| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. QjlQsN! !-veL1r I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. +,Ud 3iS I guess it define some vatied range for each coefficients but I don't know Japanese words. *SK`&V Still cannot know how to do that.
|
|