The Tamron SP 24-70mm F/2.8 Di VC USD includes both Tamron’s proprietary VC (Vibration Compensation) image stabilization to reduce shake and its USD (Ultrasonic Silent Drive) motor, enabling speedy, silent autofocusing. This SP (Super Performance) series lens makes full use of specialized glass elements in its lens layout, designed with top priority on image quality, including three LD elements and two XR (Extra Refractive Index) elements.
Overall, we’re extremely impressed with the Tamron 24-70mm F/2.8 VC. It demonstrates that it’s entirely possible to add an effective image stabilization system to a lens of this type without a significant drop in quality elsewhere. The optics are excellent, the autofocus fast, silent and accurate, and the build quality very good indeed. The Tamron comes so close to the much more expensive non-stabilized Canon and Nikon lenses, both optically and operationally, that it’s difficult to see why most enthusiast photographers might choose to buy them instead.