Finally after 3 products from K&F I found what I was after, the 1st set, screw on one's are good but too fiddly for me, 2nd, square set again great but can't fit lens cap & not enough filters in the range, & finally this set, absolutely fantastic, everything I was wanting, more ND filters will be added to the range, magnet is good, filters have next no colour cast, the CPL is great to use, quick & easy changes with no fuss, compare these with more expensive brands & you will wonder why you spent all that money, these do everything...if not a little better than a few well known products out there, I am so pleased with these I am going to feature them in my YouTube channel.... Moto Tripper UK.

Been wanting to try these K&F Concept Magnetic Filters since they were announced,
I’m glad I purchased these they’re awesome,
Super easy to use and swap when in the field,
Just attach the magnetic ring to your lens and then it’s simply a case of attaching the filters with ease and swapping out,
No hassle of having to screw the filters on and off, this is totally a game changer in my opinion, I own a fair bit of K&F gear and these are great quality as always,
I have the k&f square filter kits but these are way easier,
The supplied case is really nice too,
They’re not cheap but you get what you pay for, I’m overall extremely happy

I am absolutely satisfied with the overall package price-performance is definitely right here the magnet is strong enough and I could not find any gaps as described in other reviews the bag offers good protection and can be easily attached with the double Velcro fastener and the eyelet for a hook I would buy the magnetic filter set again at any time

Molto comodi con il meccanismo magnetico. Più volte quelli a vite mi sono rimasti incastrati nelle lenti. Con il ring magnetico sono veloci da cambiare e usare. Quelli di 82mm sono compatibili con il sistema Kase che offre più scelta di filtri ma a un prezzo più alto. Io ho un mix ora dei due brand e mi trovo bene. Per qualità prezzo i filtri K&F si posizione in un ottimo posto. Io li raccomando vivamente

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 very well made and resistant 4 pocket pouch 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 filters, there is no loss of sharpness, and color drift is almost zero. 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 release, I hope that other intermediate magnetic filters with this system will be released soon to complete the offer.
If there were magnetic lens caps, that would be great.
It is a very good investment and the price is more than correct given the quality and the results obtained.

As a landscape photographer, I found this filter system really interesting. Unlike screw filters, these filters are applied and removed in a fraction of a second, while unlike plate filters they are much less bulky, lighter and, of course, much quicker to install.

PACKAGING AND CARE OF DETAILS

The filters are delivered in a convenient and very well made case with four compartments. The case, in the back, has a hook and loop buckle that we can use to attach it to our tripod or our trousers and, in addition, a metal ring so that it can be attached to our backpack, tripod column or wherever we prefer. Finally, the zip closure of the case is resistant to rain or water infiltration.
The filters are contained and protected individually inside special sachets so as to avoid any potential damage.

CONSTRUCTION

These magnetic filters from the K&F Concept Nano Series are made of optical glass that is perfectly resistant to water, oil and dust. The external frame is in slightly knurled aluminum to allow an excellent grip.
They are extremely thin and, even by mounting all three filters at the same time (UV, CPL and ND1000), the thickness is extremely low.

UV FILTER

In the photographs I took with the UV filter there are no color alterations, no loss of sharpness and details and no dominants of any kind.

POLARIZING FILTER

This polarizing filter provides a pleasant overall contrast to the image, increases the contrast between individual colors and saturates them without overdoing it. In addition, it provides a very slight warm cast which, personally, I do not mind but which is easily corrected in post-production.

All 3 filters for me are very useful. The stand-alone ring however, I'm wasn't sure how much I'll actually use it but surprisingly I just leave it on my lens unless it's pretty bad weather, which in turn I use the UV filter as a protective layer for the glass. Personally, I haven't found the UV filter to do much other than to protect my lens and because the glass of my lens is such high quality I don't leave it on as it could degrade the photos, that's why I use the stand-alone ring. I haven't noticed any degrading when using the UV filter so no complaints. As mentioned earlier, however, I only use it to protect my lens. The CPL filter works wonders and the ND filter is great for long exposer shots. the combination with the magnetic touch make this absolutely flawless. would recommend.

I own quite a few K&F Concept Products. They provide quality products without the hefty price tag we're used to see in the photography world.

Let's talk about the filters individually first. All 3 filters are of top quality, at least on this price point/tier, as we're used to get from K&F Concept products:

-The CPL Filter has no color shifting and performs as expected.
-Same with the ND1000, although i don't use 10-stop filters that often (my most used filter is a VND Nano from K&F Concept) during my test it worked well, no cross present, even while using step-up rings.
-The UV Filter has no color shifting and the main purpose these days of the UV filter is to protect the lens surface, BUT, It is where this VERY MINOR issue this kit has: The magnetic ring holder.

The magnetic ring holder works great with the ND and the CPL, just not as good with the UV Filter, but it is not by ANY MEANS bad or i'd call it unsecure, at least not on the 82mm filter size version, your mileage may vary depending on the kit size you got as the magnetic surface may be different for your version, just the grip doesn't feel as tight as it does with the other two filters and there is a TINY bit of play, but not enough to warrant losing a star over it, i mean if you shake the camera at full strength you may drop it, but on regular usage i do not see it just falling off the ring holder.

As the sum of all parts i'd say this was almost perfect. This kit complements my VND ND2-400 and includes everything i need to cover all my filters along my step-up rings. The UV filter thing doesn't make it lose a star, but maybe half, so i'd say 4.5 but since there's no option for that if i had to decided between 4 or 5 stars, i'll go with 5.

I shoot in various elements and destinations where lighting is different and filters are needed for optimal results. I have been using the traditional screw on filters but I find it time consuming especially how it needs to be aligned perfectly on your lens, taking up to a few minutes for each one when I could miss the opportunity of my shot. I find this K&F filter set to be a great choice for me. I am no professional by any means and take photos for fun with my Nikon d850 and these filters have worked great for me. The magnetic adapter ring is easy to screw on the lens and the lenses stick to it well. These lenses work great in the rain and are not only waterproof but the water beads off of them. I have not had any issue of fogging between the lens and filter.

The come packaged nice in a hard case, each in its own slot. I find this to be a great value for all of the different lenses offered in this set and I am extremely happy with them.

I needed a more travel friendly set of filters to take with me on my hikes that would be too cumbersome to use my square ones. Having these filters in it's own soft pouch was perfect and it didn't take up much room in my camera cube. The magnets were strong as they held on while I was setting up my composition - sometimes in the rain and while on uneven ground.

UPDATE 10/26/21: After over a month, I've already lost a CPL filter. Make sure the filter is flush in either the UV adapter or adapter ring. I was busily setting up my camera on a cliffside when I accidentally bumped my tripod and the CPL filter fell off.