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Its an HEQ5 with Astromecanicca motors and it easily handles the weight. The motors are superb and they are belt drive which so far has no discernible backlash. I have the backlash correction on the Astromecanicca controller set to zero on both axes. This mount happily takes the TAL 200K+bits at 15kg+ and a focal length of 1800mm and not one crook image due to guiding.
I also have an EQ6 with belt drive stepping motors and I hope to use this for a 12 inch or bigger astrograph I have yet to build. Minimising weight and windage is the key. I am working on it!
Bert
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