CPL polarizer function: eliminate the surface reflection of non-metallic objects, increase the saturation, restore the true color, make the blue sky more blue, the water more thorough, and the plant color more realistic. The CPL filter lens can increase the saturation of the object. Add a polarizer in front of the camera lens before shooting and rotate it to the desired angle to make the subject more saturated.This ultra-thin polarizer adopts imported optical glass materials to ensure a more stable color balance of light transmittance. To prevent overexposure, the polarizer can be used as a gray filter, which can reduce the light transmittance of the lens without affecting the normal color reproduction of the work. Universal clip-on design, easy to secure lens firmly on your device. Portable and detachable, you can take pictures with your devices at any time during traveling. Lens fixed focal length: 37 Millimeters