Amazon.com : Pentax SMC DA* Series 16-50mm f/2.8 ED AL IF
Amazon.com : Pentax SMC DA* Series 16-50mm f/2.8 ED AL IF,Amazon.com : Pentax SMC DA* Series 16-50mm f/2.8 ED AL IF,Pentax SMC-DA 2.8/16-50 IF ED AL SDM Lens - Pentax-DA 16,71oGxNbSrLL._AC_UF350,,Pentax DA* 16-50mm f/2.8 Review: The Best Lens for the K-3