Fotodiox Dedicated (Bayonet) Lens Hood, for Canon EOS EF 100mm f/2.8 USM Macro Lens as Canon ET-67 Designed to Prevent Unwanted Stray Light from Entering the Lens Reducing Lens Flares Added Benefit of Extra Protection to the Lens from Accidental Impact Dedicated Bayonet Mount Lens Hood Designed to Match the Specific Focal Length of the Lens it is Designed For Made of Premium Grade High Impact Plastic 24 Month Manufacture Warranty