Schneider 138mm Lin-pol Filter
Schneider 138mm Round Drop-In Linear True-Polarizers Filter (p/n 68-013038) . This is by far the most effective polarizer for motion picture and television cameras. Having an extinction ratio of ER 374, the Schneider True-Pol is 12- times more effective than other polarizing filters, and is unmatched in its ability to:
Reduce glare and unwanted reflections
Deepen blue skies
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.