I'm just testing a Tamron 200-500mm for a magazine, it is a very good lens that knocks the spots off the Sigma, I'd probably cut about 2 inches off the hood if it were mine as this causes some vignetting when the lens is used on a full frame (1Ds MkII) body, but with smaller sensors there is no such problem and the results are sharp, vibrant and have good contrast and colour accuracy.
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