Sigma 20mm F2 DG DN Review: Luxury Design, Killer Astro

While Sigma has a reputation for its Art line, it's the I-series of lenses that always catch my interest for one main reason: Metal. Like the others in the series, the new Sigma 20mm f2 DG DN is a prime lens with a beautiful metal barrel and a dedicated aperture ring. While it looks luxurious on the outside, it houses some pretty solid optics inside that capture sharp, punchy images.