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I have tested it against a Canon 2,8/200mm L II lens and a Sigma 2,8/50mm. In non-macro-situation, especially wide open, the Canon is better. In MAcro-Situaions the Tamron is better than the Sigma when it is in focus. The DOF is simply to small for me. But when it is in focus, it gives you a micro-resolution which simply let you look again and agin to the picture. Picture ask for your attentation as there is too much to discover, while the SIgma is as well nice, but has not this level of differentiation. So, I will go and buy the Tamron 90mm Di now with the hope, that it has this snap-scharakter as well.
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