The SP 24-70mm F/2.8 Di VC USD lens includes Tamron's vibration compensation technology, which can counteract camera shake to stabilize photos. It's a feature that Canon and Nikon haven't added to their 24-70mm F2.8 lenses.
The lens will be developed for Canon, Nikon and Sony mounts. VC (Vibration Compensation)
VC (Vibration Compensation) is Tamron’s proprietary image stabilization system. Tamron’s VC is a three-coil system, whereby three driving coils activate the shake-compensating VC lens group electromagnetically via three steel balls. New VC system (moving coil method)
Tamron’s original VC image stabilization mechanism utilized a moving magnet system whereby a heavy magnet was positioned near the moving VC lens element. Because the 24-70 mm F/2.8 Di VC USD is a high-speed zoom lens with maximum aperture of F/2.8, its VC system must drive a lens that is larger and heavier than other zooms. Tamron has announced a 24-70mm F2.8 zoom for full frame cameras that features inbuilt optical stabilisation - a first in this class of lens.