The dedicated Vello ET-60 Lens Hood is specifically designed for use with Canon's EF 75-300mm f/4.0-5.6 USM II II USM III and III USM EF-S 55-250mm f/4-5.6 IS and EF-S 55-250mm f/4-5.6 IS II lenses.Lens hoods are primarily designed to prevent unwanted stray light from entering the ...The dedicated Vello ET-60 Lens Hood is specifically designed for use with Canon's EF 75-300mm f/4.0-5.6 USM II II USM III and III USM EF-S 55-250mm f/4-5.6 IS and EF-S 55-250mm f/4-5.6 IS II lenses.Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. A dedicated lens hood is designed to perfectly match the specific focal length of the lens it was designed for. Moreover this hood features a non-glare matte finish on the interior surface to further prevent or limit lens flare.
Also since the end of the lens is extended you get the added benefit of some extra protection from accidental impact. The Bayontmount is designed to also work in the reversed position allowing the hood to be placed backwards over the lens for a more compact storage solution. For Canon EF 75-300mm f/4.0-5.6 USM, II, II USM, III & III USM, EF-S 55-250mm f/4-5.6 IS & EF-S 55-250mm f/4-5.6 IS II Lenses