Item Includes Lens Caps, LP811 Lens Pouch Description Designed to extend a lenses focal length by a factor of 2x, the redesigned CanonExtender EF 2X III delivers optical performance on par with the finest Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and extender, features careful lens placement and coatings to minimize ghosting, flare and chromatic aberration, and even has a new Fluorine coating that keeps soiling, smears, fingerprints to a minimum. Extender EF 2X III meets necessary standards in terms of rugged, dustproof and water-resistant construction, and should be in every professional's camera bag. Specifications Focal Length & Maximum Aperture Magnification: 2.0x Lens Construction 9 elements in 5 groups Max. Diameter x Length 2.8 x 2.1 in. / 72.0 x 52.7mm Weight 11.5 oz. / 325g Coating Minimizes ghosting, flare and chromatic aberration, with new Fluorine coating Other Dustproof / Water-Resistant