Originally posted by leekil 'f you're using a long focal-length lens, and the image is jiggling around significantly in the viewfinder (and even going in and out of view), it could definitely affect focusing and exposure. This would be a more extreme case, however, but it also might be the type of situation where the OIS stabilization is most useful.
I'd agree with that as I've had some AF lock issues with DA300 and DFA150450 aimed at stationary subject. So, I've done an experiement: perform 100 AF operation from the same defocus position, toward a stationary target, hand held and on a tripod, I could confirm that the AF lock success on tripod was something like 99% locked and in focus, while handheld it was barrely around 80% AF lock rate and in focus shots. So, I could not say that OIS improves exposure metering that much as the average illumination has more to do to environment, but for AF, OIS is definitely easing the job of the AF servo. no a big deal for wide to short tele lenses, but much more relevant with long lenses.