Canon 4409B002 Extender EF 1.4X III for EF Lenses

Extending a lenses focal length by a factor of 1.4x, the Canon Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of 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 and flare and even has a Fluorine coating that keeps soiling, smears and fingerprints to a minimum. An integral part of many professional systems, Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.Canon 4409B002 Extender EF 1.4X III Specifications:Focal Length & Maximum Aperture: Magnification:1.4xLens Construction: 7 elements in 3 groupsMax. Diameter x Length: 2.8" x 1.1" (72 x 27.2 mm)Weight: 7.9 oz (225 g)NoteNOTE: This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Canon 4409B002 Extender EF 1.4X III for EF Lenses.