The NiSi 138mm Mounted Linear Polarizer Filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges, and filters, this directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces and an increase in the saturation of skies and foliage.

A linear polarizer differs from a circular polarizer in that it does not contain an additional quarter wave plane. The addition of a quarter wave plane is to circularly polarize linearly polarized light for the use of autofocus and exposure functions. Due to how the light is broken down and filtered with a linear polarizer, in-camera autofocus and exposure accuracy become skewed during use. When the light becomes circularly polarized, it permits the use of these functions.

This filter is recommended when not using in-camera exposure metering or autofocus. It is non-coated, constructed from water white glass for optical clarity as well as color fidelity, is 138mm in diameter, and is mounted for use in third-party or custom filter holders. No front or rear threads are included on this filter's ring or mount.

Mounted Linear Polarizer Filter    For Third-Party or Custom Holders    2.0-2.8x Filter Factor, +1.0-1.5 Stops    Helps to Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Non-Coated    Water White Optical Glass    138mm Diameter    Leatherette Pouch

Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.

Mounted without front or rear threads for use in third-party or custom filter holders for film and television cameras.

Polarizing filters arrange, and filter, directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light.

Clears up haze in distant landscapes and provides more saturated, vivid colors.

Strongest effect when used at a 90° angle from the sun.

Recommended when not using in-camera exposure metering or autofocus.

Non-coated.

2 to 2.8x filter factor reduces exposure by 1 to 1.5 stops.

Constructed from water white glass for optical clarity as well as color fidelity.

Leatherette pouch included for storage and transport.

Related Questions and Answers

Q: 1. How thick is this filter?

A: it is about 6-7 mm thick

Q: 2. What is the origin of the glass in the filter?

A: Unfortunately Nisi does not specify the type of glass used in the Pro Circular Polarizer Filter.

Q: 3. Are the metal rings made of brass or aluminium? Product overview sections mentioned as brass and aluminium in specifications.

A: The NiSi Pro Circular Polarizer Filter has brass filter rings. Not aluminum.

Q: 4. Can i stack a NISI ND Filter to this polarizer?

A: No problem!

Q: 5. Will this fit the Tilta MB-T12 matte box?

A: Yes it will

Q: 6. How many slots does this filter take? Does this also have a cool/warm fx when facing towards camera?

A: This has 1 slot with no color shift.

Q: 7. Can this be used with a Tamron 15-30mm f/2.8 filter holder system?

A: This will not mount to the NiSi Tamron 15-30mm holder or any other holder for that lens that we are aware of.

Q: 8. Is this a dual ring filter where you can turn the filter and make sure the lines of polarization are horizontal?

A: Yes. The NiSi 95mm Pro Circular Polarizer Filter has 2 rings. One rotates to change the polarization in the scene.

Q: 9. What's the filter thickness?

A: It is about 6-7mm thick.

Q: 10. Difficult to compare without actual purchase. Ex, compared to Formatt Hitech 67mm Firecrest SuperSlim Circular Polarizer Filter.....(for 67mm variant)....which has a thinner metal ring thickness? Which has a higher light transmission?

A: The Formatt Hitech would be a slightly thinner filter, but the NiSi would have higher light transmission.