Canon EF 100mm f/2.8 Macro USM Lens Package Includes 11 Products - All with USA Warranty and Manufacture Supplied Accessories 100mm macro USM lens with f/2.8 maximum aperture for Canon SLR cameras Secondary diaphragm blocks stray light at f/2.8 for increased contrast Ultra-sonic monitor provides outstanding autofocusing speed at all distances 3-group floating system for exceptional close-up performance; full-time manual focus