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The better tracking with the refractor may help resolve the stars better, and the longer focal length too even though the 6" goes deeper.
I can't imagine doing 10 hour total time with 30 second subs though. That would kill a DSLR after a few DSO's. Even 1 minute subs are a bit short. But then, I need a new camera anyway. May as well wear out what I've got first.
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