Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration & is a perfect complement to many of Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens & extender; features careful lens placement & coatings to minimize ghosting & flare & even has a new Fluorine coating that keeps soiling, smears & fingerprints to a minimum. An integral part of many professional systems, Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof & water resistant construction. Product Features Extending a lenses focal length by 1.4x Perfect complement to super telephoto lens Minimal chromatic aberration