40.5mm Wide Angle Metal Lens Hood Shade for Leica, Contax Zeiss, Voigtlander and other Lenses Fit wide angle lenses (28mm 35mm 45mm) which is with 40.5mm filter thread Also fits other brand lenses with 40.5mm filter thread It can prevent unwanted stray light from entering the lens and ensure no problems with vignette or motor functions. Fotasy is a registered trademark.