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Yes, the effect occurs after about 1minute. It then slides away for one or two seconds. Then stays put after that. It's enough to ruin a long exposure. I am therefore limiting my subs to 30sec to avoid this occurance. I was thinking it could be the slew in the gears at a particular moment?? I was pointing almost at the zenith at the time. I've also heard to keep the scope 'east heavy' if this helps I have yet to try it...
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