This high-performance extender increases the lens’s focal length by 1.4 times. Not only does the actual F-stop value drop only one step when the extender is used, but autofocusing is also maintained with most lenses, which makes the extender extremely useful when you need to maintain brightness or mobility. The interior of the lens barrel has been treated thoroughly against reflections, employing a flare-reducing high image quality design. The Extender EF 1.4xII features dust-proof and drip-proof construction.

NOTE: Compatible lenses: single focal length L-series lenses 135mm and up, as well as the EF100-400mm f/4.5-5.6L IS USM, the EF70-200mm f/2.8L IS USM, the EF-200mm f/2.8L USM, the EF70-200mm f/4L IS USM, and the EF70-200mm f/4L IS USM.