0.42x Fish-Eye/Wide-Angle Converter for Pentax *istD, K110D, K20D dSLR 0.42x Wide-Angle Conversion Lens comes with a 52mm Adapter Ring to fit the Pentax 18-55mm DT(and others) Get Wide to SUPER-Wide to FishEye effects Pro Digital Series lens with Steel Barrel construction and Multi-Coated Optics Includes Manufacturer's Lifetime Warranty