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Okay just got my Canon EF 17-40mm f/4L USM but someone just offered his Sigma 12-24mm f/4.5-5.6 DG II HSM for the same price $340, just now.
Should I get it as well or I shouldn't bother?
I'll be using it with my Canon EOS 6D and Speedlite 430EX II for nightclub photography...