UV filter: Prevents loss of sharpness and contrast by filtering out UV rays and Haze and protects Lens from scratches, scuffs and smudges
CPL filter: (Circular Polarizer lens) Filter is essential for outdoor photography, deepens intensity of blue skies, reduces or eliminates glare from water, glass and non-metallic objects
FLD filter: (Fluorescent) allows for using your camera under fluorescent lighting, resulting in natural colors when shooting in indoor conditions