Tamron SP 17-50mm F/2.8 XR Di-II VC LD Aspherical for Canon APS-C Digital SLR Cameras (6 Year Tamron Limited USA Warranty) Compact Fast Zoom with VC (Vibration Compensation). Fast Constant F/2.8 Aperture. For use on APS-C size DSLR cameras. 11.4-Inch minimum focusing distance / 1: 4.8 Maximum magnification ratio. Internal Focusing.