I have a new 70-200 Nikon VR F/2.8 lens and wanted to see how it works with my D700. I added a 1.4 Nikon teleconverter also and tried to get some bird pictures. The auto focus feature works with this setup which is very nice, but the image size is fairly small. Probably the D300 with its 1.5 crop factor would be better. I probably will use the D300 a lot for wildlife pictures.