Includes Scheider Pouch. The filter has a thread on one side and can also be used in some matte boxes that have the 138mm circular bellow such as Chrosziel. 

The Schneider 138mm True-Polarizing Glass filter 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.

-Reduce glare and unwanted reflections

-Saturate colours

-Deepen blue skies

-Improve contrast

-Penetrate haze