Rodenstock 405240 52mm Slim Circular Polarizer Brass Mount Super Multi-Coated Black Label Filter Uses high-performance polarizing film free of veiling and with a neutral color effect to ensure no loss of image definition as well as unaltered colors and the lowest possible light loss The polarizing film and the l/4 layer are cemented between absolutely plan parallel glass plates to avoid reflections at the glass/air interface as well as further light losses and scattered light. Both outer surfaces are incredibly smooth, hardened and MC coated, including a nano coating to repel dust and water The black anodized brass slim line rotatable mount is so unobtrusive that it does not cause any igniting even in shots with most wide-angle lenses Mount has front thread for a lens hood and a lens cap.