Sigma recently announced two new lenses, the 20mm f/1.4 DG DN Art and 24mm f/1.4 DG DN Art, both of which offer impressive image quality combined with very wide apertures, making them intriguing options for landscapes, astrophotography, and more. This great video review takes a look at the 20mm lens and the sort of performance and image quality you can expect from it in practice.
[ Read More ](Originally posted by Alex Cooke)