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Frank, as Mark says 2-3 secs is about optimum for the average mount (some say 1, but I dont believe it), any faster and you are chasing seeing and guiding will get worse. The longer you go, the more averaged out seeing wobble will be, but also the more stable the mount needs to be.
I have an MOAG and its very stable. As with all things, the more you spend, the better they are and less need to upgrade later with heavier cams and bigger chips.
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