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It'll want to be a damn big and chunky EQ to start with. EQ6 would probably stuggle a bit for astrophotography with a 12" OTA sitting in it. For stability alone I would consider getting proper tube rings and dovetail to suit, rather than cobble one together out of wood.
What's the 6" scope your using? If it's a reflector and you are looking at getting into DSO imaging then you could certainly do a lot worse than starting there. 6" is plenty of aperture to start with. The bigger your scope the more robust your mount needs to be. An eq6 would handle a 6" relfector np at all. A 12" though would be a real struggle astrophotographically speaking. Not even sure a Losmandy G11 would be suitable. It might carry the weight for astrophotography, probably, but the lever arm movement would be too much for it I would think.
If it's a good 6" start with that.
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