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tele-converter

a lens mounted between a camera body and a lens (usually a telephoto lens) to increase the effective focal length of the lens. Also referred to as a tele-extender . Different tele-converters have different magnifying powers, ranging from 1.4 times to 3 times the lens s normal magnification (1.4X to 3X). The effect is to increase the lens s focal length by the degree of magnification, so a 3X tele-converter used on a 50mm lens triples the image size by tripling the effective focal length to the equivalent of a 150mm lens. The disadvantages of using a tele-converter are light loss and, generally, reduced image quality.

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