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Comments about Sigma Sigma 20mm f/1.8 EX Aspherical DG DF RF AutoFocus Super Wide Angle Lens with Hood for the Maxxum & Sony Alpha Mount.:
This lens is sharp and tasty for landscape, portrait with a group of people, blue hour fotographing. I´ve tested it on deers in the dark swedish summernight´s, togheter with a tripod and a good camera just like Sony A900 it works overall well.
The F1.8 is very good to have when the light disapere.