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Originally Posted by postcardcv
Well I got a Kenko 1.4x tc for use with my 350D and my Sigma 500 - having looked into tc's I decided to ask for the Kenko as it is a 'dumb' converter and so should allow auto focus... I tried it for the first time yesterday and (typically) it does give the correct info to the camera, so does not allow AF. I can't quite work out why this is as I've spoken to someone else who uses the exact same set up and does get AF... now wishing I'd asked for the Sigma!
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I would investigate firmware updates for the sigma lens. I don't use this system but I know Sigma have the ability to 'update' lenses.
Worth a go?