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
File:Canon EOS 5D with Canon EF 17-40mm F4L USM lens.jpg - Wikimedia Commons
Canon EF 17-40mm f/4L USM Ultra-Wide Zoom Lens - Newegg.com