I don't know why my tech notes say 950mm when a 400mm lens with a 1,7X converter is 680mm and if you use the digital multiplier of 1.5 for my Nikon it would give you an effective focal length of 1020mm. Wierd isn't it?
Nikon D200
,400mm f2.8 AFS Nikkor w/1.7X 1/125s f/4.8 at 950.0mm iso200 with Flash
full exif