The Schneider 4 x 4" Linear True-Pol Polarizing Filter is by far the most effective polarizer for motion picture and television cameras. Having an extinction ratio of ER 374, the Schneider Linear True-Pol is 12 times more effective than other polarizing filters and is unmatched. Reduce glare and unwanted reflections Saturate colors Deepen blue skies Improve contrast Penetrate haze True-Pol Polarizing filters enable you to achieve a level of optical performance previously unavailable to cinematographers