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Originally Posted by postcardcv
I'm interested to hear that you use a 2x tc with your macro lens as I'd been wondering about trying this (though I don't have the tc yet). I use eth Sigma 105 f2.8 so assume I'd still retain auto focus with a 2x, do you know if this is the case?
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Yes, my Canon 100mm f/2.8 macro lens + Kenko 2x teleconverter combination allows me to retain autofocus when used with my Canon 20D. The autofocus is slow and hunts a bit but it works.
What will happen with your lens on your camera body I have no idea. f/2.8 + a loss of 2 stops from using the teleconverter gives you a f/5.6 lens. Which, with many cameras, is the limit on autofocus.
But ... I never use autofocus with macro shots! Considering the razor thin depth of field that we work with at these short distances manual focus is needed to give the focus exactly where I want it. And, since I'm on a tripod anyway, it really is no problem.