This K&F Concept Nano-X HD Polarizer Filter 49mmfrom K&F Concept Nano-X HD Polarizer Filter 49mmis 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. WILL THIS FILTER WORK ON A LEICA 28MM-70MM R LENS?

A: Yes the B+W High-Transmission MRC-Nano Master Circular Polarizer Filter (60mm) should fit the Leica 28-70mm f/3.5-4.5 Vario-Elmar-R lens

Q: 2. 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: 3. 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: 4. This seems to be recommended for Leica Q2. Will it work with the lens hood in place?

A: Yes the B+W 49mm filter can be used with the hood that comes with the Leica Q2 camera.

Q: 5. 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: 6. What is the Filter factor?

A: The B+W High-Transmission MRC-Nano Master Circular Polarizer has a filter factor of 1-1.5 stops.

Q: 7. Is this filter magnetic?

A: No, the K&F Concept Nano-X Series CPL Filter (49mm) is not magnetic.

Q: 8. What is the filter factor of this filter? One stop or more?

A: B+W does not publicly publish this information in any of their data sheets, but independent testing yielded a loss of approximately 1.5-stops of light when using the B+W high-transmission MRC-Nano Master CPLs.

Q: 9. 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: 10. What lens cap will fit this 77mm filter?

A: You may use any 77mm lens cap. Here are some examples https://www.bhphotovideo.com/c/product/806450-REG/Sensei_lc77_77mm_Center_Pinch_Snap_On.html or https://www.bhphotovideo.com/c/product/850508-REG/Sony_ALC_F77S_ALC_F77S_77mm_Front_Lens.html