Thread: Weird concentric rings with PST and barlow.
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  #8  
Old 02-04-2012, 04:11 PM
Poita (Peter)
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Join Date: Jun 2011
Location: NSW Country
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Ah, now I get it.
Thanks for the replies.
I'll try doing a flat, but I think I will not be using this barlow with the PST.
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