Designed to prevent stray light from entering the lens in order to keep unwanted glare from affecting your photographs. Compatible with Canon Lens EF 28-80mm f/3.5-5.6 II, EF 28-90mm f/3.5-5.6 II USM, EF 28-90mm f/3.5-5.6 III, EF-S 18-55mm f/3.5-5.6 II USM