i have the Tamron 28-75. i'm not really a good photographer (maybe that's the case) but i find the photos are not as sharp (and it is heavy!!) i also have a Sigma 30mm, i love it for solo portraits. for more than 1 person, though, the person behind becomes blurry (again maybe because of my lack of photog skills) but it stays on my camera since i bought it.
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