Description of Canon Lens Hood EW-83E:
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. The "petal" shape of Canon EW83E Lens Hood maximizes the amount of hood coverage for the minimum amount of weight and hood area. Canon EW-83E Lens Hood is designed to match the specific focal length of the lens it was designed for.
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