Hoya 49mm Alpha Circular Polarizer Filter

OverviewAbout this Item Circular Polarizer Filter3 to 4x Filter Factor, +1.6 to 2 StopsHelps to Eliminate Reflections and GlareReduces Haze in LandscapesGreater Color and Tonal SaturationNon-CoatedOptical GlassAluminum Frame49mm Front Filter ThreadsPlastic CaseWhat's in the box Hoya 49mm alpha Circular Polarizer FilterPlastic Filter CaseLimited 1-Year WarrantyThe Hoya 49mm alpha Circular Polarizer Filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges, and filters, this directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces and an increase in the saturation of skies and foliage.