Sun 17-Feb-13 04:47 PM | edited Sun 17-Feb-13 04:49 PM by mklass
>It will focus much faster on a D4 than on a D3200. > It will indeed focus more slowly on a D3200, as the D3200 does not have a focus motor to drive the lens AF. So it won't AF at all.
The 80-400 has some benefits (provided you have a camera can drive the AF). It is relatively compact and light compared to the other options, like the Sigmas. It also has a max aperture of f/5.6, as opposed to f/6.3. That 1/3 stop actually can make a difference in marginal light.
I found it to be a good lens for daytime outdoor sports and bird shooting. On a DX body (D90, D300s or D7000 currently ) it will give you a lot of reach.