B001NEK2RI Sigma 24-70mm f/2.8 IF EX DG HSM AF Standard Zoom Lens for Sony Digital SLR Cameras

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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