Product Review

Extending a lenses focal length by a factor of 1.4x, 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 new 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. Note: 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. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2x III. Lens Compatibility Chart EF 135mm f/2L USM - AF Possible - EF 180mm f/3.5L Macro USM - AF Possible - The autofocusing range is from 2.6 feet/0.8m to infinity. EF 200mm f/2.8L II USM - AF Possible - EF 200mm f/2L IS USM - AF Possible - EF 300mm f/2.8L IS USM - AF Possible - EF 300mm f/4L IS USM - AF Possible - EF 400mm f/2.8L IS USM - AF Possible - EF 400mm f/4 DO IS USM - AF Possible - EF 400mm f/5.