The Canon EF 2x II Extender is a high-quality teleconverter that preserves the image quality of the lens it's mounted to and multiplies its focal length by 2x. When combined with pro level EOS cameras & EF supertelephoto lenses with image stabilization, near imperviousness to weather extremes is achieved thanks to rubber gasket seals. Improved antireflective internal coatings also increase transmissivity & performance in backlit conditions.
The 2x extender (also known as a teleconverter) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6. Teleconverters are best used with longer telephoto lenses and are not recommended for lenses wider than 50mm, e.g. 28-105mm (35mm format).
Note: Autofocus will work only if the effective aperture is within the range of the camera (currently f/8 with most EOS cameras).
EF 100-400mm f/4.5-5.6L IS USM
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EF 135mm f/2L USM
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EF 180mm f/3.5L Macro USM
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EF 200mm f/2.8L II USM
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EF 200mm f/2L IS USM
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EF 300mm f/2.8L IS USM
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EF 300mm f/4L IS USM
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EF 400mm f/2.8L IS USM
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EF 400mm f/4 DO IS USM
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EF 400mm f/5.6L USM
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EF 500mm f/4L IS USM
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EF 600mm f/4L IS USM
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EF 70-200mm f/2.8L IS USM
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EF 70-200mm f/2.8L USM
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EF 70-200mm f/4L IS USM
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EF 70-200mm f/4L USM
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| EF 800mm f/5.6L IS USM |
Accessories
