wolfman wrote:
Better lenses usually cost more. Better build quality, completely weather sealed, sharper, and an extra 100 mm of reach. And further more, the focusing at 6.3 is just as fast as at 5.6.
It also plays very well with the Sigma 1.4 TC.
In theory, focusing at f6.3 will NEVER be as good as f5.6 all things being equal ......especially in lower light.