【Polarizing Filter】 Circular polarizing filter (CPL) designed to eliminate reflections and enhance color saturation in photography. 【Optical Glass Construction】 Made with high-quality optical glass for superior light transmission and image clarity. 【Durable Frame】 Constructed with magnesium-aluminum alloy for lightweight durability and longevity. 【Anti-Reflective Finish】 Matte black surface treatment on the frame to prevent unwanted reflections. 【Versatile Application】 Ideal for deepening sky blue, enhancing cloud contrast, and reducing glare from non-metallic surfaces like water or glass. Specifications: Filter Type: Circular Polarizing (CPL) Lens Material: Optical glass Frame Material: Magnesium-aluminum alloy Frame Finish: Matte black, anti-reflective Filter Size: 77mm Function: Glare reduction, color enhancement, reflection elimination 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.