This Nano-X HD Green Multi-Coated Waterproof Circular Polarizer Filter from K&F Concept is a 49mm multi-coated glass circular polarizing filter that helps reduce reflections and glare by filtering out light that has become polarized due to reflection from a nonmetallic surface. The light from the sun 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 directionally polarized light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from nonmetallic surfaces and an increase in the saturation of skies and foliage.

This filter is constructed from German Schott B270 optical glass for clarity as well as color fidelity, and it features green multi-coating to prevent internal ghosting and reflections. In addition, each surface features resistance coating to prevent minor abrasions, repel water droplets, and resist smudging from grease and oil. It is made with an aluminum alloy filter ring that can be rotated to adjust the intensity of the polarization effect.

Circular Polarizer Filter    Helps Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Multi-Coating and Resistance Coating    Schott B270 Optical Glass    Aluminum Frame

Related Questions and Answers

Q: 1. Can I put it on a sigma 30 mm lens?

A: In theory you could with a step down ring, but you'll get vignetting on the edges. I'd recommend getting the correct 52mm filter.

Q: 2. Why the green coating on the filter?

A: It aids in the reduction of glare that the filter could encounter according to K&F.

Q: 3. Seems thick. Will it vignette? Depending on lens I suppose. Also, will it interfere with lens hood?

A: If your lens is wider than 24mm (full frame), then yes it will probably vignette. It would most likely interfere with the hood.

Q: 4. I have a Canon 24-105mm f4L(77mm). I already have a 77mm protective filter on it; with threads, so I can stack another filter. What size ND filter should I order?

A: Protective filters have the same size front and rear threads so a 77mm variable ND would be recommended.

Q: 5. Will it fit Sigma 16mm F1.4 DC DN EF-M?

A: Yes, as the Sigma 16mm f/1.4 DC DN Contemporary Lens has 67mm filter threads on the front of the lens, the K&F Concept Nano-X Variable Fader NDX HD Green-Coated Waterproof Anti-Scratch Japan Optics Filter (67mm, ND2-32) is compatible for use with the Sigma 16mm f/1.4 DC DN Contemporary Lens.

Q: 6. Is this actuality German Schott glass used in this filter? Some make statements that it is not.

A: Yes, the K&F Concept Green Multi-Coated Schott B270 German Optics Slim UV Filter, is made of German Schott B270 optical glass.

Q: 7. Is the front side of this filter threaded for mounting another another filter?

A: K&F Concept Green Multi-Coated Schott B270 German Optics Slim UV Filter (86mm) front threaded are not for mounting other filters, if you need to put different filters in one lens you can consider K&F Concept Magnetic Filter Kit or Square Filter Holder Approv

Q: 8. Does this come with a plastic case or only the pouch that's pictured?

A: Unit comes in a filter storage pouch and is packaged in a black cardboard case.

Q: 9. Can you turn the polorizer the entire way off on this filter?

A: The polarizing effect on the K&F Concept Nano-X ND2-32 Variable Fader & Circular Polarizer HD Green Coated Waterproof Anti-Scratch Japan Optics Filter (77mm) can be reduced, but not turned off.

Q: 10. Will this allow for a lens cap?

A: Yes, this B+W High-Transmission MRC-Nano Master Circular Polarizer Filter (82mm) has front threads to allow for the use of a lens cap.