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Never tried the Sigma 10-20 and therefore can't comment on it, although obviously it's popular.
However I can really recommend the Tokina 11-16 f/2.8. It's more zoom range that it sounds like because at these wide angles every mm of focal length makes a bit difference.
It's a great lens for under £500 because you do get f/2.8 and a very good buid quality, in my opinion much better than Tamron or Sigma
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