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Message: <blockquote data-quote="paul goode" data-source="post: 1294405" data-attributes="member: 5522">Camera problems are inevitably highlighted on internet forums but I'm pretty certain the vast majority of 40Ds (and everything else) work fine and error99s are few and far between. There is not a focus issue with tc's. They aren't meant to AF at f8 so its hardly surprising if they don't. I'm sure canon would love to design in a feature to detect all tc's and totally shut down the AF with slow lenses. Then they can't be blamed for a problem that doesn't exist edit: Oops, snap!</blockquote>