The Sigma 17-70mm f/2.8-4 DC Macro OS HSM Contemporary lens is a versatile all-purpose zoom designed for Canon EF-S mount APS-C DSLRs. Featuring a bright f/2.8-4 maximum aperture and a focal range equivalent to 27.2-112mm on Canon cameras, this compact Contemporary-series lens excels as both a travel and everyday workhorse. The integrated HSM (Hyper Sonic Motor) ensures fast, quiet autofocus with full-time manual override, whilst the OS (Optical Stabiliser) system minimises camera shake for sharper handheld shots. With 1:2.8 macro magnification, an 8.7-inch minimum focus distance, and a sophisticated optical design featuring FLD and aspherical elements, it delivers excellent image quality across most of its zoom range. The thermally stable composite construction keeps size and weight down whilst maintaining precision and durability.