The revolutionary Sigma 18-35 mm F / 1.8 DC HSM ART is the first wide-angle to standard zoom lens with a minimum aperture value of F / 1.8. The Sigma 18-35 mm F / 1.8, specially designed for APS-C format sensors, translates to 27 mm-52.5 mm on a 35 mm camera. To prevent aberrations and curvature, this lens is equipped with an aspherical lens with Special Low Dispersion (SLD) glass. The internal focus and zoom ensure ease of use and functionality. The 9 aperture blades create a beautiful blurred background.