The EW-82 Lens Hood from Canon helps you take clear photos in bright outdoor locations by minimizing flare and ghosting resulting from any stray or unwanted light that enters the lens. It is specially designed for use with the Canon EF 16 to 35 mm f/4L IS USM lens. In addition to this, the lens hood also offers protection to the front lens element from impacts, abrasions, or accidental collisions. You can use this lens hood as a spare accessory or as a replacement for the original lens hood that comes with the lens.