The 7Artisans 25mm f1.8 is a small and fast lens designed and manufactured in China for mirrorless cameras. It's built with an all-metal lens barrel with poor quality control and construction. Optically the lens is tuned for a somewhat old school, retro image quality where corner and edge sharpness is sacrificed at the cost of microcontrast and color. All around this little lens is kind of a mess and I'm struggling to decide if it's even worth it.
It would seem almost every year some new Chinese company joins the ranks of lens manufacturers. While there are already a lot of options out there from various lens manufacturers, these Chinese companies are doing something that the main lens designers are not - making little niche designs at some great prices that don't exist anywhere else. For example, this 7Artisans 25mm f1.8 aluminum lens for only $80.