(1) Try it at infinity focus. Many macro lenses cannot do maximum aperture at close focus.
(2) I'm pretty sure photozone did a review where they noticed that the image was somewhat darker than expected. And I think that Tamron resolved the issue by adjusting the chip. Now, I'm not an expert on this issue and I haven't researched it and I'm sometimes wrong, but it seems that the reported problems could be caused by a non-f/2.0 lens telling the chip that it is f/2.0. So maybe the fix is to correctly report f/2.2 so that it exposes properly.
(3) Its probably still a great lens that I've had my eye on despite the reported weirdness. I'm not really satisfied with my AFS 50 f/1.4G. I could live with f/2.2 if the performance is better.
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