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I'm pretty sure you can't connect guide errors as there is no input into the dobs... increased aperture doesn't equal shorter exposures it means more resolution. the focal ratio really dictates exposure time.
they track pretty well when setup properly depending on how far away from the zenith and pole it is. i could get 30 seconds but found it more consistent to do 20 second exposures. any longer and the field rotates (unless you were at the north or south celestial pole).
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