Hi Carl,
I have a 6" newt with a 70mm guidescope side by side etc on the Gm-8 and after I fixed most of the flex probs I can usually manage up to 8 min subs maybe longer..Total weight would be about 11kgs..with a extra counterweight I have no probs with the mount at all. Could easily go to the max 15kg I reckon..imaging at 850mm by the way...
cheers
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