The FotodioX 145mm Circular Polarizer Filter is compatible with the FotodioX WonderPana 145, FreeArc, and Absolute filter holder systems. It helps to reduce reflections as well as 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.

The FotodioX 145mm Circular Polarizer Filter is constructed from optical glass for clarity as well as color fidelity and features lightweight, aluminum-alloy filter rings. A rear filter ring connects to a compatible filter holder while four brass knobs along the side of the front filter ring allow the filter glass to be easily rotated. This provides the ability to achieve the desired degree of polarization even if another filter is placed in front of the FotodioX 145mm Circular Polarizer Filter.

For Rokinon/Samyang 14mm f/2.8    WonderPana FreeArc Core Unit    Use with WonderPana 6.6" Holder Bracket    With Bracket, Holds 6.6" Wide Filters    Holds up to Two 6.6" Wide Filters    Combine a 6.6" Wide and a 145mm Filter    145mm Solid Neutral Density 3.0 Filter    1000x Filter Factor, 10-Stop    145mm Circular Polarizer Filter    Helps to Eliminate Reflections and Glare

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

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.

1.25 to 8x filter factor reduces exposure by 0.3 to 3 stops.

Constructed from optical glass for clarity.

Lightweight, aluminum-alloy filter rings along with four brass side knobs allow the filter glass to be easily rotated. The desired effect can be easily achieved even if another filter is placed directly in front.

Filter pouch included for storage and transport.

Related Questions and Answers

Q: 1. This filter will fit the lens to the Sigma 300-800?

A: The Sigma 300-800m zoom has a 165mm front diameter. The Fotodiox UV filter is only 145mm, so I doubt if this filter will fit the lens in question....

Q: 2. I have the Rokinon 14mm. does the Lee filters work great with this lens?, Does it vignetting too much?

A: I use this adapter with my nikon 14-24mm and have no issues with vignetting. It works well and I'm happy with it. Good luck with your purchase.

Q: 3. Will this work with the AF version of the Rokinon 14mm lens?

A: no, these rings are custom made for each lens.

Q: 4. Can this VND setup be used next to another Rota Tray with just a CP, so I can have both VND and CP? Will this work?

A: The Tiffen Multi Rota Tray Variable Neutral Density Kit with Extra 4x5.65" Circular Polarizer has a rotating ROUND CP that is permanently in the tray, and could be used alone for CP. When combined with one of the included Tiffen 4 x 5.65" Circular Polarizer Filters, which would take up another space in your Matte Box, it becomes a variable ND solution. Tiffen also includes a spare 4x5.65" Circular Polarizer as a backup.

Q: 5. Does this Filter Holder work with Rokinon DSX 14mm EF-Mount cinema lens?

A: No, the FotodioX WonderPana 145 Core Unit Kit for Rokinon/Samyang AF 14mm f/2.8 RF/FE does not fit onto the Rokinon DSX 14mm EF-Mount cinema lens.

Q: 6. Can this be used with this lens Samyang AF 14mm f/2.8 RF Lens for Canon RF ?

A: No, the Samyang AF 14mm f/2.8 Lens for Canon EF cannot work with this Fotodiox accessory.

Q: 7. Can this filter holder work with the Rokinon DSX 14mm cinema lens ?

A: No, the FotodioX WonderPana 145 Core Unit Kit for Rokinon/Samyang AF 14mm f/2.8 RF/FE does not fit the Rokinon DSX 14mm cinema lens.

Q: 8. Does this Tray with both the filters take up only a single slot in the matte box?

A: No, The Tiffen Multi Rota Tray Variable Neutral Density Kit comes with one rotating Circular Polarizer Tray. When combined with one of the included 4x5.65" Circular Polarizer it becomes a Variable ND solution. However, the 4x5.65" Circular Polarizer would take up another space/slot in your Matte Box. A second 4x5.65" Circular Polarizer is included as a backup.

Q: 9. Will this filter work with the original M10 system?

A: The Haida M10-II Drop-In 2-in-1 Circular Polarizer + Neutral Density ND 0.9 Filter (3-Stop) is compatible with the original Haida M10 Filter Holder.

Q: 10. Will this work with the 12 mm Rokinon lens?

A: It's made specifically for the 14mm lens, so no it won't work.