Paraluce 43mm per Canon EF-M 22mm f/2 STM Fuji XF 35mm f/2 R 23mm f/2.0R WR
Back Thread : 43mm. Front Thread: 43mm. All lens with 43mm filter thread (standard focal length lens). Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens.