Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses

The Canon Extender EF 2x III is designed to extend a lens's focal length by a factor of 2x, delivering 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, and has a 9 elements in 5 groups lens construction. The lens is designed to minimize ghosting, flare, and chromatic aberration, and features a new Fluorine coating that keeps soiling, smears, and fingerprints to a minimum. It is also dustproof and water-resistant, making it a robust addition to any professional's camera bag.