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[ATM] BK7 Glass

I got a quote for two 60mm blanks, each one with a flat surface but it's way too much expensive. So I will have to polish flat surfaces myself. Instead of making them flats I could make a long radius concave and a matching convex, this would do the job.

So in your opinion, is it easier to make 2 flats or matching concave/convex ?

Jonathan
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