A Interesting development: Tamron has announced a VC version of the 70-200 f/2.8.
What I find more interesting is that Tamron says that "development" has begun, yet they plan to begin shipping before the end of 2012. Wow -- that sounds very fast.
Read more below.
http://www.tamron-usa.com/news/35mm/70200_A009_2012.asp![]()
Product Features
• One special XLD (Extra Low Dispersion)(5) glass in concert with four LD (Low Dispersion) elements minimize chromatic aberrations. This combined with a new optical design that delivers high contrast and high resolution throughout the zoom range achieves leading-edge image quality.
• Tamron’s advanced multi-layer coating technology dramatically improves lens performance by reducing flare and ghosting for crisper, clearer images.
• The rounded diaphragm(6) affords the photographer spectacular blur effects, delivering the kind of rich expression only achievable with a high-speed telephoto zoom lens.
(1) For high-speed telephoto zoom lenses for full-size SLR cameras, equipped with VC image stabilization and USD. Current as of September 2012. (Source: Tamron)
(2) VC (Vibration Compensation) is Tamron's proprietary image stabilization mechanism.
(3) USD (Ultrasonic Silent Drive) is Tamron's proprietary ultrasonic motor drive.
(4) The Sony mount does not include VC, as Sony digital SLR bodies include image stabilization functionality. The Sony lens is designated as “SP 70-200mm F/2.8 Di USD”
(5) The XLD (Extra Low Dispersion) glass is made from specialized high-grade glass, which offers greater chromatic aberration correction properties than LD (Low Dispersion) elements.
(6) This rounded diaphragm retains a nearly circular shape even when taken two stops down from its fully open state.
• The most compact full-size, high-speed telephoto zoom lens with VC (Vibration Compensation) image stabilization and USD (Ultrasonic Silent Drive) in its class delivers superior mobility, enabling photographers to capture the previously unattainable.
• Features USD (Ultrasonic Silent Drive) to power a speedy AF drive together with a continuous manual focus mechanism.
• The VC (Vibration Compensation) image stabilization mechanism reduces camera shake to deliver sharp images.
• Moisture-resistant construction helps prevent moisture from penetrating the lens.
The Tamron needs to be better to sell well or be cheaper.


