Excerpt: The Tamron 70-300mm f/4-5.6 Di VC USD Lens features a popular and useful focal length range, a nice design, USD (Ultrasonic Silent Drive) AF and VC (Vibration Compensation) for a very affordable price .
Conclusion: The Tamron 70-300mm f/4-5.6 Di VC is surprisingly good optically. It is merely a little bit less sharp compared to my Nikon 300mm f/2.8 AF-S, stopped down to f/5.6. The Tamron does have more chromatic aberration, i.e. color fringing in light-to-dark transitions. Construction wise it is very typical consumer grade with mostly plastic components, but the lens mount is metal; I consider that adequate.
Excerpt: Tailor-made for wildlife and sports shooters, this third-generation 70–300mm full-frame telezoom in Tamron’s SP line adds Vibration Compensation (VC) plus two innovations: an Ultrasonic Silent Drive (USD) focusing motor for near-silent AF, and an element of what Tamron calls XLD glass, a relatively inexpensive low-dispersion glass that the company claims suppresses chromatic aberration as well as fluorite does.
Tamron’s SP AF70-300mm F/4-5.6 Di VC USD; Ultrasonic Silent Drive—Quiet, Fast Autofocusing
1 March 2001
Excerpt: 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.
Excerpt: Originally posted 2011-02-01 on Optyczne.pl What type of lens is currently the most common on the market? If you start to think about it the answer might surprise you. The biggest number of models you can find in the class of amateur telephoto lenses with focal lengths starting from 50-100 mm and ending at 300 mm.
Cons: significant chromatic aberration in the whole focal lengths range,, image resolution at 300 mm could have been at least a bit better.
Excerpt: 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 of camera shake.