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Well, put it this way, it has worked perfectly until now. However, the only other lens which has SDM that I was able to test it on was the damaged 16-50 that it came with, which would only focus using screwdrive as well, not SDM. But seeing as that was the only lens I had with SDM at the time, I put it down to the lens being damaged. It wasn't until I bought this 2nd lens that I realized it was an issue. Whether they didn't fix the SDM when I sent it away, or whether the damage has happened since, I don't know. I was merely trying to find the most likely explanation for the SDM contacts failure.
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