Fotasy LHEW83L Bayonet Hood Replaces Canon Hood EW-83L for Canon EF 24-70mm f/4L IS USM Lens with Premier Cleaning Cloth Designed for Canon EF 24-70mm f/4L IS USM lens Replaces CANON Lens Hood EW-83L Prevent unwanted stray light from entering the lens. Ensures no problems with vignette or motor functions. Added benefit of extra protection from accidental impact.