Tamron SP 17-50mm f/2.8 XR Di II LensPosted by Digital Photography Live Date June 20, 2012 Product Summary Model name: Tamron SP 17-50mm f/2.8 XR Di II Focus Type: Autofocus / Manual Format : APS-C / Crop Sensor Purchase options: Amazon | Adorama | B&H Overview The Tamron SP 17-50mm...