| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. Kjz,p^Y\ !Z=`Wk5 I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. `dL9sfj> I guess it define some vatied range for each coefficients but I don't know Japanese words. z[t$[Qg Still cannot know how to do that.
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