Canon 17-40mm f/4 USM 'L' lens review with samples (full frame and APS-C)
Canon EF 17-40mm F/4L USM - Canon lens (Focal length 17-40mm, aperture f 4-22, 2.4X optical zoom, diameter: 77mm) Black. Canon L Series Professional L Stock Photo - Alamy
Amazon.com : Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras : Camera Lenses : Electronics
The Creepy House – Sony A7r w/ Canon 17-40mm f/4 L Lens – Killer Combo! – SonyAlphaLab
Canon 17-40mm f/4 L USM EF Mount Lens {77} - With Case, Caps and Hood - EX+