Conclusion: Tamron has produced a telezoom \Lthat delivers in every key area. From focusing through to optical performance, it doesn’t disappoint and should meet the requirements of most enthusiasts. Its large size may put off some, but we’d recommend it to anyone looking for a powerful and capable telezoom.
Excerpt: Tamron's "60th Anniversary" lens model, the SP 70-300mm f/4.0-5.6 Di VC USD (aka the A005) is a medium telephoto zoom lens designed to help you produce exceptional images on both full frame and cropped dSLR bodies. While originally being produced for Nikon models, the A005 is now available in an EF mount for use with Canon EOS dSLRs.
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 (SWM), Canon’s Ultrasonic Motor (USM), and Sony’s Super Sonic wave Motor (SSM). This mechanism is designed to speed up autofocusing, with the added advantage of quiet operation.
Excerpt: Unlike the somewhat basic affair that is the Tamron AF 70-300mm Macro , the new Tamron SP 70-300mm f/4-5.6 Di VC USD has all the latest bells and whistles, or at least their high-tech, optical equivalents.