Thread: Mirror Quality for Imaging?
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Old 17-08-2014, 06:42 PM
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Bassnut (Fred)
Narrowfield rules!

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Join Date: Nov 2006
Location: Torquay
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Quote:
Originally Posted by alpal View Post
There is still a nagging question:

So why were some of the ( now no longer produced ) RCOS scopes ion milled to 1/100th wave accuracy?
Really, really dark and stable skies
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