| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. HNFG:t9 y;'yob I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. .?<M$38fv I guess it define some vatied range for each coefficients but I don't know Japanese words. <FaF67[Q Still cannot know how to do that.
|
|