Sigma 18-35mm F1.8 DC HSM ART Lens with UV, CPL, FLD, ND4, +10 Macro Filters and Bundle for Canon EOS 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5Ds, Rebel T6s, T6i, T5i, T5, T4i, T3i, T3, T2i and SL1 Digital SLR Cameras Large aperture high-speed lens ideal in low light Offering the bright F1.8 aperture and an angle of view extremely close to that of human vision Placed under the Art category, unique. fast constant aperture zoom lens 27-52.5mm equivalent focal length on APS-C cameras HSM (Hyper-Sonic Motor) ensures a quiet and high-speed auto focus