I was trying to decide whether to keep my TC17Eii or not so I set up some tests with the D800/Nikkor 300mm f/4 and the TC17Eii.
The shots below taken at 750mm total (exif data = D800 w/300 f/4, ISO 1600 and the TC17Eii in DX mode). The sunflower was taken at about 20 feet, the bee at about 6 feet, the finch at 40 ft and the neighbors chimney was at a distance of about 150 yards. I am satisfied with these results considering the focal length and overall quality when using the TC17.
The long focal length, with the 300 f/4 on a tripod and the Manfrotto lens support, seems to meet "my" expectations when shooting this combo and I am thinking of now keeping the TC17.
Any opinions or comments? (I am not looking for praise of the photos just whether you think they are also good enough considering they are at 750mm and cropped about 70% each.