The Sigma F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake compensation function; with a 13.8 times zoom ratio. As opposed to having an anti-shake function in the camera body, this lens' hybrid optical stabilizer provides not only an anti-shake function for the camera body, but also compensates for image shaking in the view finder as the optical stabilizer is built in to the lens. Incorporating four special low dispersion glass elements and three aspherical lens elements provides excellent image quality throughout the entire zoom range.