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EF Extender

Extender is the name used by Canon for a teleconverter. This high-performance accessory multiplies the effective focal length of the lens used by 1.4 or 2 times. A 200mm lens with an extender 1.4x has, for example, an effective focal length of 280 mm. With the Extender 2x, the focal length is extended to 400 mm. Extenders are only compatible with selected EF lenses, for example with the EF 70-200 mm 1: 2.8L USM, EF 70-200 mm 1: 4L, EF 100-400 mm 1: 4.5-5.6L USM, EF 400 mm 1: 4 DO IS USM and lenses with an L-series fixed focal length of 135 mm or higher.