【Optical Glass Construction】 High-quality optical glass lens for superior image clarity and durability. 【Circular Polarizing Filter】 Effectively reduces reflections and glare from non-metallic surfaces like water and glass. 【Enhanced Color Saturation】 Deepens sky blues and enhances cloud contrast for vibrant landscape photography. 【Magnesium-Aluminum Alloy Frame】 Robust, lightweight frame with matte black finish to prevent unwanted reflections. 【Versatile Application】 Ideal for landscape, outdoor, and architectural photography, improving overall image quality. Specifications: Filter Type: Circular Polarizing Filter (CPL) Lens Material: Optical glass Frame Material: Magnesium-aluminum alloy Surface Treatment: Matte black finish Filter Size: 86mm Function: Eliminates reflections, enhances color saturation, reduces atmospheric haze Note: Do not screw the filter too tightly. Over time, due to changes in the surrounding environment, temperature, and humidity, the optical filter may become more tightly attached to the lens. If screwed on too tightly, it may become difficult to remove. When removing the optical filter, avoid touching the lens surface with your hands or hard objects. Instead, grip the filter’s frame and rotate it to unscrew. If the filter is too tight to unscrew, you can use a clean rubber pad, press it gently against the filter's edge, and rotate it as a whole. This should help loosen the filter. After removal, do not leave the filter unattended. Store it promptly in a filter case or a dry box to prevent damage.