Thread: HowTo: Secret of the Hartmann Mask... Revealed!
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  #25  
Old 15-11-2012, 02:40 PM
originaltrilogy (Petr)
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originaltrilogy is offline 		 
Join Date: Oct 2011
Location: Bathurst, NSW
Posts: 116
Is also good for collimating SCT!
http://preview.tinyurl.com/a5kcym7
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