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 EF 17-40mm f4L USM lens mount.jpg - Wikipedia
The Canon EF 17-40mm F/4.0L USM Lens Review - YouTube
Canon 17-40mm F4L Lens Review
The Creepy House – Sony A7r w/ Canon 17-40mm f/4 L Lens – Killer Combo! – SonyAlphaLab
17-40MM 17-40/4 CANON EF L USM (SOME DUST, DEBRIS) + SHADE/218293
The Creepy House – Sony A7r w/ Canon 17-40mm f/4 L Lens – Killer Combo! – SonyAlphaLab
Canon EF 17-40mm f/4L USM Lens for Full Frame DSLR Camera