The circular polar filter is one of the most commonly used filter types. By using it, we get stronger and clearer colors, especially on a bright sunny evening, the difference is noticeable. The blue skies seen on classic postcards are also usually made with a polar filter. The polarizing filter can also be used to reduce reflections on non-metallic surfaces and to protect against UV radiation that causes blur, and it also has a contrast-enhancing effect. Since it reduces the amount of light entering the lens, it is not suitable for protecting the front lens of the lens (continuous use).