ProMaster 77mm Circular Polarizer - BasisProMaster 77mm Circular Polarizer Basis ProMaster SKU: 70449 Helix SKU: PR704490 OVERVIEW The ProMaster 77mm Basis filter can be used to remove or control reflections, improve contrast & saturation, or darken blue skies. A CPL filter is a valuable creative tool. Its quality should complement your lens by handling light well and providing a clear, sharp image to the cameras digital sensor of film. Polished optical glass, a special multi coating
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