Image courtesy: Kurtmunger.com
Kurtmunger (Click here) tested the Tamron SP AF 70-200mm f/2.8 lens on the Sony A700 and A900: “Build quality is not great like the Sony, and the slot/screw drive focusing system is slow, but pretty accurate. Unfortunately, there are no focus hold or focus limiter buttons to help out, that’s the down side. On the up side, the lens performs very well optically, with relatively low distortion, good control of both axial and lateral color fringing, although color fringing is noticeable along the sides at the short end to about 135mm.”
For comparison: You can also read the Sony 70-200mm f/2.8 review at Kurtmunger and Photozone.
The Tamron lens costs $769 at BHphoto (Click here)
The Sony 70-200mm f/2.8 SSM Lens is just a little bit more expensive….$1,799.00 (!) at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).