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auto-focus with Canon 100-400mm lens and 1.4x teleconverter

have 100-400 canon lens what do i have to do to get the af to work when i put a 1.4 converter on it canon 20 d camera thanks RAY

ray smith
Sun, 23 Jul 2006 05:08:35 -0700

ray, your Canon 100-400mm L lens has a constant aperture of f/5.6. That is also the smallest aperture that your Canon EOS 20D can auto-focus at. With a 1.4x teleconverter, your lens will have an aperture of f/8. There is one trick that will allow your 20D to auto-focus with a f/8 lens, but you may not get satisfactory results. See the "canon20D extension" thread.

Chieh Cheng
Mon, 24 Jul 2006 00:15:19 -0700

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