Schertz - CPL Circular Polarizer Filter for GoPro Hero 9–13 – Multi-Coated HD Glass, Reduces Glare & Reflections, Enhances Contras

Pre-aligned horizontal & vertical polarization position. You can align the white mark on the ring when the camera is in the horizontal position or when the two white marks are the farthest distance when the camera is in the vertical position, that's the best-prolonged polarization position.