Sigma 24-70mm f/2.8 IF EX DG HSM AF Standard Zoom Lens for Canon Digital SLR Cameras - International Version (No Warranty) Large aperture standard zoom lens 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