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With going for a 10" newt and colmination.... it can be a right royal B4574R6... to figure out, but once you get your head around the light path and what your actually doing its a piece of p155...one thing to do though is get yourself something like a Cats Eye 2" XL series set, to get absolute collimnation.. you don't want to be a tiny bit off.! optical isn't so important. but photography is.
Brendan
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