MTF optimization by “User-Defined Constraint”

When I use MTF error function type, I can get different MTF distribution of different fields by changing the weights of MTF in different fields, but I can’t get exact MTF value I want. How can I optimize MTF by using “User-Defined Constraint” ?

MTF优化并不能得到精确的数值，因为有多个像差在平衡，你的系统必须有能力达到你的目标值。

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<P 0cm 0cm 0pt">Thanks a lot.  In addition, could it be possible to write a macro (“User-Defined Constraint” type) to calculate MTF?</P></FONT>