PolarPro Arctic CP Filter 67mm Benjamin Hardman Series CPL Circular PolariserArctic CP Filter Benjamin Hardman Series 67mm ARTC CP 67 Built for the extremes. The Arctic CP Filter was designed in collaboration with photographer Benjamin Hardman, who needed a polarizer that could pull every last bit of light when shooting in the harsh, lowlight environments of the Arctic. Featuring a unique 45% light transmission, about a half stop brighter than traditional polarizers, this filter ensures you capture more detail in every frame.