9 out of 10 points and recommendedLight weight for it's specification and very good resolution.lowish contrast
Great lightweight lens (for a 400mm f4).reviewed October 3rd, 2008
The resolution is very good however the contrast is lower than other L series super telephotos. This is due to the DO construction. Images taken with this lens will need a little extra local contrast addedd in raw processing.
I use this lens as a walkabout hand held wildlife lens.
Autofocus is very quick with my 1DS Mrk3.
9 out of 10 points and recommendedfast, good resolution, good constrution, nice contrast and colour.slightly soft in the outer zone with a 1DS3
This lens is Canon's best and newest wide angle zoom and out performs my 17-40mm f4 by a small margin.reviewed October 3rd, 2008 (purchased for $1,400)
It is well built and has nice contrast. As with most lenses it performs better when stopped down and vignettes slightly at f2.8.
On my full frame 1DS Mrk3 the lens is very sharp in the center and slightly soft in the outer zone, even when stopped down. This is noticeable on an A2 print. Unfortunately the lens isn't in the same class as the Nikon 14-24mm f2.8.