Canon EF 28-135mm f/3.5-5.6 IS Image Stabilizer USM 2x Teleconverter (4 Elements) + Nwv Direct Microfiber Cleaning Cloth. 4-elements Multi-coated Optical Glass with anti-reflection coating Doubles focal length of lenses Manufacturers' Lifetime Warranty Item Includes: Case, Protective Lens Cap, Nwv Direct Micro Fiber Cleaning Cloth