Add review for Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens
Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens
Canon EF 17-40mm f/4L USM Lens is an ultra wide angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This L-Series Lens from Canon focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for...

