Explain CPL Filter

A CPL (Circular Polarising Lens) filter is an optional accessory that fits over the dashcam's lens to reduce unwanted reflections and glare from the windscreen and dashboard. By filtering reflected light, a CPL filter can improve image clarity, increase contrast, and make details such as vehicles, road markings, and scenery easier to see—particularly in bright, sunny conditions. While it slightly reduces the amount of light entering the lens, a correctly adjusted CPL filter can significantly improve daytime video quality in many vehicles.