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Collminating a Newtonian focuser
Does anyone have an easy way to collminate a focuser on a newt?
I've just put a moonlight on a 10" dob and basically used a set of calipers to estimate the focuser center, removed the secondary and pointed the focuser at the estimated spot on the other side of the tube. It was out quite a bit.
Is there a better/more accurate way to do it?
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