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Attaching this high-performance Extender to a 135mm or longer lens or to the EF 70-200mm f/2.8L boosts the focal length by 2 times. With seven elements in five lens groups, it preserves the prime lens'' image quality. With the Extender attached, the f-number decreases by two stops. Autofocusing is possible with lenses whose maximum aperture is f/2.8 or faster.
With the Extender attached, the f-number decreases by two stops. Autofocusing is possible with lenses whose maximum aperture is f/2.8 or faster.
