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it looks like a polar alignment or tracking problem, how long do you spend getting your drift alignment right?
does it get worse with longer exposures?
an easy way to see if its a polar alignment problem or mirror shift though would be to put a bright star in the centre of a recticle ep and watch it like a hawk, if it slowly drifts off then its polar alignment if its a more sudden movement then its the mirror
edit: forgot to mention the stars might look round in the 100mm because its a shorter focal length and tracking doesnt need to be quite as accurate
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