Canon EF 17-40mm f/4.0L USM Reviews

Nice range for a cropped DSLR. Optically ok, maybe a bit soft at the wide end. Fairly fast and reliable focuser. Build quality good, yet not up to EF24-70. I guess pricing is about ok. Very usefull wide zoom.

Excellent sharpness and build quality. Colors and contrast are outstanding. Resistence to flare is the best I've seen. However, it displays visible barrel distortion at the wide end and some pincushion on the long end. Corners are soft on a FF sensor, and there is some vignetting. These traits can be annoying as its strong sides make me expect perfection all around. (tested on EOS 5d)

Top len's,razor sharp,build is superb.
no softness with my copy,in my view is
just about level with the 24/70.F4 is
fine my handheld shot's ar pin sharp.