Polarizer PL/CPL
Polarizers include linear polarizers (PL) and circular polarizers (CPL, also described as annular polarizers). Linear polarizer: transmission 41.5%, extinction 99.8%. Circular polarizer: transmission 30%, extinction 99.9%. Additional description, excerpted from the New York Institute of Photography textbook, volume one, P239~240: Unlike most filters, a polarizing filter comprises two glass pieces mounted independently in a circular frame so they rotate relative to each other. Rotation removes increasing amounts of glare and haze; a single-lens-reflex viewfinder shows the change directly. Polarizing filters help remove unwanted glare from nonmetallic surfaces in both color and black-and-white photography. Reflections from glass, water, smooth wood, and satin are polarized, vibrating in one direction. Polarized light looks essentially like ordinary light; the naked eye cannot distinguish them, so unfamiliarity with its appearance is understandable. The scientific term polarization describes vibration in a single plane. The filter blocks this vibration and removes the polarized light. Rotation is required because it allows light that would otherwise pass to be blocked.
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