For the first time, Tamron has incorporated an Ultrasonic Silent Drive, or USD, with full-time manual override in this zoom lens, making it a competitive technology with Nikon's Silent Wave Motor, Canon's Ultrasonic Motor (USM), and Sony's Super Sonic wave Motor.

A surprising good lens, did read many reviews in order to choose between nikon 70-300 and this one , in the end the Tamron was best in most of the reviews. So bought one. (nikon was $ 713 that's $ 300 more !

Sharp; light; accurate autofocus ; inexpensive

noise; distortion

The lens handles very well, the only thing that lets it down is the CA, esp at telephoto, need to stop down to f8 to reduce it. Despite the CA still prefer it over the Canon version just due to build quality and handling, have owned both.

Quiet fast AF FTM Excellent stabiliser Sharp up to 300

Chromatic Abberation especially wide open Struggles to focus accurately in low light

This lense is very good it produces sharp pictures even using it close up. the build quality is great and value for money. Dwi are great the customer service is awesome I have bought a few items from them with no problems. Thanks John

The Tamron 70-300mm f/4-5.6 SP DI VC USD features both Low Dispersion (LD) and Extra Low Dispersion (XLD) lens elements to help correct chromatic aberration and is also fitted with an Ultrasonic Silent Drive (USD) motor, as well as Tamron's Vibration Compensation (VC) mechanism to reduce the effects...

The Tamron SP designation is reserved for lenses developed with special emphasis on extraordinary photographic performance. Engineers are free to innovate in an uncommon atmosphere where optical performance comes before price, resulting in lenses that satisfy the demands of discerning photographers.