Here, we take a look at Sigma’s answer to the problem with the UK’s exclusive first look at the all new 10-20mm f/4-5.6mm zoom, a true ultra wide zoom for dSLRs. This lens is designated to ...

Sigma 20mm F/1.4 DG DN Art Verdict There are some terrific ultra-wide primes around, and the Sigma 20mm f/1.4 DG DN Art lens is definitely up there with the best. It's true that 20mm is quite wide ...