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I will just throw in Focal length...from my short experience so far.....it is all relative to Focal length and what you want to image....My EQ6 with Skyscan has backlash and I dont even have to polar align it when imaging with my 20DA on the ED80 at 600mm focal length...it will guide correct enough for that focal length of imaging.
Then to my G11 imaging between 2000-2800mm everything has to be spot on to guide or you get star trails.....so I would be looking at the scope first and what you want to image at what focal length then buy the mount to suit.
For example I dont see the point of a G11 mount or up for say imaging at 600mm with a DSLR....you get just as good job with EQ6 or even a HEQ5.....my opinion.
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