The Sigma 1.4x DG EX APO Tele Converter for Canon (also known as a tele-extender) will multiply the focal length of the existing lens by 1.4x, and will cut back the amount of light by one f/stop. For example, using a 1.4x teleconverter with a 300 mm lens will effectively increase the focal length to 420mm. A lens set to f/2.8 will now be f/4.
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Sigma 1.4X APO EX DG Teleconvertor Lens
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