The Vivitar 52mm Digital Lens Hood is 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.
Reviewed by 2 customers
I purchased the Vivitar lens hood for my 52mm 35-105mm Nikon lens. It doesn't work like the current Nikon lens hoods and so you get vignetting. I would not recommend it.
I bought this hood for an old, but versatile, Nikon 35-105 zoom lens. The hood screws on, but as the lens focuses the hood turns with it so it almost guarantees vignetting. That's why I returned it.