For ND filters (without gradient) the concept seems very conclusive to me. Incidentally, the additional ring can also be used to attach another lens to the magnetic connection. The magnetic force seems strong enough to me, it's actually not that easy to remove the filter without shaking the camera. You definitely don't have to be afraid that the filter will fall off at the most inopportune moment. The image quality does not suffer visibly from the filter, as far as I was able to judge tonight. Because dusk was already setting in, I was only able to achieve the same brightness relatively soon with an increased ISO (no tripod with me...), which of course led to losses, but these have nothing to do with the glass as such. the first pictures, that could still be shot with different exposure times did not show any significant losses even in the 100% view. However, there is a slight discoloration of the image, which turns purple with the filter. (Supplement a day later: in daylight and light snow, the picture with the filter was harmoniously balanced overall (trick: no strong contrasts...) and therefore significantly "warmer" than without the filter)

The K&F Concept Magnetic 62mm Lens ND Filters Kit (5 Pack) GND8+ND8+ND64+ND1000 + Magnetic Filter Adapter Ring Filters Set with 28 Multi-Coated for Camera Lens:

This is an outstanding ND filter kit. The filters themselves are very good ND filters with no color shift. I have been using several K&F Concept filters lately and I find them to be among some of the best I’ve ever used. Overall very well engineered and constructed. This kit comes with 3 levels of neutral density and 1 graduated ND. The filters attach magnetically to a screw in ring, making swapping them out quick and easy. The magnetic ring is pre attached to one of the filters when the kit arrives, and you will use that one ring for all 4 filters. I really love the addition of the gradient ND as landscapes are one of my passions and this filter is ideal for bringing drama out of the sky. The kit also comes in a very nice filter wallet with several ways to attach it to your bag, belt, tripod etc. This is such a nice touch, and it really is a nice wallet, not just a cheap holder. I highly recommend this kit if you are looking for high quality ND filters. If you love to shoot very shallow and wide open, these are a must have. Solid color rendition, well designed and well made, high end filters.

The K&F Concept Magnetic 62mm Lens ND Filters Kit (5 Pack) GND8+ND8+ND64+ND1000 + Magnetic Filter Adapter Ring Filters Set with 28 Multi-Coated for Camera Lens:

This is an outstanding ND filter kit. The filters themselves are very good ND filters with no color shift. I have been using several K&F Concept filters lately and I find them to be among some of the best I’ve ever used. Overall very well engineered and constructed. This kit comes with 3 levels of neutral density and 1 graduated ND. The filters attach magnetically to a screw in ring, making swapping them out quick and easy. The magnetic ring is pre attached to one of the filters when the kit arrives, and you will use that one ring for all 4 filters. I really love the addition of the gradient ND as landscapes are one of my passions and this filter is ideal for bringing drama out of the sky. The kit also comes in a very nice filter wallet with several ways to attach it to your bag, belt, tripod etc. This is such a nice touch, and it really is a nice wallet, not just a cheap holder. I highly recommend this kit if you are looking for high quality ND filters. If you love to shoot very shallow and wide open, these are a must have. Solid color rendition, well designed and well made, high end filters.

I love using filters, the polarizing filter in forests or on the coast I find it essential, also when there is hard light, when there are low moving clouds and in rivers, waterfalls and coasts I love using the ND filter. In situations where I don't require the polarizing filter or ND filter, I like to use Ultraviolet to protect the lens.

The truth is that sometimes it is cumbersome to use them, especially in adverse situations when, for example, it is cold and you are wearing gloves, there is a lot of wind, you are very close to a waterfall and there is spray, etc, etc. It has also happened to me on occasion that I have left the filter on the lens for a while and then it has been difficult for me to remove it, so I have found it interesting to try the magnetic K&F filters, it seems to me a comfortable system with a good quality / price.

In the package comes a case with the 3 filters (a polarizer, a 10-stop ND and UV) and a screw adapter, the case can be placed on the belt to always have the filters at hand.
The use is quite easy, you simply have to place the thread adapter and place the filter in it, as it is magnetic it immediately catches it and from there it does not move, if I want to change the filter it is as simple as removing it and putting it on, you can see the video where I record the simple process.

The good thing about this system is that both the adapter and the filters are thin and you can also place two filters at the same time, for example the polarizer and the ND to take out moving clouds with polarized light avoiding unnecessary reflections.

In short, I have loved the system of changing the filters so quickly, when I am traveling or in uncomfortable situations I will appreciate it.

As a photographer, I use filters, but it's not always easy to put on or take off depending on the situation. But with this system, it becomes so simple that it's almost instantaneous. The product is of very good construction quality and it comes with a 4-pocket pouch that is very well made and resistant against possible knocks. It can be attached to the belt with a Velcro. The kit is composed of two screw rings, one UV and one vacuum on which the CPL filter or the ND1000 can be fixed. I really wanted to go and test this new product. First with the CPL filter alone and then with the CPL filter + the ND1000 together. The results are just astounding. Here are the renderings with the CPL filter on the left and the CPL + ND 1000 on the right. With the filters it does there is no loss of sharpness, and color drift is almost nil. The CPL filter polarizes perfectly and the ND 1000 filter is very surprising in terms of its performance, it is very thin which limits vignetting, a plus. By using the two together, it is better to avoid ultra wide-angle focal lengths, but from 16mm, no worries, you can add them. In addition, they are compatible with my sun visor, I was able to put them on and take them off without having to take them off very easily because the magnetic force is perfectly dosed. Really very satisfied with this first outing, I hope others Intermediate magnetic filters with this system will be released soon to complete the offer. If there were magnetic lens caps, that would be great.

Nothing bad to say, magnetic filters are always easier, but this particular ND gets the job done in all other aspects. These ND filters are truly colourfast, you won't be disappointed.

I have the threaded version of this filter from K&F Concept and I have been very happy with the quality of it. I use it regularly to give a subtle softening effect to my images. This new magnetic version is awesome! The magnetic attachment is very strong and it makes it so quick and easy to install or remove the filter and lens cap. Construction quality is excellent; K&F filters are very much in the same league as Tiffen filters. Highly recommended!

I see that K&F has started to produce a range of different filters (ND, polarizers, and diffusion) using this magnetic system and I would definitely be interested in adding more to my collection because it's a terrific system. It would work especially well for the 10-stop ND filter because that's the kind of filter you have to keep screwing on and off (because you can't see through it to focus), so being able to snap it on and off would make it SO much easier to use.

Great image quality, no noticeable colour cast.
Magnetic ND filters are a must due to constant manual focusing adjustment in between compositions. So much faster than screwing on/off filters. The lens cover is also incredible!