Fotasy 43mm Silver/Chrome Curved Vented Metal Lens hood for Leica, Contax Zeiss, Voigtlander Lens 43mm Chrome / Silver Metal Vented Lens Hood for Leica, Contax Zeiss, Voigtlander rangerfinder Lens Fits Zeiss Biogon T* 35mm f/2 ZM, Zeiss Planar T* 50mm f/2 ZM, other lens which is with 43mm filter thread 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.