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Field rotation can be compensated for in the stacking software, so I am no too worried about that.
Sounds like an EQ platform is the way to go cost wise.
I am also toying with the idea of designing a fork mount for the Dob that would only need an RA drive. I have a stack of old stepper motors and small servo motors and it would be easy enough to make up a driver board.
I will need to build an observatory to permanently house it if I do the latter, but the platform is portable.
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