4.5" Round Drop-In Circular Polarizing Filter with Anti-Reflection Coating. Lindsey Optics Brilliant-Pol Polarizing filters are designed for specifically for cinematography and are available in all of the standard professional filter sizes. They are extremely efficient at reducing reflections on glass and water. They also can saturate blue sky and increase color saturation in landscapes by reducing micro-reflections in the scene. With Brilliant-Pol polarizers you have more choice about how much reflection to remove, in order to tell your story better. The Brilliant-Pol product range includes Linear Polarizers and Circular Polarizers in 5 professional sizes. The rock-hard 7 layer anti-reflection coating which eliminates filter to filter reflections and reduces stray light, improving contrast and color saturation.