Canon ET-74 Lens Hood for 70-200mm F4.0 L Lens

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Features: Helps prevent glare and sun flare, for evenly saturated exposures 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. Dedicated lens hoods are designed to match the specific focal length of the lens it was designed.