I am not sure why I do this (I have great macro lenses) but I put the 35mm Kenko extension tube on my 70 - 300 VR. It works quite well I focus with the zoom. I tested the VR at 1/20 sec with AF off and the VR was perfect. Using no the VR shot was unsharp. The SB800 was used remotely. Minimum focus is about 6 inches.