| kendall |
2017-08-11 11:48 |
Sorry, my PC cannot type chinese now, crazy. 9qN4f8R ZycV?ob8} I saw some Japanese engineers use "primary differential and second differential" to define the extended freeform optical surface tolerance. $2B_a I guess it define some vatied range for each coefficients but I don't know Japanese words. E}AOtY5a Still cannot know how to do that.
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