This 3- to 7-stop, 49mm K&F Concept Nano-X Magnetic ND Filter 49mm 3-7 Stopfrom K&F Concept allows you to quickly install the filter adapter ring on the lens thanks to its magnetic properties. The filter utilizes cutting-edge technology to avoid the common "X" cross on a wide-angle and telephoto lens. Both sides of the glass have nano-coating layers that make it waterproof, scratch resistant, and glare resistant, effectively protecting the camera lens.

Variable 0.9 to 2.1 Optical Density    28-Layers of Nano-Coating    1-Second-Swap Magnetic Filter    Avoids Common "X" Cross    Waterproof and Dustproof

This variable ND8-ND128 filter with magnetic technology can be installed in seconds for a faster installation than traditional thread filters.

The adapter ring has a thread to be screwed onto the lens. The ND8-ND128 magnetic filter engages in a magnetic way. Magnetic adapter rings are also suitable for other magnetic filters such as the magnetic CPL, magnetic ND8, magnetic black mist, and the magnetic ND1000 by K&F Concept.

K&F Concept utilizes cutting-edge technology (frame self-lock) to avoid the common "X" cross on a wide-angle and telephoto lens.

Both sides of the glass have nanometer coating (a total of 28 layers) that makes it waterproof, scratch resistant, and anti-glaring, effectively protecting the camera lens.

Related Questions and Answers

Q: 1. Will it fit inside of the Canon 200mm f/2?

A: If your camera lens has a diameter of 52mm, then it should fit....The lens mm diameter is compatible with any filter with the same mm diameter it claims to have. Hope this helps!

Q: 2. Hi i plan to use this filter on Nikon 28mm f/1.8G AF-S Nikkor mount on Nikon D700. Any concern?This is an expensive filter so just want to be sure before purchase.Thanks!

A: They are 100% compatible and will work well together.

Q: 3. Does the ring physically stop at min and max ends, or does it just spin all the way around?

A: Yes! Hard stops on both ends. Great feature.

Q: 4. Will this filter cause vignetting on the Canon RF 35/1.8 (using a Canon RP body)?

A: This filter would be specific to wide angle lenses, so it would not vignette on a lens like the Canon RF 35mm f/1.8.

Q: 5. Can I use this on my Nikon wide-angle lens 10-24mm without vignette?

A: Most likely, no. The rim on this filter being the variable midel, is much wider than a standard ND would be. You definitely need to find a fixed stop ND for a wide angle. Even with that, you may still have slight vignetting at the 10mm end.

Q: 6. Can screw on filters be stacked on top of the Nano 810 filter?

A: No you can not stack filters on top of this one. I would suggest that this be the last filter of the stack.

Q: 7. Will this filter fit into a tiffen 4x4 holder?

A: This filter is a 2mm filter. The Tiffen works with 4mm filters. This filter would be at risk of falling out.

Q: 8. Can someone explain the markings on the filter? Thanks

A: The markings are 1/2 stop increments. This helps you determine the proper exposure.

Q: 9. I have a Sony A7S with Sony FE PZ 28-135mm f/4 G OSS Lens and shoot video. I like the flexibility of the variable ND filter especially as I often don't have time to change filters. Is this the best for exteriors?Thanks Andrew

A: It's that or a mattbox with ND, especially for shooting Log2 or Log3 at 1600 or 3200iso.

Q: 10. Does this filter cause that dreaded hourglass darkening when set at 1.5? I have one that if I get past 1/2 the settings, it gets a distorted discoloration. Thanks

A: I have taken a series of exposures at each stop...bright light, but needed long exposure. I didn't see any hourglass effect.