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Going back to the start of this thread. I have EXACTLY the same problem, the only thing our setups have in common is the 0.63 reducer. The loop that Alnitak produces on a long exposure is spectacular. I had it with the old 350D I used to use and still have it with the ASI294.
I am hoping to do some testing tonight if the sky allows, I might do a with/without reducer test on a bright star just at the edge of the frame.
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