Amazon.com : Fotodiox Lens Hood Replacement for EW-83E Compatible with Canon EF 16-35mm f/2.8L and Other Canon Wide Angle Lens : Camera Lens Hoods : Electronics
Amazon.com : Canon EF 16-35mm f/2.8L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras (Discontinued by Manufacturer) : Camera Lenses : Electronics