Get a different perspective with this ultra-wide zoom from Canon’s L series. Made using a superior optical construction that uses three aspherical elements and one Super UD (Ultra-low Dispersion) glass element, the Canon EF 17-40mm f/4L USM is a lens that meets and exceeds the demands of professional users. It provides a minimum focusing distance of 0.28m and is equipped with a powerful ring-type USM for fast, silent autofocus.

The maximum aperture of f/4 runs right the way through the zoom range, and the lens is built with a weather-resistant construction for outdoor use, just like other high-end L-series lenses. Whether you’re planning on shooting architecture, landscapes, cityscapes, night skies or whatever else, you’ll find the Canon EF 17-40mm f/4L USM an amazingly useful tool.