I've been using this converter for a couple of years now, on my sigma 100-300mm f4, 120-400mm 4.5/5.6, and recently on my new Nikon AF-S 300mm f4. Works great on all of them. Fast auto focus (maunal on the 400mm sigma) sharp as the original lens.
The only downside is on the Nikon AF-s the readout says f4 when it should say 5.6 and the data says 300mm focal length instead of 420mm.(its not designed for this lens but produces shots as sharp as the 300mm without the converter) It auto focuses accurately and light meters correctly . Considering you can pick these up for less than half the price of a nikon tc its a steal, Just make sure you get the DG model which is optimized for long telephotos.Get more detail about Sigma APO Teleconverter 1.4x EX DG for Canon Mount Lenses.
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