Optical filterW
Optical filter
Astronomical filterW
Astronomical filter
Atomic line filterW
Atomic line filter
Band-stop filterW
Band-stop filter
CokinW
Cokin
Color gelW
Color gel
Color wheel (optics)W
Color wheel (optics)
Dichroic filterW
Dichroic filter
Dielectric mirrorW
Dielectric mirror
EnChromaW
EnChroma
Graduated neutral-density filterW
Graduated neutral-density filter
Infrared cut-off filterW
Infrared cut-off filter
Interference filterW
Interference filter
Dextrorotation and levorotationW
Dextrorotation and levorotation
Liquid crystal tunable filterW
Liquid crystal tunable filter
Neutral-density filterW
Neutral-density filter
Photographic filterW
Photographic filter
Polarizing filter (photography)W
Polarizing filter (photography)
Selective surfaceW
Selective surface
Tiffen (company)W
Tiffen (company)
UV filterW
UV filter
Wratten numberW
Wratten number