kimclps:使用說明書Chapter 2 page 26
R*zBnHAb! The chief ray (or principal ray) from every field point will be iterated to pass
[]sB^UT through the center (x=0, y=0) of the stop surface, unless you override this behavior
~t1O]aO( with chief ray aiming (this is only necessary in a few unusual sit ..
(2016-10-10 14:44)
)@sJTAK