> So the 25mm ext. tube from Canon has three extra contacts over the
> Kenko. I don't know what that means. From what I've heard there is no
> difference. So says George Lepp and others. Ray Amos
>
It means that if you put the Canon tube BETWEEN a long L lens and a TC
it will correctly report the aperture whereas the Kenko won't. It only makes
a difference if there is not a TC anywhere in front of the tube and if the TC
is a Canon one or one of the new Kenko Pro or Tamron SP ones.
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