UV Protective Filter: Prevents loss of sharpness and contrast by filtering out UV rays and Haze. Protects Lens from scratches, scuffs and smudges CPL Circular Polarizer Filter: Uses Polaroids patented Polarizing technology to give you total on location control of color saturation, make skies bluer, grass greener-even eliminate surface reflections from glass and water - all with picture perfect results FLD Fluorescent Filter: Eliminates that annoying greenish which fluorescent lights add to photos