Canon Extender EF 2x III

Teleconverter that doubles the focal length of compatible Canon L-series lenses 135mm and longer, as well as select 70-200mm zooms. Optical design with coatings to minimize ghosting, flare, and chromatic aberration. Built-in microcomputer for seamless communication between camera, lens, and extender. Dustproof and water-resistant construction with fluorine coating.