I just picked up a new Sony GM2 lens that requires 82mm filters, so I’ve been slowly upgrading my filter kit to the right size. The Nano-X series is one of K&F Concept’s higher-end lines, so I was glad to add this one. It fits perfectly on my Sony 24–70 GM II and feels very well made right out of the box.

The ND2–ND32 range works exactly as expected, with very minimal X patterning or artifacts, even toward the higher end of the range. The magnetic adapter ring is a big plus—it stays on the lens and makes swapping filters quick and easy, which is great when shooting video or working fast. Overall, this is solid quality glass for the price, and I’ve had consistently good experiences with K&F products. Easy recommendation if you’re looking for a reliable magnetic variable ND.

✅ Pros
Quick magnetic mounting: Facilitates filter replacement and removal without threads, great for field use.

Variable ND (ND2–ND32): Allows adjustment between 1 and 5 stops of light reduction, ideal for controlling exposure in various conditions.

Good optical quality: Japanese AGC glass with multiple coatings that prevents reflections, preserves colors, and maintains good sharpness.

Slim design: Prevents vignetting in wide-angle lenses, with a lightweight and discreet structure.

Includes magnetic adapter ring: Compatible with standard screw-mount lenses, no need to change the lens.

❌ Cons
Limited range (ND2–ND32): Does not cover extremely long exposures like ND64 or ND1000, which limits creative use in certain situations.

Slight risk of vignetting in very wide lenses: Despite being thin, it can cause vignetting at 16mm or less depending on the lens.

Not recommended for rolling shutter sensors in video: Like all variable ND sensors, it can cause artifacts in fast motion depending on the camera.

Final Verdict
The K&F Concept Nano-X ND2–ND32 magnetic sensor is an excellent option for photographers and videographers looking for practicality without compromising image quality. Ideal for travel and outdoor shoots, it offers a great balance between convenience, performance, and price. For those who don't need extremely long exposures, it's a versatile and effective ally.

so let me start off with this, i dont usually write review about lens filter because most of them are just good and ive never had problem with any of them since my canon 60D era.lol but recently ive got a little issue with one of my main filters that i only used a few times so far since its only being used on one of my main lenses to shoot weddings and enggagements only. one morning when i took it out of my camera case then attached it to my A7siii to get them ready for a shoot, after some inspection, i found micro scratches right in the middle of the filter! i was shocked and little bit annoyed, because it never been dropped, rubbed against anything! so i emailed the company an hour later and got a response later on that day. after emailing back and forth including sending them pictures, the very next day they said they will send me a replacement and would be here on monday! it was so easy to work with them although im glad i had spare filters incase of emergency situation like this happens. it might have been one in a million deffect from their factory but it surely didnt scare me enough to stop buying their products in general!

ps: the scratches seemed doesnt affect or degraded the picture quality at all, but i wouldnt use it for professional shoots anymore.

One of my greatest concerns when purchasing this filter was its wide focal lens performance, which I can understand is challenging due to light physics.

After testing on my Sony PZ16-35 lens:
- At 16mm focal length vignetting is not usable and needs to be cropped.
- At 17mm it is very light and hard to notice, very usable to me.
- At 18mm I can't see it at all and looks great.

I uploaded 5 images to this review (pardon the high ISO, as I tested the filter at ND32). Focal lens of each pic: 16mm, 17mm, 18mm, 19mm, 20mm.

I am keeping this filter because I don't think I'll be able to find a filter that accomplishes no vignetting at 16, but I wish companies were more upfront about which exact focal lens their filters support well.

I come with a long history of taking photographs with filters for special effects. I have used Cokin systems where you can share one filter with various lenses with adapters. I own over 50 such filters and lately, I am simplifying my camera bag and traveling with only a few filters. My most popular filters are the graduated neutral density (ND) filters. With these, I can rotate the filter to my preference on each shot. BUT that means I have to carry more than a few of the same ND filter but at different stops.

Solution: The K&F Concept Magnetic Variable ND Filter offers me an option to use one filter covering 5 stops within seconds. That is great timesaver as my shots of landscapes or sunsets sometimes requires swift framing and adjusting to rapid light changes.

ND filters are an investment to your camera gear. These will filter out very bright light and allows the photographer longer exposures during daylight. My favorite use of ND filters is to have water movements look silky while capturing the surrounding in detail. This K&F Concept filter is built amazingly well. The glass is better than my Cokins. Since it is built to specific lens size diameters, I had to rationalize which lens I used the most and ordered that size. 58mm in this case.

The case is a worthy vault for this filter. Kudos to the team that designed that feature. The magnetic ring screwed nicely into my existing lens. In fact, it screwed in too tightly, it took me 10 long minutes trying to unscrew it later on.

The magic is with the magnetic technology. Wow! It was instant on and instant off for the actual ND filter. Amazing. With that also comes the fear of dropping the filter. I fear that a bump will dislodge it so I kept my hand on the lens at all time. If you are in stationary setting, you should be fine.

This lens filter is a great tool for many future vacation shoots. Simple to carry and use.

Do note you cannot place a regular lens cap over the ND filter. Bummer.

Overall, I love the new direction that these ND Filters are headed. It is less fuss and more time spent on the actual shooting pictures. Give this a try. I do recommend this variable ND filter.

This is one of the best additions to our camera since we got it. It is very easy to install and once in it stays put due to the alignment slots on the back side.
Adjusting it is very easy once it snaps in. We like the infinite variability, it allows you to perfectly tweak your settings for each scene.

