| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. #<G:& AoY!f'Z I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. }!"Cvu I guess it define some vatied range for each coefficients but I don't know Japanese words. Y=,9 M Still cannot know how to do that.
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