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unless whatever your imaging is moving faster than say, 150 - 200kms an hour, going over 1/2000th will not make a difference...
With a 200mm lens (without IS) I would always attempt to keep the shutter speed above 1/250th for still objects, and 1/500th or so for moving... but I've never had a problem with 1/2000th bluring due to motion.
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