[求助]有关Grid Distortion的问题 [复制链接]

大家好！ Id .nu/  
有关Grid Distortion的问题，我设设计超短焦距投影镜头的时候，我发现Field Curvature and Distortion Plot和Grid Distortion相差很大，Grid Distortion在选择最大视场是畸变为33%，尓Field Curvature and Distortion Plot里的Distortion在-2%到+2%之间，见图，有渐晕。 IY\5@PVZ  
#rfiD%c  
请问：我怎么用优化算子优化呢！ />pI8 g<  
<)c)%'v  
DIST、 DIMX、 DISC、 DISG我都用了，还是不行，望大家给予指导！谢谢！ 0gr/<v  

仔细查阅zemax的定义的畸变和网格畸变

畸变没有问题

Grid Distortion视场选择有问题

Zemax裏的說明，Grid Distortion不適用於field為real image height及半視場角>=90度的情形。 R8Fv{7]c  
樓主是否正好是這種情形? Cjlk  
z5*'{t)  
ZEMAX cannot compute the distortion in the manner described here if the field type is real image height. The reason is that when using real image height, ZEMAX iterates each ray trace to find the exact field coordinate to hit the desired image coordinate; implicitly removing the distortion. As a workaround, ZEMAX automatically changes the field type from real to paraxial image height for the purposes of this computation. This change is significant if the distortion is large. Note the value for "Field Width" will then be in units of paraxial image height rather than real image height. M&9+6e'-F  
T!)(Dv8@F  
Grid distortion can not be calculated if the field units are angles and the maximum angle equals or exceeds 90 degrees. This limitation is due to the assumption that the predicted image height is proportional to the tangent of the field angle in object space. When the field angle exceeds 90 degrees, the tangent does not predict the linear image height correctly. H9Q&tl9  

谢谢各位的帮助， 我再好好理解理解

已经很不错了啊

了解先

f-theta镜头如何优化