Canon ET-67 Lens Hood;

Hoods are one of the most important accessories for each lens you own%2E A lens hood provides multiple functions%3A it shades the lens from stray light%2C improving your contrast and image quality%3B in inclement weather%2C it can assist in keeping moisture or wind%2Dblown debris off the lens%3B and it protects the front barrel from the inevitable impacts against walls%2C door frames%2C and other real%2Dlife obstacles%2EThis hood is compatible with EF 100mm f%2F2%2E8 Macro USM%2E