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These Canon teleconverters connect between the SLR body and lens and increase the focal length of your Canon lens by either 1.4 or 2 times depending on the converter model being used. These converters are only compatible with Canon L series lenses. A stop or two of light is lost when using a teleconverter.

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Kenko teleconverters are available in various magnifications and multiply the effective focal length of an attached lens by a factor. For example, a 200mm lens with a 1.4x teleconverter has an effective focal length of 280mm: with the 2x teleconverter, this increases to 400mm. Not all lenses will retain auto focus with a teleconverter attached and you will loose 1-2 stops of light depending on which teleconverter is being used.

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These teleconverters increase the effective focal length of the lens currently in use. Compatible with AF-I and AF-S Nikon lenses they increase the reproduction ratio and shorten the depth of field of the lens in use without affecting the closest focusing distance. A stop or two of light is lost when using a teleconverter.

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A teleconverter increases the focal length of the lens currently in use by either 1.4x or 2.0x - depending on the particular model. You do lose a stop or 2 of light when using a teleconverter. A teleconverter is ideal for sports and nature photography, you can turn your Zuiko 300mm f2.8 into a 420mm f4 (35mm equivalent 840mm f4.0) by just attaching the teleconverter inbetween the body and lens.

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These Sigma teleconverters connect between the SLR body and lens and increase the focal length of your Sigma lens by either 1.4 or 2 times depending on the converter model being used. A stop or two of light is lost when using a tele converter. Only compatible with certain EX series lenses, please check compatibility on Sigma's site here.

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