Originally Posted by wusstigphoto
Not true, actually. The IS system in the EF-S 17-55mm and the other (relatively) newer IS lenses senses that the camera is on a tripod, and fixes itself in the centered position. The 17-55mm manual recommends turning off IS when on a tripod, but only to preserve battery life. This is different from the older IS implementations (it was clear from my shots with an EF 300mm f/4L IS (a 1997 lens that lacks a tripod-sensing IS system) that when mounted on a tripod with IS on, images were blurred due to feedback of trying to stabilize an already-immobile lens).
Also, note that even in lenses where the IS is not tripod-sensing, a monopod is NOT a tripod. A monopod adds stability, sure. But you're still holding the monopod, and as a living, breathing person you will always have some degree of motion, and some of that motion will be transferred to the monopod, and thus to the lens - IS will help reduce that motion. So, when shooting with a monopod you should leave IS on.
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