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Answer: 1, seeing.
You might be hard pressed to make out the Casini division in the 80mm, but in the Mak it should be a cake-walk. My C5 never had a problem with it at its current angle, except in poor seeing.
Try the Mak again, but with the 8mm. If seeing is good you should have no problem with it. It had sufficient resolution to make it out ok. I had a C9.25 up until a month ago, and it too struggled, but only when seeing was poor.
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