2x (Doubler) 7-Elements Teleconverter for Canon cameras is a precision optical component designed to expand your photographic capabilities. This premium quality 2x teleconverter, effectively doubles the focal length of the lens it's used with and maintains the resolution and contrast of any fine optic. A 7-elements teleconverter will deliver sharper images with more depth compared to those with fewer elements.The 2x teleconverter extender 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 200mm lens will effectively increase the focal length to 400mm. A lens set to f/3.5 will now be f/7.0. For use with Canon EF lenses not EF-S lenses.
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