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the 17-50 is at a whole different price point and quality, or so the reviews say. it also has OS.
the non VC tamron is sharper than the VC one. i find the corners to be not sharp. i think my canon 17-55 IS is sharp edge to edge (the sigma is said to be even better at certain apertures), but others on here have discredited the 17-55 IS.
i'd keep the 17-70 and get something like a 30mm 1.4 or that 50 1.4 u were talking about.
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