This came for free when I ordered a 100mm f/2.8 macro Canon lens. It took it because when you sell a lens people like to see that it has a filter and its good to throw in as a "bonus." That being said, I wouldn't have paid anything for this UV filter. Don't put a $10 piece of glass in front of a $500 - $1,000 lens. If you really feel like you need one, try thisHoya 67mm HD Hardened Glass 8-layer Multi-Coated Digital UV (Ultra Violet) Filter.