kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. ~<O.Gu&"R pU<J?cU8N I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. K5T1dBl,0 I guess it define some vatied range for each coefficients but I don't know Japanese words. T+zhj++ Still cannot know how to do that.
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