If you are looking for an extremely sharp ultra-wide angle zoom lens, the Canon EF 16-35mm f/4L IS USM Lens should be at the top of your consideration list. This lens delivers prime-grade image sharpness right into full frame corners and it has the overall performance to match, including AF speed...

The Canon EF 16-35mm f/4L IS USM is a very capable but also very pricey ultra-wide-angle zoom lens that will appeal most to landscape, architecture and reportage photographers looking for a lightweight and responsive lens with the added advantage of image stabilisation for low-light hand-held work.

Canon's EF 16-35mm f4L IS USM is an ultra-wide zoom that's compatible with full-frame DSLRs. It's the successor to the EF 17-40mm f4L USM, losing a little on the long-end, but gaining a tad on the important wide-end, while also adding the benefit of image stabilization.