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Old 21-03-2015, 05:01 PM
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Rac (Raymond)
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Join Date: Dec 2012
Location: Whangarei, New Zealand
Posts: 120
Well you could make a sphere out of one of those blanks for testing the flat. I have thought about that myself. I have an old 8" f6 bk7 GSO mirror here that would be good for sacrificing for a secondary.
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