49mm Magnetic 4-in-1 Lens Filter Kit (MCUV+CPL+ND1000+Adapter Ring+Filter Pouch)

As a landscape photographer, I found this filter system really interesting. Unlike screw filters, these filters can be 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. The K&F Concept Nano Series magnetic filter kit is extremely practical. The case containing the filters is compact in size, which allows us to carry it in our backpacks with very little space sacrificed.
The weight is extremely light, which is really useful for long excursions where the weight of the equipment starts to be felt after several hours.
The installation and removal of the filters is lightning fast, to say the least; in a matter of seconds you can easily fit all three filters and, in just as many seconds, remove them.
The holding power of the magnets is really good and therefore there is no fear of finding yourself with filters that fall during shooting or transport.

This is a solution for one of my pet peeves, taking filters off and on in the field. I always carry a CPL filter with me when doing a shoot, but it is difficult to take them off and on in the back of a Range Rover on the move. This one is protecting my Olympus 300mm f4.0 lens (UV) and allows me to quickly switch to the CPL when I need it. I ordered another set for my 72mm lenses. Great packaging, good carrying case and I'll be able to cover all my field lenses with the two sets. Extremely impressed with the ease of rotating the CPL filter. My lens cap stays on with no problem and can be either on the CPL or the bare magnetic mount. The magnet is very strong, the filters stay where you want them until you want them off.

If you are looking for good quality filters that don't negatively affect your image and are very easy to carry and use, I would definitely buy magnetic ones. Carrying the square ones is sometimes a nuisance and I find the threaded ones much more uncomfortable, apart from the risk of them falling off, I'm a bit handy and it has already happened to me several times with the threaded ones. With these so far no problem and I'm very happy.

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.

Typical of my experience with K&F products, these are excellent filters. They are every bit as good as a couple of other, higher priced, popular and similar products. No color casts, well manufactured, and simply work as described. Save your money and buy these over the more hyped brand names.

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 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