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Schneider 4x4 inch circular polarizer filter, square glass with neutral tint

SCHNEIDER

SCHNEIDER 4x4" True-Pol Circular Polarizer Filter 68-013144

SKU CH-D6Z6-BE8XT

A 4x4" circular polarizer with an extinction ratio of 374, making it 12 times more effective at reducing glare and saturating colours

  • Extinction ratio 374 cuts glare 12× more effectively than standard polarizers
  • Diamond-cut water-white glass verified by laser interferometer for exact parallelism
  • Densitometer-checked density plus spectrophotometer-tested transmission ensure filter-to-filter consistency
  • Professional 4×4″ circular polarizer built for motion-picture and television cameras
  • Ultra-durable construction maintains precision through long-lens cinematography workflows

Professional Glass Filter

The Schneider 4x4" True-Pol Circular Polarizer is a professional-grade filter built for cinematographers and photographers who require precise glare reduction and colour saturation. It is designed for motion picture and television cameras where optical accuracy is critical. This filter is not for casual shooters who need a lightweight screw-on option for small-diameter lenses.

Extinction Ratio 374

The single specification that determines suitability is the extinction ratio of ER 374, making this polarizer 12 times more effective than standard filters. This figure defines its unmatched ability to eliminate unwanted reflections and deepen blue skies. Buyers who need a lower extinction ratio for subtle effect should consider a different filter class.

Laser Verified Flatness

Under sustained production use, the filter maintains optical integrity through diamond-cut, water-white glass verified by laser interferometer for precise flatness and plane-parallelism. Consistent density is confirmed by densitometer and spectrophotometer testing, ensuring reliable light transmission when swapping filters mid-shoot. It is not built for environments where frequent physical impact risks chipping the precision edges.

Highlights

  • Extinction ratio 374 cuts glare 12× more effectively than standard polarizers
  • Diamond-cut water-white glass verified by laser interferometer for exact parallelism
  • Densitometer-checked density plus spectrophotometer-tested transmission ensure filter-to-filter consistency
  • Professional 4×4″ circular polarizer built for motion-picture and television cameras
  • Ultra-durable construction maintains precision through long-lens cinematography workflows

Specifications

No published specifications for this item yet.

Questions about this item

How does the extinction ratio of 374 affect image quality in the camera?

An extinction ratio of ER 374 means this polarizer blocks reflected glare and unwanted reflections about 12 times more effectively than standard polarizers, giving deeper blue skies, richer colour saturation and higher contrast straight out of the camera.

What filter mounting system does the 4x4 inch size use?

The 4x4 inch dimensions fit standard professional matte boxes and filter trays that accept 4x4 inch square or rectangular filters, sliding into the designated slot without additional adapter rings.

What physical clearance is needed to slot this filter into a matte box?

The filter is diamond-cut from water-white optical glass ground to precise flatness and plane-parallelism, so it matches the standard 4x4 inch thickness tolerance used by professional matte boxes and filter holders.

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