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The longer the focal length the more the seeing will wreak havoc. I did not know what was happening with my scope last year during a week of particularly bad seeing.
It would go out of focus from one focus subexpsoure to the next without changing the focus at all.
It is also highlighted when you use a small chipped camera as that creates a digital zoom effect and magnifies the seeing more.
So the moral of the story is widefield and large chips to be less affected by the seeing (also larger pixel sizes rather than smaller).
Greg.
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