During my 30-year pro career I rely heavily on Canon's ultra-wide angle lenses from all three generations of the 16-35mm 2.8 and the fixed 14mm. This lens is far superior to all it's predecessors. Not only is it wider but seems sharper with less distortion.

Sharp pictures, a whole new perspective with no distortion wide angle.

no distortion high quality construction

heavy

To experience the ultimate in wide-angle photography, the EF 11-24mm f/4L USM brings L-series construction and optics to the widest zoom lens Canon has ever made. With an expansive wide-angle range of 11-24mm, this is an ideal lens for landscapes, interior shots, and unique perspectives on subjects...

Excellent quality lens - gives true "WYSIWYG"

I'm a Architectural photographer and this is perfect! The only issue i've had was shooting very larger rooms wide open, sometimes I have to zoom in on post processing. I love it!

Pro: Excellent outdoor and landscape pictures Con: 1. I can still see certain amount of distortion. Canon never said it is Zero distortion. Sigma version advertised as "no distortion" 2. Price is high. the lowest price (US warranty) I have seen is $2499. International version is $2200 3.

We don't often cover lenses on their lonesome, but the Canon EF 11-24mm f/4L USM is a bit special. It's the widest-angle rectilinear zoom lens for full-frame DSLRs in the world, making it a perfect companion for the just-announced or 5DS R.

There was a time when I'd avoid a zoom lens as much as I'd avoid a swarm of midges. But in the digital age, the zoom lens has taken on new purpose, at least for me. Midges, however, are still a pest that is best avoided-especially when you're changing lenses.

Canon's EF 11-24mm f4L USM is an outstanding lens for lovers of wide-angle photography. It takes you from a respectably-wide 24mm to extreme coverage at 11mm, swallowing over 120 degrees across the diagonal.

For many years Canon photographers had a reason to be jealous of those on the Nikon side of the fence. There was no match to Nikon's excellent AF-S Nikkor 14-24mm f/2.8G ED zoom for full-frame SLRs.

Ultra-wide field of view; Maintains f/4 when zoomed; Very sharp

Shows some barrel distortion; Corner and edge dimness; Omits filter support; Big and heavy; Expensive