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Gday Al ...welcome back....i go through the dift aligning procedure , was a chore at first but its straight forward now that when i have the scope set up for imaging i always do it . I have never tested how a relatively rough polar alignment affects piggyback shots with different lens , i think to at different points in the sky you get bizzare feild rotation rates so i think to avoid frustration getting your dift alignment to a point where a star doesnt move off a reticle line for 5 minutes will yeild good results for you.Good luck with the endevour and update your progress here to and welcome again.
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