There has been a flurry of third-party 'fast' 50mm lenses for the mirrorless cameras. Designs with apertures such as f/0.95, f/1, and f/1.1 are seen. So far, reports and reviews tend to show these lenses are not very good optically speaking. However, some of the makers obviously mean serious business and brands such as Viltrox and Laowa have released unusual designs which excellent performance.