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 Canon TS-E 17mm f/4L    WonderPana 145 Core Unit    145mm Circular Polarizer Filter    1.25 to 8x Filter Factor, +0.3 to 3 Stop    Helps to Eliminate Reflections and Glare    145mm Center-Pinch Snap-On Lens Cap

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. Where would the CPL be located when stacked? Front or back of the circular ND filter? thanks.

A: Most likely I would stack on the outside not the back in order to adjust polarizer

Q: 2. I need to use a clear or haze filter. Is it possible to utilize more than one filter at a time-a polarizer and an ND filter?

A: You cannot stack a uv filter on top of the Slim Circular Polarizer Filter included with the FotodioX WonderPana FreeArc XL Core Unit Kit for Sigma 14-24mm Art Lens with 186mm Slim Circular Polarizer Filter. Fotodiox 186mm filters are not designed with a front threads.

Q: 3. Will this fit the Sigma 14-24 DG N sony e Mount?

A: Yes, if it is the Sigma DG DN Art lens.

Q: 4. 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: 5. Can I use a 77mn variable nd filter with this adaptor? I have tokina 16-18 mm

A: FotodioX WonderPana 145 Core Unit Kit for Tokina 16-28mm Lens is very wide. It accepts 145mm filters. Unfortunately 77mm filters won't work as they are too small.

Q: 6. does it work with the Rokinon 14mm 2.8 series II?

A: No, the FotodioX WonderPana 145 Core Unit for Rokinon/Samyang 14mm Lens with 145mm Circular Polarizer Filter only works with the Rokinon/Samyang 14mm f/2.8 ED AS IF UMC version one and the Rokinon 14mm T3.1 Cine lens.

Q: 7. does the canon version works with the new sony 12-24mm lens?

A: No, it only works with the Canon 11-24mm.

Q: 8. How does this fit the Sigma 12-24mm when the hood doesn't detach? Do I need another accessory?

A: Nothing additional is needed. This fits over the hood. There are a few filter holders on this page. For the Sigma 12-24mm Art Lens make sure to select the holder that is specifically for that lens. BH #FO186EKS1224 • MFR #WNDPN186-ESNTLCP-SM1224F4

Q: 9. does any 145 filter fit on the front of this kit? How does this attach to the lens? I've looked for videos but can't find any. I can see it slides on but what keeps it in place? also if I buy this kit do I need anything besides 145 filters?

A: You will need filter holder # FO66HBWPFA

Q: 10. what is filter thickness?

A: I REALLY DO NOT HAVE A DEMININSION IT IS THE SLIM FILTER THAT IS ALL I CAN TELL YOU.