Feels like a premium piece of gear right out of the box. The build quality is solid, and the magnetic attachment system makes it snap into place securely without any wobble.

I use this mainly for super bright days when I need to keep highlights from getting blown out, but it would be great for a bunch of other shooting conditions too. I like the way the adjustment ring turns smoothly with not much resistance and that the markings are easy to read. Also, the textured edge gives me a good grip when rotating the filter, which I noticed one day when I was shooting outside and my hands were really cold, so it was a big help.

Optically, it performs very well. I didn’t notice any obvious color shift, and it keeps my images super sharp. The multi-layer coatings seem effective—reflections are minimal, and the glass is crisp and clear.

I'm really happy with this filter! Its well-designed, thoughtfully built and makes controlling exposure fast and convenient. Highly recommended for video and photography work.

A magnetic variable ND is one of those tools that immediately speeds up your workflow—especially when you’re moving between sun, shade, and interiors and want to keep shutter speed consistent for video. This K&F CONCEPT Nano-X set includes an 82mm ND2–ND32 (1–5 stops) variable ND plus a basic magnetic ring, so once the ring is installed, the filter snaps on and off quickly instead of slowly threading every time.

In a typical production setup, the 1–5 stop range is a practical sweet spot for everyday daylight control. The magnetic system is the real quality-of-life upgrade here: you can pop the ND off for a quick indoor moment, then snap it back on without breaking pace. The multi-layer coatings and water-resistant/scratch-resistant build are also helpful for real-world shooting—fingerprints, dust, and light moisture happen, and this kind of coating generally makes cleaning less stressful.

Pros
• Magnetic swap is genuinely fast once the ring is installed, which helps in run-and-gun shooting
• 1–5 stop range is versatile for daylight control while keeping creative settings consistent
• Coatings help with cleaning and reduce surface reflections in harsher light
• Solid build feel for a filter that’s likely to live on a lens during outdoor shoots

Cons
• Requires keeping the magnetic ring on the lens, which may affect how some caps/hoods fit depending on your setup
• If you frequently switch lenses, you may want extra rings to keep the magnetic workflow consistent
• As with any variable ND, results can vary slightly at the extremes depending on lens and shooting conditions (worth keeping in mind)

Final Thoughts
If your priority is functionality—fast, repeatable exposure control—this kit delivers a noticeable quality-of-life improvement, and the coatings help protect image quality in real shooting conditions. It’s a strong fit for creators using 82mm lenses who want a quick-swap solution that keeps color accuracy looking natural and makes day-to-day shooting more efficient. As a practical, reusable tool that speeds up work in the field, it offers solid value.

Overall, I’ve love using this ND filter for my camera lenses. I’m excited to share my thoughts on it.

The packaging is nice, and I trust this brand because I’ve bought from K&F before. I remember purchasing an ND filter from them a long time ago, and the quality was great even then. You’ll find this filter in a branded translucent box. It’s very nice, and the box itself keeps the ND filter safe and clean for traveling.

I’ve had issues with other ND filters where the higher ND you go, the X pattern shows on your image. This one doesn’t have that problem. They actually promised on the filter that they improved on that aspect. I can confidently say that this one doesn’t have the X pattern like the others and the filters I’ve tried in the past.

The quality of this filter is also good. It’s well-built and I believe it’s made of steel. I also love how this filter is magnetic. You can preinstall the magnetic ring around your lens’s diameter ring, and whenever you need to use the filter, you can just snap it on instead of twisting it on. I’ve found this very convenient because not every shot requires ND.

The color accuracy is mostly accurate. I do notice a slight tint shift towards the warmer/green side of the color spectrum. You can compensate with some tint adjustment directly in camera or in post-production, but overall, I don’t think it’s a major problem.

This filter has very good functionality because of the magnetic feature. It’s super convenient for me, and the magnets themselves are pretty strong. I wouldn’t use this magnetic filter for heavy action shots because I feel like it might fall off in those situations. However, it works very well for typical practical uses and fits the 82 mm diameter perfectly.

Overall, I highly recommend this ND filter for anyone looking for one in this price range and with many corrections compared to other filters like the X pattern I mentioned earlier. This one is perfect for me and will be used on many higher-end and production shoots. Great value for the money!

I’ve finally moved away from standard screw-on filters. The magnetic swap on this K&F Concept VND is a total game-changer for my workflow. I can literally snap it on and off in a second. This is a life-saver when I'm out in the field and the light is changing fast. The quality is top-tier. The Japanese AGC glass feels premium. The 28-layer coating has already proven its worth by being super easy to clean after a misty morning shoot.

The look and feel of the filter are very professional. It has an ultra-slim 7.4mm frame that doesn't cause any vignetting on my wider lenses. The CNC-machined pattern on the edges gives it a great grip. I’m a huge fan of the protruding adjustment tab. It makes it much easier to dial in the exact exposure I want without having to hunt for the edge of the filter while I'm looking through the viewfinder.

Most importantly, the photo quality is outstanding. I haven't noticed any weird color shifts. The hard stops at ND2 and ND32 are brilliant because they completely prevent that annoying X cross pattern that usually ruins variable ND shots. For the price, the value for money is insane. It performs just as well as my high-end filters that cost twice as much. It’s a rugged and reliable piece of gear that has quickly become a permanent part of my kit.