Designed to increase a lenses distance by an element of 2x, the redesigned Canon Extender EF 2X III delivers optical performance on par with the best Canon super pic lenses. It options a intrinsic personal computer for seamless communication among camera body, lens and extender, options careful lens placement and coatings to reduce ghosting, flare and optical aberration, and even incorporates a new F coating that keeps change of state, smears, fingerprints to a minimum. Extender EF 2X III meets necessary standards in terms of rugged, dustproof and water resistant construction, and will be in each professional's camera bag.