Lens hoods are primarily intended to prevent unwanted stray light from entering the lens and causing flare. They also provide a degree of protection for the lens from accidental impact and from the elements.
The "petal" shape of this snap-on lens hood maximizes the amount of hood coverage for the minimum amount of weight and hood area
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The HB-64 is a bayonet lens hood designed for use with specific NIKKOR lenses. It is a flower shaped lens hood that snaps onto the lens to help prevent flare from hitting the lens.
1x Lens Hood