The Sigma EX 17-50mm f2.8 DC OS USM for Canon EF-S mount offers a versatile zoom range from wide angle to short tele combined with a fast f2.8 constant aperture. Built-in image stabilization allows handheld use in a wide range of difficult lighting conditions. This is a lens for APS-C sensor-sized Canons, and won’t work with full frame EF cameras. Clean glass, excellent functionality. Great cosmetic condition with only minor wear from use.