My set of Mavic 3 Classic ND filters attaches easily and comes with a neat protective case. Testing the ND64 filter I got a noticeable 1000K Cool/ 2% Green tint color cast, but the spectrum transmission is smooth so it can easily be corrected in post. The sharpness is good. Overall happy with the filters, especially for the price.

I'm super confident with this Mavic 3 filter, it's cheap and it feels high quality too. The box in which the filters are stored feels very good and of high quality.

The K&F Concept ND filter set is rated in ND 8, 16, 32 and 64 for DJI Mavic 3 Classic.

The filters come in a small plastic storage case. Inside are the 4 filters, embedded in a foam rubber mold. Thanks to the foam rubber, they remain reliably in place and are well protected from scratches.

The filters themselves consist of a metal frame and tempered optical glass.
They are included in 4 different strength classes. For most purposes, the filters should be sufficient to be able to increase the shutter speed of the drone as desired, thus creating a cinematic motion blur in the image. Or simply to be able to correctly expose the image.

The filters have a very good workmanship. They fit the drone's lens with millimeter precision. The closure of the filter holder snaps gently into place. The filters can also be easily turned down again.
I really like that the filters are made of metal. In addition, one weighs just 8g, which does not change the flight characteristics of the drone.

The compensation is excellent, the filter has no color cast.

Conclusion
In my opinion, the K&F Concept ND filter set is a very good product. The filters are cleanly processed + the set is thoughtfully put together. Long exposures with ND256 or higher filters will not be done from the air anyway, so I think the ND 64 is the all-purpose weapon for very bright environments or very long shutter speeds for motion blur.
At the time of my review, the price of the filter set was around EUR 50, which in my opinion represents an excellent price/performance ratio.
So I'm giving it 5 stars and I hope my review was helpful.

I expected a lot from these because they are from KF. I use their VNDs for all my mirrorless camera gear. So I took these filters to my partner who owns the DJI Mavic 3/Mavic 3 Cine. Unfortunately I couldn't get the footage from him as we were shooting for a paid client but I can say the quality was amazing! I didn't even know there were variable NTDs for drones! It makes life so much easier. As we flew around we started to get some cloud cover. So we just landed and instead of having to remove the filter and add one with a lower ND strength, we just rotated the filter slightly and flew back up in less than 5 seconds. That's huge, because at a customer shoot, where it was a real estate shoot, you have very limited time to get your shots, often less than an hour total. So every second I can save is important. I can only recommend these filters!

I had actually used the Neewer ND filters for my DJI drones and GoPro for years and was always satisfied with them. Now I have also received this one from K&F for my new Mavic to test. Delivery was quick thanks to Amazon.

The filters fit the Mavic 3, which is also available from Neewer. There is not much difference in price between the two sets. K&F are a few euros cheaper, but also offer quasi-integrated polarization filters. The filters are all top-quality and sit firmly on the camera body. Even with a lot of action and turbulent scenes, there is no need to worry. The filters remain reliably in place.

With the ND filters, the exposure time in bright sunlight is extended and the pictures simply look much better than without them. There are some good apps that recommend certain ND filters depending on location, time of year and position of the sun/time. Lens flares in backlit shots are also largely suppressed, which Neewer also does well.

The lenses are easy to clean and a case is included for transport. I can only recommend. If you are looking for ND filters and do not need the polarization settings, you can also use Neewer. Neewer is occasionally on sale, unfortunately I don't know about K&F yet. Because they are new to me.

Since I didn't have any filters when I bought a Mavic 3 Classic, I turned to these K&F Concept filters.
I tested them during a performance with a good rendering, the fog is very present and gives a good stamp of approval to the image in post-production.

I bought the same ones for the Air 2S, unsurprisingly the same look.

In any case, do not use filters when taking photos with your drone. Only wear them when you are making videos.

The ND filters for the DJI Mavic 3 Classic drone of excellent workmanship, very easy to install and use and with excellent packaging.
I use it with my drone and the difference is remarkable. It eliminates digital over-sharpening, reduces contrast and allows you to reduce shutter speed. good investment

I'm pretty impressed with these ND filters. First off, the build quality is pretty good...metal frame and glass construction, as opposed to the cheaper plastic versions (that I've had before). The picture quality is great in my opinion. Check out the short video for yourself. Shot on Mavic Mini (original) with ND32 filter 1080p at 30 fps and ISO 100. I also have another brand (Freewell) of ND filters for my Mavic Air 2 and I find that they work just as well as this one (obviously different drones... but compared to image quality) and are a bit cheaper. These install easily and stay on securely. I would definitely recommend these.