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Everard, I used to have a 10" LX200 SCT, with a focal length of 2500mm. My current scope has a 20" mirror, but has an identical focal length of 2500mm.
I find the seeing limitations are not dissimilar. Perhaps I push the Mary Rose a bit harder with higher mag because the image is brighter, and so it can withstand a bit more power for DSOs, but star images are just as degraded at the same power due to seeing conditions.
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