kimclps:使用說明書Chapter 2 page 26
nzi)4"3O The chief ray (or principal ray) from every field point will be iterated to pass
=5p?4/4 J through the center (x=0, y=0) of the stop surface, unless you override this behavior
oM}P Wf- with chief ray aiming (this is only necessary in a few unusual sit ..
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