The EF 17-40mm f/4L USM Lens is an ultra-wide-angle lens producing stunning clarity in a range of focal lengths. Its compact, lightweight body makes it an ideal travel companion - suited to interiors, architecture and landscapes, fitting more in the frame without the need to step back. Produce consistent exposures with the large f/4 aperture over the 17-40 mm zoom range and create softer background blur with a 7-blade circular aperture diaphragm. Part of the Canon professional L-series flagship range, its designed for robust handling and resistant to dust and moisture. Benefits Capture striking architecture and expansive landscapes with this ultra-wide-angle L-series lens Shoot hand-held and in low light conditions with a fixed aperture of f/4 Get closer to your subjects with 0.28 m focusing distance through the entire zoom range Ensure accurate colour balance and enhance contrast along with reduced ghosting and flare with Super Spectra coating Produce sharp, high-contrast images with Super UD (ultra-low dispersion) elements to suppress chromatic aberrations Be prepared for split-second moments with a fast, responsive Auto Focus with Ultra-Sonic Motor (USM) Use specialised filters, such as polarisers and graduates with ease thanks to the non-rotating lens Compatible with all DSLR cameras including full frame and EOS M mirrorless with an EF-EOS M Mount adapter What\'s in the box EF 17-40mm f/4L USM Lens Hood EW-83E Lens Cap E-77U Lens Dust Cap E Lens Case LP1319 User Manual Good for Architecture * Interiors * Travel * Landscape * Street * Life * See all specifications