Polarizing 2017-06-07T13:19:18-07:00

Polarizing filters reduce reflection, enhance contrast and detect imperfections in transparent materials. They’re best used for applications that have overwhelming reflection when inspecting objects on shiny surfaces.

Light reflected from a non-metallic surface becomes polarized, sometimes to the degree that a strong glare is created. A linear polarizer rotated to pass only light polarized in the direction perpendicular to the reflected light (the glare) will absorb much of it. Aside from reducing reflections, polarizers help to improve contrast by reducing dynamic range, allow for evaluation of stress in transparent plastic and glass, and can be used in pairs to form a variable neutral density filter.

For smooth surfaces or surfaces covered with grease, oil, or liquid, achieve the best results by using a polarizing filter over the lens in conjunction with polarizing film or polarizing glass sheet over the light source. Most polarizers are wavelength range specific; visible or infrared polarizing filters or filter sheet materials are offered.

Light used to image any nonmetallic surface will produce polarized light in reflection, therefore the use of linear polarizers can often result in appreciable benefit in industrial imaging applications.

JNS Glass


  • Available in both Linear and Circular for imaging in the Visible and Near-IR
  • Threaded filters are equipped with a rotating mount and locking thumb screw
  • Use with Linear and Circular polarizing sheet material for maximum reduction in glare
  • Filter Surface Quality: 40/20; (PR120: 80/50)

Mount & Size Options

  • Polarizing Filters: Rotating Threaded Mount sizes: M22.5-M105, Slip Mount, Unmounted
  • Polarizing Sheets: Custom cut to fit any lighting, maximum usable width 16.5″

Linear Polarizers

  • Recommended for minimizing glare in any application, passing light through a linear polarizer will also block approximately two-thirds of the incident light.

Circular Polarizers

  • A combination of a linear polarizer and a quarter wave retarder, circular polarizers are recommended for use in systems that employ a mirror or beamsplitter in conjunction with a light metering or auto-focus capability.

Visible Polarizers

  • Visible polarizers decrease glare over the 400-700nm wavelength range.

Near Infrared Polarizers

  • Near-infrared linear polarizers work best over the 700-1100nm wavelength range.