Min aperture for on for 20D?

Discussion in 'Digital SLR' started by you know who maybe, Dec 7, 2004.

  1. I know my Rebel will not autofocus my 100-400 at f/5.6 with my 1.4x TC (at
    f/8.0) but it works fine on my 1D (without taping over pins of course) What
    about the 20D, and what do you call this?
    you know who maybe, Dec 7, 2004
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  2. you know who maybe

    Skip M Guest

    Only the 1 series will AF at a minimum aperture of less than 5.6, i.e. f8.
    The 20D is the same as the Rebel, f5.6. Unless you use a nonCanon TC, like
    Kenko, that doesn't report the correct aperture to the camera. Then it will
    AF, albeit not well, at apertures smaller than f5.6.
    Skip M, Dec 8, 2004
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