之前回家了,好久没登了,这个我也不知道 IL&R&8'
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。 $\oe}`#o
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The fifth, seventh, etc., orders may also be computed from paraxial raytrace data. Ka{QjW!%d<
Buchdahl develops specific equations by which the higher-order contributions may be R=NK3iGT f
calculated. The equations for the fifth-order contributions are very complex and are usu- hsws7sH
ally calculated as part of a computer optical software package