Pro-1D Slim CPL filter 49mm,52mm,55mm,58mm 1)OEM is acceptable 2)made of Optical glasss 3)various sizes for your choice Pro-1D Slim CPL filter 49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm,86mm Ultra thin 1mm glass and 3mm front frame. size:49mm-82mmThis CPL filter is used to increase colour saturation, darken blue skies so white clouds stand out. and eliminate reflections from non-metallic ...