Fotasy Silver Metal Lens hood for Olympus M.ZUIKO DIGITAL 17mm f2.8 lens Silver Tilted Metal Lens Hood for OLYMPUS M.Zuiko Digital 17mm f2.8 Lens Made of metal, leica style lens hood It can prevent unwanted stray light from entering the lens and ensure no problems with vignetting or motor functions. Added benefit of extra protection from accidental impact.