The Extender EF 2x III increases the focal length of a lens by a factor of 2x while still delivering superb image quality. This tele extender can be used with fixed focal length lenses 135mm and longer, 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.The Extender EF 2x III increases the focal length of a lens by a factor of 2x while still delivering superb image quality, and reduces its effective aperture by two stops. AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture. Compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera.
Accessories supplied with lens:
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Front lens cap
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Rear lens cap
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Soft padded case