Polarizing Filter, Ultraviolet. Enhancement of Natural Colors. The CPL filter significantly improves contrast and saturation, providing vibrant colors in your photos. The imported polarizing film eliminates 99.9% of reflections from non-metallic surfaces, offering HD optical experiences and low light reflectivity. 30 surfaces with Multi-resistant Coatings. Ultra-thin frame and smooth rotation. The extremely thin 5.9mm frame is made of magnesium alloy.