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Originally Posted by Wheeler
Correct me if I'm wrong, but isn't the IS on the 70-300 just for static shots as opposed to the more sophisticated two mode version of IS on the 100-400/70-200 etc? If this is the case, isn't it better to switch it off when tracking moving objects?
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The IS on the latest 70-300 IS and the DO version are an upgraded version of the IS on the 100-400 lens you mention. They are supposed to give "up to 3 stops" rather than 2 stops and detect when the lens is on a tripod so you don't have to turn the IS off in that situation although still advised to. I wonder if there is any difference in practice?