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Ok, tilt was related to the OAG - a bit, but the major culprit was user error - I forgot to put the field flattener on. That made a bit of a difference.
Unfortunately, still not there yet as I have to adjust the back focus. The Celestron OAG I am trying out is using up too much of the back focus. I suspect I will need to go back to the TS OAG to make it all fit correctly.
I'm taking a few shots of M16 now, mostly to see how the tracking goes over a longer time.
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