Canon EF 100-400mm f/4.5-5.6L IS II USM Lens w/ B+W 77mm XS-Pro HTC Kaesemann Circular Polarizer Canon EF 100-400mm f/4.5-5.6L IS II USM Lens B+W 77mm XS-Pro HTC Kaesemann Circular Polarizer with Multi-Resistant Nano Coating Purchase this product between May 1, 2016 and July 30, 2016 and get 13 months of free damage protection from Canon. The product must be registered within 30 days of the purchase date to be eligible. Visit http://usa.canon.com/protection to learn more.