Canon EW-78D Lens Hood for the Canon EF-S 18-200mm lens
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The Canon EW-78D Lens Hood is created especially for the Canon EF-S 18-200mm f/3.5-5.6 IS USM lenses.
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading. Since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. Primarily a lens hood is designed to prevent unwanted lens flare and can also improve contrast and image quality.