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Re Aperture: 2 arc second seeing will result in a many more arc second 'spludge' on the ccd due to the scintillation. The resolving power of the larger scope should still come into play in producing a smaller star image all things being equal.
As a general rule, I would be planning for a perfect night, not a rubbish one - we get plenty of those. When the conditions are just right you need the best equipment you can stretch to so that you can make it stick, and I'm sorry, that means selling your car...
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