Summary: I use this lens for birds and wildlife on a Nikon D800, sometimes with a 1.4 Nikon teleconverter and also without it. It is a fast focusing lens even on the D800. I mounted it on a friends D3 and it is superfast! I love the lens and am glad that I went ahead and made the investment.
Summary: I have been using plenty of long tele lenses already, primarily zoom lenses, including the Nikon 200-400 VR, so I thought that I knew what excellent contrast rendition and sharpness looks like. Obviously I have been mistaken! The Nikon 500mm VRII is even better than I have expected.
Summary: Very fast focus, extremely sharp, and the VR allows for hand held photography of flying birds. I have owned several long lenses and this is the fastest focusing and sharpest lens I have owned.
Summary: I wanted some long glass that I could wield on a monopod. This fits the bill nicely. I can hike all afternoon with this lens on my monopod with the D7000 attached. It's not light but it's a whole lot lighter than the 600f4.
Summary: Wanted just a bit more telescoping that my 400mm lens and this does the trick. Not nearly as expensive as I expected it to be. Well worth every dime. Now I can see the eagles in the nest just like I am sitting there. Even my husband was impressed! This photo was taken approximately a football field away from their nest.
Summary: Lightweight for its focal length and rock steady in the VR mode. Extreme clarity, excellent light management and fast focus make this a must for any nature/wildlife photographer. Outstanding performance on the D3x and the D3. Tack images with tons of resolution. Just superb.