From the Manufacturer:
Higher function for great photos:
The apex of telephoto lenses in a compact package. “SP 70-200mm F/2.8 Di VC USD” with VC (Vibration Compensation) image stabilization delivers leading-edge image quality in a body that’s smallest in its class. Equipped with Tamron’s proprietary USD (Ultrasonic Silent Drive) motor, this lens boasts a speedy autofocus so that you can capture that one decisive moment. For sports, journalism, fashion, weddings, or even landscapes, the 70-200mm will exceed your expectations every time.
Technology and innovation all packed into one small place:
The most compact lens body in its class, and it’s equipped with Tamron’s USD (Ultrasonic Silent Drive) motor and VC (Vibration Compensation) image stabilization to reduce camera shake so you can achieve the previously unobtainable.
Delivering leading-edge image quality: With one special XLD (Extra Low Dispersion) glass and four LD (Low Dispersion) elements, this lens offers a new level of correction for chromatic aberrations. The new advanced optical design delivers higher performance with excellent contrast and resolution.
USD (Ultrasonic Silent Drive): The quiet high-torque USD motor ensures a speedy and accurate autofocus response.
Add 4 stops for shake-free shooting: VC (Vibration Compensation)
This high-speed F/2.8 telephoto zoom lens is equipped with the VC mechanism that delivers sharp and vivid viewfinder images. Even in low-light situations, VC reduces camera shake to deliver sharp images.
Rounded diaphragm and high-speed deliver spectacular blur effects:
Using a rounded diaphragm, this lens achieves spectacular blur effects. By distinctively blurring backgrounds and foregrounds this high-speed lens creates images that bring your subject into focus, thus to life.
Full-time manual focus: Fine focus adjustments using manual focus can be made during autofocus shooting, without the need to change focus mode.
Moisture-resistant construction helps protect from the elements: Moisture-resistant construction helps prevent moisture from penetrating the lens.