For Kennygee,
I have the 105/2.8 sigma (nikon fit) and the 1.4x sigma apo converter.The two DO NOT fit together, because the rear element of the lens protrudes out of the lens tube, and the front lens element of the converter also protudes, thus the two CANNOT be physically joined.The Kenko 1.4x does fit and also retains meter, and AF functions.The Kenko converter is of a different "design" ie the lens elements are recessed well back inside the converter and therefore allow the 105 to fit inside the converter.
The 50-500 sigma has a zoom lock which I think inhibits the zoom from working in the 50-100 (not sure of exact nos) range when a sigma converter is fitted , this is to stop the rear element of lens crashing into the front element of the converter.So ineffect you end up with 100-500 lens plus the multi factor of your converter. You should be able to confirm the above from the Sigma site.
regards Subzero
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