1) This 40.5mm Camera UV Filter will fit any brand of lens with a 30.5mm filter thread, digital or film 2) The SLR UV filter protects your camera lens from dust, moisture, scratches and fingerprints 3) Camera UV filter absorbs ultra violet rays without an increase in exposure to provide a clearer picture as well as protection for your costly lenses 4) Double threaded UV lens for use with a lens hood or another filter 5) Enhanced optical resolution 6) Multi coated optical glass 7) The Camera UV Filter can be left on the lens at all times 8) Size: 40.5mm(Dia.)