| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. .[s2zI *nTU#U I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. r/:%}(7; I guess it define some vatied range for each coefficients but I don't know Japanese words. >cR)?P/o Still cannot know how to do that.
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