AGeoJO Offline Upload & Sell: On
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I just taped the pins of my Canon 1.4X TC Mark III and tried it on my f/5.6 lens and all 41 cross-type AF points work flawlessly. I am a happy camper now . How good that works for AI Servo remains to be seen and I am anxious to try that out but on one-shot AF, it nails the focus each time. I do not see any difference in the speed either between with and without the TC and I just tested it inside the house and not outside. If this works on the 5D Mark III, I don't see any reason that it won't on the 1DX .
I believe that Canon feels confident that the new AF system will work reliably with lenses that has a maximum aperture of f/5.6 for AI Servo and that they don't want to specify the reliability of the AF beyond f/5.6. Furthermore, I got the hunch that they didn't want to suggest to Canon users to tape the pins of Canon TCs or to use a generic, non-reporting TC's, like the Kenko but if Canon users want to do that and still get the camera/lens combo to focus to f/8.0 then so be it .
The way it looks, as that thread from dpreview indicates, the OP used a 100-400mm lens with a Kenko 1.4X TC and not with a Canon TC. The Kenko works without taping any pins while the Canon will work but the pins have to be taped. I am not sure about the effect of leaving the tape there and if the TC is used with a faster, let's say, an f/2.8 lens.
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