Lens hood are designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. As the end of the lens is extended, lends hoods also offer some extra protection to the lens.
The Phottix EW-83J lens hood is a substitute lens hood for the Canon EF-S 17-55mm F/2.8 IS USM. Shields against flare and protects front element against accidental damage.
