I have read that above certain shutter speeds the image stabilization doesn't work that good anymore. Something to do with the frequency with which IS works? With high shutter speeds, the possibility exists that IS actually creates blurriness/movement in the photos? In any case, IIRC above 1/500 or so, it would be better to switch IS off?
What are your experiences?
Yessir! I'm aware of that! Although the latest Nikkor lenses seem to sense when the camera is mounted on a tripod. But to be sure, I always switch it off when tripoding!
Just read the manual from my 120-400 (sigma) but nothing on high shutter speed.
Only something on option 1(horizontal) and 2(vertical), they advise option 2 for moving objects.