Correct me if I am wrong, but isnt the whole purpose of getting good glass, sharp wide open, build quality, and fast autofocus. I would not pay 400 dollars for an F2.8 lens that is useless at F2.8, which from my tests the Tamron was completely useless. It seems to me that paying 800 for a lightly used 17-55 still under warranty is a much better deal than the Tamron at 400. furthermore, the Nikon will hold its value much better than the Tamron for when you want to go full frame in the future.
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