The Canon EF 17-40mm f/4L USM Lens is a wide-angle zoom lens designed for use with Canon EOS cameras. It has a focal length range of 17-40mm, making it ideal for landscape, architecture, and interior photography. The lens is part of Canon's L-series, which means it is constructed with high-quality materials and features advanced optical technology. The lens has a maximum aperture of f/4 throughout its zoom range, which provides consistent exposure and depth-of-field control. It uses an ultrasonic motor (USM) for fast and accurate autofocus, and has a manual focus override for more precise control. The lens is constructed with three aspherical elements and one super UD (ultra-low dispersion) element, which helps to minimize distortion and chromatic aberrations. The Canon EF 17-40mm f/4L USM Lens is a versatile and high-quality option for photographers who require a wide-angle lens.

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

EF 17-40MM F4L USM