PROS
Sharp, Easy to handhold, Well constructed, Terrific usability thanks to wide zoom ring
CONS
Expensive, f/5.6 maximum aperture may deter some
VERDICT
The 100-400 f/4.5-5.6L IS II USM lens from Canon is everything we were hoping for from the followup to Canon's now old 100-400 lens. For wildlife and action photographers in particular, this is the lens you've been waiting for.