... depth of shade and sky blue, extrude white cloud, eliminate reflection from nonmetal surface ... balance of color tone. CPL application:1. It makes sky blue.2. It ... camera filter, KODARK camera filter , CASIO camera filter , LEICA camera filter , HASSEL camera filter , KIEV camera filter, ROLLEI camera filter , MAMIYA camera filter, VOIGTLANDER camera filter. photo filter optical filter digital camera ...