Tamron A16 - Zoom lens - 17 mm - 50 mm - f/2.8 XR Di II - Pentax K

Product DescriptionDi II: Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of the Di products. These lenses are not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm. The SP AF17-50mm F/2. 8 is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras. In addition, portrait shots are made beautiful with the natural out-of-focus effect

Source: Digital Camera and Video Store...