Amazon.com : Canon EF 17-40mm f/4L USM Lens with Pro Filter
Amazon.com : Canon EF 17-40mm f/4L USM Lens with Pro Filter,Canon EF 17-40mm f/4L USM - Lenses - Camera & Photo lenses,Canon 17–40mm f4L USM Lens Review | by Adam Karnacz | .RAW,Amazon.com : Canon Advanced Two Lens Kit with 50mm f/1.4 and,Used Canon EF 17-40mm f/4 L USM | MPB