之前回家了，好久没登了，这个我也不知道 ,7os3~Mk9
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。 _%@ri]u{ov
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The fifth, seventh, etc., orders may also be computed from paraxial raytrace data. (X/dP ~
Buchdahl develops specific equations by which the higher-order contributions may be V]W-**j<
calculated. The equations for the fifth-order contributions are very complex and are usu- cL+bMM$4r~
ally calculated as part of a computer optical software package
