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I see that the 5D Mk III has a soon to be released firmware update (version 1.1.4) which will allow AF on lens and convertor combinations up to combined max aperture of F8. Firmware Update Info
The 400mm 5.6L shows in charts Ive looked at as only being manual focus with a 1.4X convertor attached.
Has anyone any views if the 400mm 5.6 L with a 1.4X convertor will achieve AF with this firmware update without taping pins etc
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Are you using a Canon tc or a third party (Kenko / Tamron)?
The Canon tc tells the camera that the minimum aperture is f5.6 or f8 and the camera will refuse to AF - when you tape the pins you are effectively cutting the communication that goes through those pins. If you use the Kenko/Tamron tc they do not communicate that information (the pins don't do the same job) so even on my 7D+70-300 at 300mm (f5.6) the camera will try and AF and in really good light it can hit the target. I see no reason that if the firmware allows you to AF up to f8 then camera will do so with the Canon tc without taping any pins.
The link you've posted already answers your question.......yes it will achieve AF.
Thanks Mike and Roger
I was just looking for confirmation on this
well done Lawbert for bringing this to my attention , owning a 5d mkiii myself and a canon 600mm f4 l is usm I wonder if i can stick a 2x converter on and still retain auto focus .
Keep me informed when it comes out please .......
Quote: Keep me informed when it comes out please .......
5 days left in April...Canon are running out of time if they want to keep to the published release date..
I've heard that serviced camera are being returned with the firmware upgrade installed
True that is how I got my new firmware updated to 1.2.1
Now it will AF at f/8 with my 2x extender
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