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I have split Antares in both my 8" F6 Dobs. Seeing and tube currents appear to be the most important factors. My solid tube Dob splits it OK at 200X and above when the seeing is good altough always looks a little "messy". However, in my stringscope, when the seeing was good several weeks ago, for 3 nights in a row, I noted a beautiful split at 142X and up with very tight star images and well defined separation between the 2 components. I found it a beautiful sight. I don't know that the mirror is anything special in this scope, I put it down to good seeing, the lack of tube currents and the primary mirror boundary layer fans.
Last night BC came around with his new 10" GSO Dob. The seeing was only average at best. We could split Antares in both the 10" F5 GSO and the 8"F6 stringscope it was a "messy" image and the companion was only visible intermitently at 212X and it helped to know where to look. Not much fun to look at.
Cheers,
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