Canon 17-55 IS and Sigma 17-70
Weird question, someone asked me if the canon 17-55 is wider than the sigma 17-70 because of the EF-S mount...is this true? i only thought wideness had to deal with the 17mm x1.6 crop factor...and that would be the same on both lenses on the same canon xti. Could anyone shed some insight? thanks!