The Tamron 70-300mm f 4-5.6 SP Di VC USD Lens offers unparalleled optical performance in a fast & steady telephoto zoom. Its advanced design features an LD (Low Dispersion) & an XLD (Extra Low Dispersion) lens element to help prevent chromatic aberration & provide sharp contrast. This is the first Tamron lens to be equipped with a USD (Ultrasonic Silent Drive), Tamron's very own ultrasonic auto-focus drive mechanism for faster focusing, making it a perfect telephoto zoom choice for photographing sports, wildlife, or other fast-moving subjects. In addition, Tamron's VC (Vibration Compensation) image stabilization assists h&-held photography, not only at long focal length ranges where blurring is common, but also under low-lit conditions. This combination of technology & quality optics makes the Tamron 70-300mm f 4-5.6 SP Di VC USD Lens a premium telephoto zoom lens for both professional & enthusiast photographers.