Teleconverter
From Nikonians Wiki
An optical device, used to increase the effective focal length of a lens, consisting of optical glass. It is mounted between the camera and the lens and usually comes in three different sizes: 1.4X, 1.7X and 2.0X. A 1.4X teleconverter increases focal length by 1.4 times, while a 2.0X increases focal length by 2.0 times. The aperture of the lens is also increased by the same amount as the focal length is increased. For example, a 2.0X teleconverter increases focal length of a 200mm lens to 400mm; however, the aperture of f/2.8 is decreased to f/5.6.
See also Nikonians Tele-converter compatibility matrix
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