【Optical Glass Construction】 High-quality optical glass ensures superior light transmission and image clarity. 【Circular Polarizing Filter】 Effectively eliminates reflections from non-metallic surfaces like glass or water, enhancing color saturation and contrast. 【Sky Enhancement】 Deepens the blue of the sky while making clouds more prominent, creating stunning landscape photographs. 【Haze Reduction】 Minimizes atmospheric haze in landscape photography without altering overall color balance. 【Durable Design】 Magnesium-aluminum alloy frame with matte black finish prevents unwanted reflections and ensures longevity. Specifications: Filter Type: Circular Polarizing Filter (CPL) Lens Material: Optical glass Frame Material: Magnesium-aluminum alloy Surface Treatment: Matte black finish Filter Size: 67mm Function: Eliminates polarized light, enhances color saturation 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.