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...