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Thanks for the replies. I ran guiding assistant after calibrating in PHD2 and it reported a 2.3 arc minute polar alignment error so I didn't actually do a drift align thinking I probably couldn't realistically improve on that anyway.
I did do a 10min sub of the Trifid and it came out rather nicely so it is hard to think the polar alignment is way out but maybe the guiding was in fact just continually compensating for it.
I will run the drift align tool next time and see what it reports. I note NINA has a 3 point polar alignment tool as well that I could try.
Brett
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