CHG_CANON wrote:
You'll probably find the 100-400L II is:
a) Sharper
b) More versatile
c) Can be extended by the 1.4x III for more reach
d) Is more expensive
e) Is heavier and larger, maybe negating the idea of a walkaround lens
f) Requires practice for sharp images of moving subjects with the appropriate camera configuration, just like all camera equipment
Judy 2011, who no longer posts on UHH, uses the 100-400L II. She handholds it and gets fantastic photos. It doesn't seem to be too heavy for her. She doesn't shoot bif, but in situ, yet often at a distance with great effect. Using a crop sensor camera, it provides fov up to 600mm.