Pentax HD Pentax DA* 11-18mm f/2.8 ED DC AW Lens K-Mount Lens/APS-C Format, 17-27.5mm (35mm Equivalent), Aperture Range: f/2.8 to f/22, Two Aspherical Elements, Two ED Elements, One ED Aspherical Element, Aero Bright II and SP Coatings, DC Autofocus...