I've been using the Tamron 28-75mm f2.8 and I love it. As far as how good they are is subjective to who you talk to. I was talking to one of the sales people at Calumet and he stated that Tamron is the best of the three with sigma next and tokina last, but that is his thoughts? I'm looking hard at the sigma 30mm f1.4 as my next len's.
Mike
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