I use a 400mm DO with and without a 1.4x as my prime BIF lens and usually hand-held but sometimes on a monopod. Typically, I shoot at 1/1250 and 1/1600. Although I usually have IS off, I noticed yesterday after returning from a BIF trip that I must have inadvertently set IS on, and when looking at my images on-screen, noticed that some images were degraded somewhat, specifically in areas which are normally sharp. Is it possible that having IS on actually added some movement artifacts?







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