Road Train !!!!!!!!!!

by Russell McMahon

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Tamron 17-50 f2.8 lens vs Canon 17-40mm 4.0 lens

How is the quality of the Tamron 17-50mm f2.8 lens? Specifically, is it comparable to the Canon 17-40mm lens, in the following measurements. Overall quality (Blur, aberrations, etc) Parallel lines ...