Amazon.com : Sigma 70-300mm f/4-5.6 DG Macro Telephoto Zoom Lens for Pentax SLR Cameras : Camera Lenses : Electronics
Sigma 70-300 mm f/4-5.6 DG OS - LensTip.com
Amazon.com : Sigma 70-300mm F/4-5.6 DG OS SLD Super Multi-Layer Coated Telephoto Lens for Pentax AF Mount Digital SLR Cameras : Camera Lenses : Electronics