Canon ET-86 Lens Hood for EF 70-200mm f/2.8L IS USM Lens Designed to prevent unwanted stray light from entering the lens Ensures no problems with vignetting or motor functions Added benefit of extra protection from accidental impact Compatible with EF 70 to 200mm f2.8L IS USM lens Reduced 'flare' caused by light shining directly on the lens' front element.