kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. FOaA}D `] GR,2^]<{ I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. pP\Cwo #, I guess it define some vatied range for each coefficients but I don't know Japanese words. OY*y< | |