Thread: Newtonian reflector - GEM contortions
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Old 12-10-2009, 10:31 PM
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peter_4059 (Peter)
Big Scopes are Cool

peter_4059 is offline 		 
Join Date: Jun 2007
Location: SE Tasmania
Posts: 4,573
you need a set of these:

http://www.parallaxinstruments.com/ring.htm
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