I am going to try out the D7000 to shoot some whales and landscapes. I have an AF-S Nikkor 70-300mm 1:4.5-5.6 G lens as well as an 18-55mm kit lens that came with my 3000. Will my 70-300mm auto focus? I did try to at least find the answer. I know its DX and I know the 7000 is compatible with...