The Canon EF 1.4X II extender can be used with limited Canon lenses, like the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/2.8L IS II, 70-200 f/4.0L, 70-200 f/4.0L IS USM, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture. The new version II maintains the outstanding optics of the previous version, and adds enhanced weather-resistant construction, and improved anti-reflective surfaces in the barrel.
Please check compatibility with your lens before ordering this item!