This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4× II). Features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4× II. The EF 2× II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. With the EF 2× II, AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture, and compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera.
Note When used with the EOS 5/A2/A2e camera, exposure compensation must be set to - 0.5 EV with the 1.4× II or - 1.0 EV with the 2.0× II. Autofocus will work only if the effective aperture is within the range of the camera (currently f/5.6 with most EOS cameras but f/8.0 with EOS 3 & 1V).
Compatibility
EF 70-200 f/4L*
EF 70-200 f/4L IS*
EF 70-200m f/2.8L
EF 70-200mm f/2.8L IS
EF 100-400mm f/4.5-5.6L IS*
EF 135mm f/2L
EF 180mm f/3.5L Macro*
EF 200mm f/1.8L
EF 200mm f/2.8 I & II
EF 300mm f/2.8
EF 300mm f/4L*
EF 300mm f/4L IS*
EF 400mm f/2.8
EF 400mm f/4.0 DO IS*
EF 400mm f/5.6
EF 400mm f/5.6L*
EF 500mm f/4.5
EF 500mm f/4L IS*
EF 600mm f/4.0
EF 1200mm f/5.6
* In most cases, autofocus is disabled if extender is combined with this lens. All other lens functions work normally.
We only sell brand new USA retail Canon Extender EF 2× II Lens Converters. This Canon EF Lens Converter comes complete with a 1 Year USA Limited Warranty.
Can be shipped to APO/FPO 
