Bob Atkins has published their review of the Tamron AF 17-50mm F2.8 SP XR Di II, an image stabilized 3x optical zoom lens (26-75mm equiv.) for APS-C digital SLR cameras. It is priced about US $630, US $400 less than its nearest competitor, the Canon EF-S 17-55/2.8 IS USM, and comes with a 6 year warranty.
Read the full review at: Bob Atkins.