The Sigma 70-200 2.8 EX DG HSM OS is a large aperture telephoto zoom
lens which features Sigma technology including a Hyper Sonic Motor (HSM)
and an Optical Stabilizer (OS). Fast, sharp and highly versatile, the
70-200mm 2.8 is a staple focal length for many types of photography
including wedding photography, portrait photography, sports photography,
and wildlife photography to name a few. Two FLD glass elements (with
performance equal to Flourite) and 3 SLD elements (Special Low
Dispersion) ensure outstanding image quality through the entire 70mm to
200mm range. An OS system compensates for camera shake when shooting
handheld and a rounded 9 blade diaphragm creates beautiful bokeh.
Designed for full frame cameras, the 70-200mm 2.8 will work on APS-C
sensors, translating to roughly 112-320mm.