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I always take pictures with optical image stabilization enabled (except if I take long exposure shots with a tripod), but I was wondering if OIS could (in some cases) reduce the picture quality.
OIS works by moving one glass element inside the lens, so if I shake the camera while taking a picture the lens has one decentered glass element, which should cause some softness in the final picture I think, but that's something I never encountered.
Can an optical stabilization cause a reduction of the picture quality ? Is it something only visible on certain type of lenses or not at all?