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 for.
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Comments about Nikon HB-15 Bayonet Lens Hood:
This fits a bit more snug than the original which was a plus for me. It's a hood. It works as designed and makes your lens look bigger, if you're into that sort of thing.
Pros
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Comments about Nikon HB-15 Bayonet Lens Hood:
It works
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