Sigma 10-20mm f/4-5.6 EX DC HSM AF Lens Kit with USA Warranty, for Canon EOS Digital SLR Cameras. with Tiffen 77mm UV Wide Angle Filter, Professional Lens Cleaning Kit Super wide-angle zoom lens designed exclusively for digital SLR cameras Covers a superwide angle of view 102.4to 63.8 Three pieces of Special Low Dispersion (SLD) elements and three aspherical lens elements produce top quality optical performance. Inner focusing system ensures the length of the lens remains unchanged whilst controlling aberrations. Equipped with HSM (Hyper Sonic Motor) system