[PRINCIPLE] Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.polarizing filters arrange, and filter, directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light. | [PREMIUM QUALITY] This filter is constructed from optical glass for clarity and color fidelity.The Nano coating associated Circular Polarizer Filter provides an additional layer that results in an improved beading effect when the surface comes in contact with water or oil, allowing for more efficient cleaning. | [COATING] Each glass surface includes Multi-Coating of anti-reflection coatings, which also offer greater protection to the filter substrate and help keep it clean for a longer period of time. | [FRAME] Aluminum-alloy filter ring for durability while remaining lightweight，Filter ring can be rotated to adjust the intensity of the polarization effect.filter threads allow for use with other filters. | [OTHER] Top knurling to provide a more textured grip when mounting or removing it from a lens，If you have any questions about Haida products, you can contact us at any time.