Wondering, on the 200-500mm 5.6 lens, what Sport mode does? I'm shooting birds lately, so assume it would be useful. I assume it has something to do with VR, but wondering what exactly it does. Thanks.
TwistedThrottle has the right answer. For birding, Sport mode works well if you are tracking birds in flight. I used it last weekend photographing eagles hunting at my local hydroelectric dam (Nikkor 70-200mm f/2.8G).
I also used the "Mode 2" on my Sigma 150-600mm C lens, which is the sport mode of that lens. I used a monopod on that lens but I was tracking a lot.