Sigma 24-70mm f/2.8 IF EX DG HSM AF Standard Zoom Lens for Canon Digital SLR Cameras Large aperture standard zoom lens This lens has a minimum focusing distance of 38cm/15in and a maximum magnification ratio of 1:5.3, Focal Length : 24-70mm ELD and SLD glass provides excellent correction of all types of aberrations Super Multi Layer Coating reduces flare and ghosting, Equipped with HSM ensuring quiet and high speed AF The rounded 9 blade diaphragm creates an attractive blur