Extender EF 1.4x II, 220g
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, 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.
Canon Extender EF 1.4x II, 5/4
Canon Extender EF 1.4x II. Lens structure: 5/4. Compatibility: EF 100-400mm f/4.5-5.6L IS USM EF 135mm f/2L USM EF 180mm f/3.5L Macro USM EF 200mm f/2.8L II USM.... Product colour: White. Diameter: 7.28 cm, Length: 27.2 mm, Weight: 220 g