The Schneider 5x5" Circular Polarizer Filterfrom Schneider 5x5" Circular Polarizer Filterhelps 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 circular polarizer only differs from a linear polarizer in that it contains a quarter wave plane in addition to the linear polarizing filter. The addition of this quarter wave plane is to circularly polarize the 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, 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 non-coated and delivers approximately 38% average light transmission. Constructed from Water White optical glass, this 5 x 5" filter is unmounted for use in third-party or custom filter holders.

Unmounted Circular Polarizer Filter    For Third-Party or Custom Holders    2x Filter Factor, +1 Stop    Helps to Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Non-Coated    Water White Optical Glass    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.

Circular polarizers are ideal for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features.

Constructed from Water White optical glass.

Non-coated.

Approximately 38% average light transmission.

2x filter factor reduces exposure by 1 stop.

Filter Pouch for storage and transport.

Related Questions and Answers

Q: 1. How many stops of light do we lose by using this polarizer?

A: I contacted Sony concerning your inquiry. While they did not have an exact light loss listed for this Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens, they did state that circular polarizers typically block out half of light coming in, so typically light loss is 1-2 stops.

Q: 2. Does this Polarizer lens fit in a Nikkor 500mm f4 lens?

A: The Nikon 52mm Circular Polarizer (C-PL3L) Glass Filter - Drop-In is not compatible with the Nikon AF-S NIKKOR 500mm f/4E FL ED VR Lens, which uses a 40.5mm drop-in CPL filter.

Q: 3. does this filter come with any type of storage case?

A: Yes, this filter does include a storage case.

Q: 4. Is the filter adjustment ring water resistant? Seems like a place that could potentially let in water into the lens during rain.

A: I am not sure but its a direct replacement for the filter that comes with the lens. I use a Thinktank cover any time Im shooting where the lens could get wet.

Q: 5. Can the actual circular filter be removed and replaced with another filter ?

A: No, the filter in the Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens cannot be removed and replaced.

Q: 6. Can this filter be used with Nikkor 180-400mm f/4?

A: Yes, this can be used with the AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR lens.

Q: 7. Will this filter fit the Sony (or Minolta) A-Mount 500mm F/8 reflex lens?

A: No, this Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens is not compatible with the Sony A 500mm f/8 Reflex Lens.

Q: 8. Does this fit in the new 300mm f2.8 Sony lens?

A: Yes, the Sony Drop-In Circular Polarizing Filter for Sony FE 400mm f/2.8 GM OSS Lens is also compatible with the Sony FE 300mm f/2.8 GM OSS Lens (Sony E).

Q: 9. How do I rotate the Nikon C-PL 460 Slip-In Circular Polarizer? to adjust to get rid of glare?

A: The Nikon C-PL460 Slip-In Circular Polarizer has a dial/gear on the top that rotates the filter.

Q: 10. I have both a 200mm and 800mm Nikon lense that use the same drop-in 52mm Circular Polarizer Glass Filter. For $200 the filter should come with a practical case in which to store the clear glass filter, which must be temporally removed from the lens. The large plastic case the C-PL3L Polarizer comes in is nothing but a fragile shipping case. What can you recommend as a compact durable protective case?

A: This is the type I used for years on movie sets. B+W E1 Filter Pouch - Holds 1 B+W Filter up to 77mm B&H # BWFP77 . Here is one that is very soft. OP/TECH USA Soft Photo/Electronics Wide Body Pouch, Small (Black) B&H # OPPPWBSB. This one will hold three filters. Sensei Three Pocket Filter Pouch (Up to 77mm) B&H # SEFP3P77B. None of these I like that much because they do not completely seal. So I also suggest these Porta Brace bags. They may be too big but they zipper close unlike the others that allow dust in. Porta Brace Filter Pouch Set for up to 3 Circular Filters up to 4.5" B&H # POFILTERPOCH