Question about Canon Extender EF 2x II Lens Converter
You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).
Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."
Posted on Aug 15, 2010
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Posted on Jan 02, 2017
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