B+W 46mm Basic MRC Circular Polarizer Glass Filter for AF LensesProduct Description B+W 46mm BASIC MRC Circular Polarizer Knurled Filter, with a rotating mount to control the polarization effect. The Circular Polarizer will work with all auto focus lenses, and reduces reflections from a non metallic surfaces such as water, glass, and glossy paint and increases color saturation and contrast. Objects behind shop windows or car windshields can become visible again. Specifications size 46mm color Black model 1100742