>