Designed to fit the RF 70-200mm F2.8L IS USM lens, this ET-83F (WIII) lens hood is engineered to cut out flare and ghosting caused by stray light entering the lens, while protecting the front part of the lens from accidental damage. It has a moulded satin texture on the inner circumference and is heat-block coated to prevent heat haze being formed in front of the lens, reflecting infrared light and preventing heat retention when shooting on hot days. This robust lens is equipped with a 2-catch bayonet to ensure firm mounting, and a handy filter adjustment window.