Hi Paul.
Did you want a drive or an EQ platform?
I use an EQ platform for my 10" dob, and is definitely accurate enough for lunar/planetary astrophotography. It would work just as well on a 12" dob.
Dave Pretorius uses dob driver II on his 10" dob, and again I think it would work just as well on a 12".
You can get Mel Bartel's, ServoCat or a number of other solutions for driving your dob. All of which would be accurate enough for planetary stuff.
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