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I have the 10" ACF, and you really do need to add a crayford focuser to it if you want great focus.
I have had the 10" and 12" side by side, and for visual on that night, there wasn't really a perceivable difference, and it won't be drastic for imaging, but the 12" will require a substantially beefier mount.
If I was going to get a mount that size, I'd pony up for a 2nd hand C14 instead and be done with it.
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