The Schneider Optics Square 4 x 4" True-Pol Circular Polarizer Filter is a professional-grade optical filter engineered to provide superior glare reduction and color saturation for motion picture, broadcast, and high-end digital cinematography. Featuring an exceptional extinction ratio of ER 374, this filter is 12 times more effective than standard polarizing filters, making it unmatched in its ability to reduce unwanted reflections from non-metallic surfaces such as glass and water while deepening blue skies and improving overall image contrast. The True-Pol circular design incorporates a two-layer construction where the first layer provides the polarizing effect and the second layer features a 1/4-wave retarder plate, effectively preventing viewfinder blackout and cross-polarization issues common with linear polarizers when used on modern cameras with complex optical blocks or beam-splitter viewing systems. Designed specifically for cameras requiring circular rather than linear polarizers, this filter is essential for equipment with polarizing elements in the beam-splitter of their viewing system, such as the ARRI 435 and MovieCam Compact, as well as certain high-definition video cameras including Sony PMW-EX1, PMW-EX3, and PDW-700 models. The filter is crafted from crystal-clear, water-white optical glass, diamond-cut and precision-ground to achieve exceptional flatness and plane-parallelism verified by laser interferometer. Both surfaces feature Schneider's hard anti-reflective (AR) coating, reducing light loss to less than 1% per surface while resisting flaking, peeling, and scratching during demanding production use. The unique Edge Seal process protects against edge-chipping and delamination while reducing edge-reflections and edge-flare. The 4 x 4-inch industry-standard size fits all professional matte box systems and includes a Schneider soft pouch for secure storage and transport between shoots. Read more

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