Voigtlander LH-40N Screw-In Lens Hood for 28mm f/2.8 Color Skopar SL II and 40mm f/2.0 Ultron SL II Lenses Compatibility: Voigtlander 28mm f/2.8 Color Skopar SL II and 40mm f/2.0 Ultron SL II Lenses Filter Thread: 52mm Rear Thread: 52mm