The Canon EF-S 10-22mm f/3.5-4.5 USM is an ultra wide-angle zoom lens engineered for Canon APS-C format DSLRs, delivering a 16-35mm equivalent focal length range. This compact and lightweight lens features a sophisticated optical design with 13 elements in 10 groups, including one Super-UD element and three aspherical elements to minimise chromatic and spherical aberrations. The ring-type USM autofocus system ensures fast, silent focusing with full-time manual override capability, whilst an internal focus mechanism maintains consistent lens length during operation. With Super Spectra coatings to control flare and ghosting, exceptional minimum focus distance of just 24cm, and 77mm filter diameter, it's an ideal choice for architectural, landscape, and travel photography on Canon EF-S mount systems.