21mm Group Test (2005)
Olympus 21mm f2 v Sigma 15-30mm v Nikon 17-35mm AFS [published 2004] OK: so everyone knows the best 21mm in the world by a country mile is the Zeiss 21mm, but not everyone can afford one, and not everyone can live with the awkward waveform distortion. So, what most people have come to realise is …