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Min aperture for on for 20D? - Photography

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?...

  1. #1

    Default Min aperture for on for 20D?

    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 Guest

  2. #2

    Default Re: Min aperture for on for 20D?

    "you know who maybe" <nguser2uspamnotAOL.com> wrote in message
    news:1Kqtd.10029$_3.117617typhoon.sonic.net...
    >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?
    >
    >
    >
    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 Middleton
    [url]http://www.shadowcatcherimagery.com[/url]


    Skip M Guest

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