Clicking fabulous-quality portraits or sports photographs is piece of cake with the Sigma EX DG OS HSM and its 70mm-200mm focal length. Enjoy vibrant and bright pictures with the f/2.8 maximum aperture of this Sigma 70mm-200mm lens. Let your shaky hands remain a secret by clicking rock-steady images with the optical image stabilization feature of this Sigma f/2.8 lens. The ring-type HSM focusing of the Sigma EX DG OS HSM allows for sharper images. This Sigma 70mm-200mm lens is compatible with Canon, Nikon, Pentax, Sigma and Sony mounts, making it highly versatile. The 9-blade circular aperture of this Sigma f/2.8 lens ensures perfect rendition of areas that are out of focus.