Originally Posted by
Zee71
William..........the 70-200mm with the 2x combo definitely knocks down the focusing speed, but it is faster when it comes to focusing then the 80-400mm. IQ is pretty close, but with the 2x teleconverter on the 70-200mm for optimal sharpness you need to shoot at f/11 or there about. So.....at a 400mm and f/8 on the 80-400mm versus 400mm and f/8 on the 70-200mm with the 2x teleconverter I feel that IQ will be slight better on the 80-400mm (but that's just my opinion). The 70-200mm lens is my work horse for spotting in and around JFK. Most of the time I have the 1.4x teleconverter attached to it.
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