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Hmm
I solely image with Newts 6 , 8 and 10
Maybe camera not sitting square in focuser or maybe some tilt ?
Is focuser travelling true both infocus and outfocus ?
Is your collimator and camera adapter the same diameter, say 2
Some collimators are 1.25 and if your camera is 2 then some offset might creep in
Are your subs centred ok and were your flats taken straight after your subs or next day ??
Cant think of anything else
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