The non-technical explanation why is,these VR lenses look for vibration. If they don't find any,they'll go looking for it. and that looking for vibration when there is absolutely none can cause some small vibration.
So just follow this simple rule: when you're hand-holding, turn VR or IS on.When you're shooting on a tripod, for the sharpest images possible, turn VR or IS off.
So just follow this simple rule: when you're hand-holding, turn VR or IS on.When you're shooting on a tripod, for the sharpest images possible, turn VR or IS off.