Anti-Reflection Ring for Canon 17-40mm f/4 USM Lens
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 Lens with Pro Filter (Renewed) : Electronics