This lens hood is designed specifically to fit the Canon EF 600mm f/4L IS III USM L-series lens. When secured, it prevents stray light from entering the lens which can be a source of flare and ghosting, whilst also protecting the lens front element. This Canon (ET-160 WIII) lens hood is built to the same exacting standards as the EF 600mm f/4L IS III USM lens, designed to blend in perfectly with the lens thermally-insulating white paint exterior. Benefits Prevents flare and ghosting when shooting into the light Protects the lenss front element from accidental damage Designed specifically for the EF 600mm f/4L IS III USM Styled to match the white exterior of Canons super-telephoto lenses Lightweight wont weigh you down Can be reversed and attached to the lens to save space What\'s in the box ET-160 (WIII) Lens Hood Compatibility EF 600mm f/4L IS III USM EF 600mm f/4L IS II USM RF 600mm F4L IS USM RF 1200mm F8L IS USM