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Originally Posted by John N
I am using a canon100-400is lens on a canon 10d and find I need more reach, especially for bird photography. I am thinking about a 1.4 or 2 x converters, probably 1.4.I like the sigma 1.4 converter, but I do not know if it is compatible with this set up. Any advice would be very much appreciated. Thanks John.
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Yup, the Sigma 1.4x does work with the 100-400L.
You will lose autofocus unless you do the trick of taping the pins (do a Google on 'autofocus pins taping' to find the details of this trick). However, AF will be very slow. Yesterday I tried it with a friend's 100-400L and Canon 2x converter. AF was terrible, requiring a bright, contrasty subject at 100mm and not working at all (in fairly dim conditions) at 400mm.