Could be Tim. At high power viewing planets I can see the mount visibly drifting back and forward constantly. The mount has been adjusted and greased with new grease. Mount weight and camera come to 15kg, right on the quoted max.
I don't have the $ for a heavier duty mount yet. Not for quite a while. But I'll give guiding a go soon with a finder / guider and see if that helps. My present 68mm guidescope is too heavy.
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