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HI Suavi, Flexure is a possibility.
No ring, just ext tube and last night, I failed to lock down the focus tube after focusing, so there could have been movement there.
I have a 50mm finderguider, so I could try that tonight.
I am interested to see if I still have issues tonight.
I have attached a 100% crop of a 5 min sub from last night to show the shape of the stars.
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