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At first glance it looks like walking noise caused by some field rotation as a result of poor polar alignment.
It doesn’t look like an optical error in your image train ( I’m a Newt user not a refractor user so others may chime in to confirm that )
How is your Pa error ?
When guiding was the Ra error similar to Dec error or Dec was substantially larger ?
Did you dither your subs with enough pixels ? Dithering is an absolute must in AP
Another possibility is calibration issues but that would generally not cause a circular pattern
Hope others offer more suggestions / advice
Cheers
Martin
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