kimclps:使用說明書Chapter 2 page 26
'<D}5u72 The chief ray (or principal ray) from every field point will be iterated to pass
9,> Y through the center (x=0, y=0) of the stop surface, unless you override this behavior
ayz1i:Q| with chief ray aiming (this is only necessary in a few unusual sit ..
(2016-10-10 14:44) o?
"@9O?