之前回家了,好久没登了,这个我也不知道 37AVk`a
在modern lens design英文第一版中329页中有个注释提到了这个。看来是用来计算higher-order contributions的。 Ts iJK
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The fifth, seventh, etc., orders may also be computed from paraxial raytrace data. +`y(S}Z
Buchdahl develops specific equations by which the higher-order contributions may be 1/_g36\l$
calculated. The equations for the fifth-order contributions are very complex and are usu- z^Q'GBoBA
ally calculated as part of a computer optical software package