Canon Extender EF 1.4X II

This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, 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.

Compatible with: EF 135 f2L, EF 180 f3.5L Macro, EF 200 f1.8L, EF 200 f2.8L, EF100-400 IS, EF 300 f2.8L, EF 300 f4L, EF 300 f2.8L IS, EF 400 f2.8L IS, EF 500 f4L IS, EF 600 f4L IS, EF 400 f2.8L, EF 400 f2.8L II, EF 400 f5.6L, EF 500 f4.5L, EF 600 f4.0L, EF 300 f4.0 IS, EF 70-200 f2.8L and EF 70-200 f4L