Hi Mark.
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and for that matter why post Figure XP data to a forum when you say that in fact the mirror was `much worse '.
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Any particular reason you are complaining about this here and not on the forum that it was posted to?
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I've certainly looked at optics from this maker and never seen any surface roughness that would remotely prevent some reasonable quantification of its surface errors .
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Have you ever seen a mirror this rough from this maker?
Dave