之前回家了,好久没登了,这个我也不知道 8C3k:
D[  
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。 io#}z4"'qY  
 Ln>!4i+-B)  
The fifth, seventh, etc., orders may also be computed from paraxial raytrace data. D$ds[if$U,  
Buchdahl develops specific equations by which the higher-order contributions may be C$w%!
jE  
calculated. The equations for the fifth-order contributions are very complex and are usu- {nmG/dn{  
ally calculated as part of a computer optical software package