The Fuji 39mm PRF Protective Filter is a 39mm clear glass filter designed to protect the front element of your lens from dirt, dust and scratches. The Super EBC (Electron Beam Coating) of these would control harmful borrowed light effectively. Super EBC is effectively limiting harmful reflections by achieving a surface reflectivity of 0.3% or less. This Fuji 39mm protective filter has been specially designed for the Fuji X Mount lenses that have a 39mm thread, such as the Fuji 60mm Macro lens.