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To add to Martins comments, Have you got periodic error? have you trained your mounts periodic error?
On Polar alignment, You can still have great polar alignment but still see drift, this is because of atmospheric refraction (more at lower altitudes) and because of tube flexure. If you're not using a mount model like Tpoint and Protrack to correct for these things, you are likely to still see drift in an unguided exposure. Of course, it will vary depending on altitude of the subject and the stiffness of your setup.
Cheers, Joshua.
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