Vivitar 35mm Ultra Fast F/1.4 Wide Angle Lens for Pentax K-S1, K-S2, K-m, K-r, K-x, K-01, K-3, K-5, K-5 II, K-5 IIs, K7, K10D, K20D, K-30, K-50, K100D, K110D, K-500, K200D, K1000, K2000, *istDS2, *istDS, *istDL2, *istDL, *istD, (K-Mount) DIGITAL SLR CAMERA Compatible with Full-Frame and APS-C Aperture Range: f/1.4 to f/22 Hybrid Aspherical Lenses -- Sharp Images Auto Exposure Control and Focus Confirm Manual Focus Design. One Aspherical and Two HR Elements