Canon EF 1.4X III Telephoto Extender for Canon Super Telephoto Lenses

The Canon Extender EF 1.4x III extends a lenses focal length by a factor of 1.4x. Extender EF 1.4X III accommodates phenomenal optical performance with minimal chromatic aberration and is an ideal complement to many of Canon super telephoto lenses. It includes a built-in microcomputer for seamless communication among camera body, lens and extender; features careful lens placement and coatings to minimize ghosting and flare or even has a new Fluorine coating that assists in keeping soiling, smears and fingerprints to a minimum. An integral a part of many professional systems, Extender EF 1.4X III maintains high standards not only optically, but additionally when it comes to rugged, dustproof and water-proof construction. This lens is only compatible with fixed focal length L-series lenses 135mm and over, in addition to the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L
Focal Length & Maximum Aperture Magnification: 1.4x
Lens Construction of 7 elements in 3 groups
Max. Diameter x Length – 2.8″ x 1.1″ (72.0mm x 27.2mm)
Weight – 7.9 oz (225g)