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At the moment l've got a 10" skywatcher and my ed 80 hooked up, see 'send in a shot of your rig' l really can't comment on the photography side of it, l've only done some still short exposure moon stuff, as l've mentioned before l have an extra weight on my balance bar and to be honest l think it is a very stable set up when using the dual axis drive there is very very little backlash when driving has stopped, virtually none that l can see visually, given all this it is sitting on a very heavy rigid pier. One thing l will mention is that most of the periodic error is in the gear box so when you fit a go-to consider the astromeccanica set up which has the motors turned around and drives direct to the gears.
Hope it helps a little.
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