I am very pleased with this system and the quality of the filter lenses. It is wonderful for very quick changing of filters. Unfortunately I accidentally lost the ND filter the first time I went out and did not realise it until I was back home. My friend had zipped the bag they come in, and I, thinking it was still open and more concentrated on trying the one on the camera. unzipped it. So during my wanderings, the ND fell out. I did eventually manage to replace it, and received a magnetic lens protective cover as part of the order. I am made up now. I do recommend this system and it has the filters that I use, perfect.

This is a kit,the combinations to use CPL and ND1000 can be:
-Adapter+CPL, Adapter+ND1000 or Adapter + CPL + ND1000.
-UV Filter + CPL, UV Filter + ND1000, UV Filter + CPL + ND1000, UV Filter+CPL+ND1000

Comes in a padded case with a reverse zip to prevent any water from getting inside in case of rain. It can be clipped on the belt or anywhere else for comfortable use or transport.

As far as image quality is concerned I have few complaints, I haven't noticed any loss of sharpness or colour cast. I have been able to use both the UV+CPL+ND1000 up to 12mm on my APSC camera without vignetting.

I am very pleased with this system and the quality of the filter lenses. It is wonderful for very quick changing of filters. Unfortunately I accidentally lost the ND filter the first time I went out and did not realise it until I was back home. My friend had zipped the bag they come in, and I, thinking it was still open and more concentrated on trying the one on the camera. unzipped it. So during my wanderings, the ND fell out. I did eventually manage to replace it, and received a magnetic lens protective cover as part of the order. I am made up now. I do recommend this system and it has the filters that I use, perfect.

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.

I really like the convenience of this magnetic filter system. You only need to thread on the base ring and magnets do the rest. Makes it less likely to damage the threads of your lens if you don't have to keep putting on and removing a filter on every time you need to use it. I am using this with a 24-105mm full-frame lens and the base ring works with the lens cap and the hood although you probably need to remove the hood to snap on the filter because otherwise your fingers get in the way.
Each of the filters themselves are quite a bit heavier than the screw on K&F versions, probably because they need to make the filter ring out of a magnetic steel instead of aluminum. Whatever the reason, they feel a lot more premium than the regular K&F version.
In terms of performance, its a bit of a mixed bag. I don't have tremendous experience using CPL and ND filters (this is my first set) so I don't know what's considered good performance at a given price range.

Moving on, the CPL filter (photos looking out the window) has similar vignette to the ND filter at 24mm but appears to cut down quite a bit of reflections in my windows. Not much for me to point our here, it seems to do the job.
The set does come with a UV filter but I do not intend to use it unless I am in a rainy/dusty environment where my lens needs a bit more protection so I haven't tested it out yet.
For both the ND and the CPL filter, I did not detect any noticeable decrease in sharpness caused by using the filters.
I think the performance of these filters is acceptable. I am a little disappointed with the vignette but I have heard of much more expensive filters having similar issues so I don't want to be too hard on this set. All in all, for someone like me who does this for fun, I think its a great system to learn the basics until I can justify the move to something more premium.

Admittedly, the system of magnetic filters is not entirely new and I can't say who has copied from whom here, but K&F is already known to me through very good lens adapters and solid tripods. I was of course interested to hear that K&F now also offer such a system.
Whether the magnetic K&F round filters could convince me or the low price demands too many sacrifices, you can read in my review...
So far I have used screw-in filters from Rodenstock, B+W, Heliopan and Haida. These are all brands where a filter tends to cost what K&F wants for a complete set including a bag. I was therefore very sceptical about what to expect, also because K&F advertises Schott glass (hardened and therefore very robust) and 16-fold nano sealing. That reads amazingly well, but in practice it doesn't necessarily mean anything, because in the end it always comes down to optical performance, no matter how great the handling advantages are.
The set contains in each case...

- a very delicate adapter ring to screw in
- a UV or protective filter (to protect the front lens)
- a CPL polarising filter (removes reflections and enhances contrasts)
- an ND 1000 filter (darkening for longer exposure times. Water becomes silky, clouds blur)
- a storage bag
the filters, their workmanship and feel, is great. There are no visible defects, the threads of the adapter ring and UV filter run silky smooth, the holding force of the magnets is just right and even the fine knurling of the edge is perfectly finished. If it didn't say K&F on it, I wouldn't be able to distinguish the filters from any of the branded filters in my portfolio, purely from the outside
I don't know how K&F managed to do this at this price.
The most time-consuming part is opening the bag, the rest, well, "snap" and the filter is changed. The magnet has so much power that even if I attach the lens cap, there is no danger of anything coming loose at any time or in any position!
The whole thing is so ingenious that I ask myself why someone didn't think of it much earlier. Gone is the fiddling with unscrewing and how often I used to be annoyed that the filter is difficult to put back down again

I am absolutely satisfied with the overall package price performance is definitely right here the magnet is sufficiently strong, the bag offers good protection and can be fastened well with the double Velcro fastener and the eyelet for a hook I would buy the magnetic filter set again at any time

Delighted with my 55mm magnetic filter kit. It consists of 4 components, an adapter, a UV filter, a polarizer filter and a ND1000 filter. Both the polarizer and the UV filter are threaded, so they can be screwed on the front of the lens, but they also have a magnetized part, so the rest of the filters can be magnetically attached to them. I have several types of filters, threaded, square and these. Without a doubt, the magnetic ones are my favourite filters, I am very happy with them as they are very comfortable to use, especially for that reason, for the comfort of use. It is very easy to put on and take off any of the filters. You leave the UV or the adapter and it's instantaneous to put on or take off any of the others. I always use the UV, which also has a thread on the outside so I can put the cap on, the thread is fine, but the cap stays on and doesn't fall off. This way, I always have the camera ready to attach any of the other filters quickly and easily.

I purchased this K&F Concept 67mm Magnetic Lens Filter Kit
for my Tamron 28-75 f2.8. These filters work great and fit on my new camera.quality looks good.
It was a great choice!.... It allows me to capture long exposure water shots on bright, sunny days. It's not a variable and it's too dark for those dark dreary, overcast days. You'll want a different filter for that. The filter is well made and easy to thread onto my lenses. It also comes with a nice case to store and carry. The images come out clear and sharp with no vignetting, like you might get with some filters. Great value, definitely worth the money. I am happy with this purchase.

These are so easy to use and the quality is fantastic - both the build quality and the picture quality. I can't see any colour cast whatsoever from both the CPL & ND filter. I think you would really need to pixel peep to see any sharpness difference, and even then I'm not sure there is.
Being able to attach the filters to both the UV filter and filter ring is really clever - I keep the UV on my 24-70 F4 and the filter thread ring on 16-35 F4 so it makes it even faster to clip on the filters no matter what lens I use.
Since the ND isn't variable, there's no dark X. And no vignetting at 16mm, unlike when I use my square filter set.

The downsides that I see at the moment:
- You can't replace the filter thread on its own, so if you break or lose it, you have to buy a new set.