Extender EF 1.4x III: w/ Case LP811; For EF 70–200mm f/2.8L IS III USM, EF 70–200mm f/2.8L IS II USM, EF 70–200mm f/2.8L IS, EF 70–200mm f/2.8L, EF 70–200mm f/4L IS II USM, EF 70–200mm f/4L IS, EF 70–200mm f/4L, EF 100–400mm f/4.5–5.6 IS II USM*, EF 100–400mm f/4.5–5.6L IS*, EF 135mm f/2L, EF 180mm f/3.5L Macro, EF 200mm f/2.8L II, EF 300mm f/2.8L IS, EF 300mm f/4L IS, EF 400mm f/2.8L III USM, EF 400mm f/2.8L IS, EF 400mm f/4 DO IS II USM, EF 400mm f/4 DO IS, EF 400mm f/5.6L*, EF 500mm f/4L IS II USM, EF 500mm f/4L IS, EF 600mm f/4L IS III USM, EF 600mm f/4L IS II USM, EF 600mm f/4L IS, EF 800mm f/5.6L IS; *In most cases, autofocus is disabled if extender is combined with this lens. All other lens functions work normally.

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. The Fluorine coating resists soiling, smears and fingerprints. Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.