It’s the world’s first full-size, high-speed standard zoom with built-in image stabilization, says Tamron. It’s equipped with VC (Vibration Compensation), image stabilization and Ultrasonic Silent Drive (USD).
The high-resolution lens will be produced in Canon, Nikon and Sony mounts. The Sony mount does not include VC, because the body of Sony digital SLR cameras includes image stabilization. The lens for Sony cameras is SP 24-70mm F/2.8 Di USD – without the VC designation.
The lens uses specialized high-grade glass in the three LD elements, three glass molded aspherical lenses, one hybrid aspherical lens and two XR (Extra Refractive Index) glasses.
USD creates a very fast AF drive together with a continuous manual mechanism.
Lens construction is 17 elements in 12 groups.
Minimum focus distance is 0.38m (15.0 in.)
Length is 108.5 mm (4.3 in), weight is 825g (29.1 oz).
Tamron’s original VC image stabilization mechanism used a moving magnet system with a heavy magnet positioned near the moving VC lens element. In the new VC unit the positions of the magnet and the coil are reversed and the VC optical lens element is attached to the coil. The new VC mechanism uses a moving coil mechanism with a lightweight coil. The lighter coil reduces the load on the drive system.