Upload & Sell: Off
I use the 300 f4 af-s with the tc17e and it focuses fine in good light with good subject contrast. When I first got mine it was back focusing considerably, so I had to adjust that. Strange, since the 300 alone, and all my other lenses for that matter, require no adjustments. If you dot all your iís and cross all your tís its really quite sharp at f8.