The Schneider 138mm True-Pol Linear Polarizer Filterhelps 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 auto focus and exposure functions. Due to how the light is broken down and filtered with a linear polarizer, in-camera auto focus 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 and delivers approximately 33% average light transmission. Constructed from Water White optical glass, it is 138mm in diameter and unmounted for use in third-party or custom filter holders.

Unmounted Linear Polarizer Filter    For Third-Party or Custom Holders    2.97x Filter Factor, +1.57 Stops    Helps to Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Non-Coated    Water White Optical Glass    138mm Diameter    Filter Pouch

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

Unmounted 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.

Approximately 33% average light transmission.

2.97x filter factor reduces exposure by 1.57 stops.

Constructed from Water White optical glass.

Filter Pouch for storage and transport.

Related Questions and Answers

Q: 1. I am looking to mount this into a rotatable tray for a matte box tray. Is the diameter of this unmounted filter exactly 4.5"? It seems the stated diameter of the mounted variety is also 4.5"

A: Schneider lists on their site that the Schneider 4.5" Unmounted Circular True-Polarizing Water White Glass Filter BH #SCCPU4.5 • MFR #68-019902 is 4.5".

Q: 2. Aside from the polarizing, what amount of ND does this amount to?

A: Schneider 4 x 5.65" Linear True-Pol Polarizing Filter ranges from 1.2 to 1.5 stops of density depending on the amount of polarization.

Q: 3. Will this fit with the Bright Tangerine ONE tray?

A: The Schneider 138mm Unmounted True-Pol Linear Polarizer Filter will fit in the Bright Tangerine ONE Tray for Misfit Kick or ARRI LMB Matte Box.

Q: 4. Will this work with the Bright Tangerine Misfit Atom Pola+ Matte Box?

A: Yes it will.

Q: 5. Will this work with the ARRI K2.66128.0 F4 Filter Frame (for ARRI MMB 2)?

A: No, the Schneider 138mm Circular True-Polarizing Water White Glass Filter (B&H# SCCP138) is a 138mm (5.43") diameter filter whereas the ARRI Filter Frame Combo 4 x 4"/4.5" Round (B&H# ARK2.66128.0) (which you are referring to by its manufacturer model number of K2.66128.0) only accepts certain filters up to 4.5" in size.

Q: 6. Is this filter actually 100 X 100 (listed in specs), or is it the standard 101.6 x 101.6?

A: The filter is 101.6 x 101.6

Q: 7. What's the difference between the Linear and Circular versions of 4 x 5.65 please? Do they both require a matte box with a rotating filter tray?

A: Here Linear and Circular refer to the type of Polarizing film in the filter. The confusing Circular term actually has nothing to do with the shape of the filter. It can be round or rectangular, it does not matter. A Linear Polarizer is be used in cameras without auto focus or auto exposure. A Circular Polarizer is to be use in today's digital cameras with their auto focus and auto exposure. You will need a filter holder/matte box with a rotating 4 x 5.56 to use this size Polarizer. However, we recommend that instead of a rectangular Polarizer filter, using a round one for it is much more practical, i.e., easier to use.

Q: 8. Can you confirm the threading on this filter?Is it 138mm diameter with 1mm pitch?How deep is the overall thread?What is the overall thickness of the filter? (or more importantly the thickness excluding the rear thread)Unfortunately the manufacturer lists very minimal information on their website and I can't find any detailed pictures to deduce the important dimensions from.

A: It is a 138 mm diameter but there are no threads on this filter. I use it in the rear dounut of a matte box.

Q: 9. Would this work well with the Tilta Mini Matte Box? Also would you recommend the linear or circular for a Sony FX30 camera?

A: Yes, the Schneider 4 x 5.65" Linear True-Pol Polarizing Filter would work perfectly with the Tilta Tiltaing Mini Matte Box. Also, here are a few screw on filter options for Sony FX30 lenses. PolarPro 82mm QuartzLine Circular Polarizer Filter BH #POCP82Q B+W High-Transmission MRC-Nano Master Circular Polarizer Filter (82mm) BH #BWCPHTM82

Q: 10. Will this fit into revar cine rota pola tray?

A: Yes ,that is the reason I purchased it. Works Great.