The protector 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.
Super EBC is effectively limiting harmful reflections by achieving a surface reflectivity of 0.3% or less.
Compatibility
FinePix X100
NOTE
Attach the adapter ring AR-X100 / LH-X100 exclusively designed for X100, then attach the filter.