The Fujifilm PRF-52 52mm Filter is designed to protect the lens from dust or dirt. The Super EBC (Electron Beam Coating) of these would control harmful borrowed light effectively. The frame of filter given the semi-gloss black coating fits a high sense design. Or the inner side of filter given the matt black coating restrains a reflection effect and does design well.
Fujifilm PRF-52 52mm Protector Filter for Fujifilm X-Pro1, Fujinon lens XF18mmF2 R / XF35mmF1.4 R