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Hi David,
I'm rarely able to use magnifications over 200x with my 8" SCT as well. In my case the mirror temp and conditions seem to be the problem as Paul has stated. I have seen Saturn and Jupiter using a barlowed 9.7mm ep in amazing detail on rare occasions from home this rules out a collimation problem for me. The hardest part is snagging a good night in the tropics for collimation. Good luck mate see you soon.
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