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Old 26-10-2014, 01:36 PM
Rob P
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Rob P is offline
 
Join Date: Dec 2009
Location: Brisbane, Australia
Posts: 125
This works nicely on my 120mm refractor, and it may be possible to transfer to your dob; but I just move the scope around until I have the smallest, sharpest shadow behind the scope. A variation on the sundial method described by Glen.

Good luck
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