Having an extinction ratio of ER 374, the Schneider 5x5 True-Pol Linear Polarizer is 12- times more effective than other polarizing filters, and is unmatched in its ability to Reduce glare and unwanted reflections, Saturate colors, Deepen blue skies, Improve contrast, and Penetrate haze. True-Pol Polarizing filters enable you to achieve a level of optical performance previously unavailable to cinematographers. The Schneider Optics True-Pol is ideal for cameras such as the RED camera and other 4K cameras.