I use a Fujifilm X-T3 camera and have this to match my 55-200mm zoom lens. The mounting ring attaches easily to the lens and I'm a big fan of the magnetic attachment for this filter. There are many different brands of diffusion filters. I have used Tiffen brand filters in the past and have always been happy with them, but when I came across the K&F filters I was dying to try them.

I have used K&F products in the past and have been particularly pleased with their lens adapter system (I used to shoot with Pentax cameras and lenses and their excellent lens adapter has enabled me to use my old Pentax lenses with my Fujifilm camera.

This magnet system does not disappoint. Replacing the filters is very easy with the magnetic attachment system. The lens cap for the filter system has been criticized by some but I think it works very well. It actually reminds me of some lens caps on my Pentax system, so I felt very comfortable with them.

As for the quality of the diffusion - excellent! I really enjoy the softer look this diffusion delivers without being too heavy.

However, one thing surprised me a bit. I expected to be able to install this filter system and then still use my tulip shaped lens hood, but I can't do that with this K&F attached to my lens. To be honest I wouldn't be surprised if that really is the Fujifilm system's fault as I've found the lens hoods to be difficult to attach compared to other camera systems I've used in the past. That said, I intend to purchase more K&F brand ND filters to take full advantage of this magnetic attachment system. It's a winner in my book.

I use a Fujifilm X-T3 camera and have this to match my 55-200mm zoom lens. The mounting ring attaches easily to the lens and I'm a big fan of the magnetic attachment for this filter. There are many different brands of diffusion filters. I have used Tiffen brand filters in the past and have always been happy with them, but when I came across the K&F filters I was dying to try them.

I have used K&F products in the past and have been particularly pleased with their lens adapter system (I have previously shot with Pentax cameras and lenses and their excellent lens adapter has enabled me to use my old Pentax lenses with my Fujifilm camera.

This magnet system does not disappoint. Replacing the filters is very easy with the magnetic attachment system. The lens cap for the filter system has been criticized by some but I think it works very well. It actually reminds me of some lens caps on my Pentax system, so I felt very comfortable with them.

As for the quality of the diffusion - excellent! I really enjoy the softer look this diffusion delivers without being too heavy.

However, one thing surprised me a bit. I expected to be able to install this filter system and then still use my tulip-shaped lens hood, but I can't do that with this K&F attached to my lens. To be honest I wouldn't be surprised if that really is the fault of the Fujifilm system as I've found the lens hoods to be difficult to attach compared to other camera systems I've used in the past. That said, I intend to purchase more K&F brand ND filters to take full advantage of this magnetic attachment system. It's a winner in my book.

Admittedly, the system of magnetic filters is not entirely new and I cannot say who copied from whom, but I already know K&F from their very good lens adapters and solid tripods. And since I've been flirting with magnetic round filters for a long time, but up to now the prices for such a system have seemed too steep to me, I was of course interested that K&F now also offers something like this.
You can read in my review whether the magnetic K&F round filters were able to convince me or whether the low price demands too many sacrifices here...

So far I have used screw-in filters from Rodenstock, B+W, Heliopan and Haida. So everything is more of a brand where a filter likes to cost what K&F wants here for a complete set including a bag. I was therefore very skeptical about what to expect, also because K&F advertises with Schott glass (hardened and therefore very robust) and 16-fold nano sealing. That sounds surprisingly good at first, but it doesn't have to mean anything in practice, because in the end it's always the optical performance that counts, no matter how great the handling advantages are.

Which is actually better, round filters or a 100mm filter system with plate filters, this question will certainly be asked by everyone who gets into the subject of filter photography. So far, round filters have always had to be screwed into the front thread of the lens, which can be very cumbersome depending on the situation and the lens. Even when several filters were combined, each one had to be screwed onto the previous one individually, which in turn very quickly leads to vignetting, at least whenever the filters have the same diameter as the lens. Therefore, a 100mm or even 150mm plate filter system has always been the first choice for professionals.

But now the topic of round filters has been revolutionized by the introduction of magnetic filters. Changing filters has become so simple that the handling advantage of plate filters no longer exists for me. On the contrary, with plate filters I always have to be extremely careful not to accidentally grab them (fingerprints) and that unfortunately happens very quickly when taking them out of the bag or putting them in the holder. Unlike here with a round filter with its metal frame. Of course it can also happen here that you accidentally touch the glass, but the risk is much smaller and round filters are much more robust. Anyone who has ever dropped a plate filter will know what I mean

It seems like an easy system especially if you can get magnetic rings for same size filter on different lenses

I use a Fujifilm X-T3 camera and got this to go with my 55 - 200mm zoom lens. The mounting ring attaches to the lens without issue and I am a big fan of the magnetic attachment for this filter. There are many different brands of diffusion filters out there. I have used Tiffen brand filters in the past and always been happy with them but when I came across the K&F filters I definitely wanted to give them a try.

I have used K&F products in the past and have been particularly happy with their lens adapter system (I used to shoot with Pentax cameras and lenses and their superb lens adapter has allowed me to use my old Pentax lenses with my Fujifilm camera.

This magnetic system does not disappoint. Swapping filters is super easy with the magnetic attachment system. The lens cap for the filter system has been criticized by some but I find it to work very well. It actually reminds me of some of the lens caps from my Pentax system so I felt very comfortable with it.

As for the quality of the diffusion - excellent! I really enjoy the softer look that this diffusion supplies without it bein too heavy-handed.

I was a bit surprised by one thing however. I expected to be able to install this filter system and then still utilize my tulip-shaped lens hood but I cannot do that when this K&F is attached to my lens. To be honest, I wouldn't be surprised if this is really the fault of the Fujifilm system as I have found their lens hoods difficult to attach compared to other camera systems I have used in the past. That said, I intend to get some more K&F brand ND filters to take full advantage of this magnetic attachment system. It's a winner in my book.

Magnetic Filter Attachment, quick and easy to attach or remove from the camera lens.
THe 1/4 Black Mist filter is fantastic and definitely one of my favorites. The Filter comes with 3 items

1) The Filter Ring that threads on to the lens end
2) The Magnetic filter
3) Magnetic Filter Lens Cap.

Common Question(s):
Can you use the canon lens cap with the Magnetic ring installed (YES)
Can you use the Canon lens cap with the magnetic Filter in place (YES)
Can you use the Lens Cap with the magnetic base without the filter magnetically attached (YES)

Overall, really good quality lens and it is a breeze to install. The Magnetism is strong and the lens cap does not fall off nor does the filter. It has just the right amount of magnetism to keep everything in place.
Very Good Lens and Concept for mounting it to the camera.

I have the K&F magnet system on all my lenses and, in addition to the Black Mist, I have several of the appropriate ND and CPL filters here. They're so handy, easily stackable and the connection is strong enough that I don't have to worry about one of them falling off. The black fog effect is very low here and is only really noticeable with a lot of backlighting. Many cheaper filters often have a color cast, but I didn't notice that at all with the K&F.

The only downside is that with my Sony lenses, at least the included magnetic caps are really hard to pull off when you have the lens hood on the lens (either forwards or backwards). A grippy element on the front of the cap would have helped. I could 3D print a holder and glue it in there to fix it. As the caps aren't really the main reason for using a magnetic filter system although I still give 5 stars they would have been a nice bonus if they worked well but they aren't really critical to the product.

I'm really excited about these new filters that K&F is releasing. The magnetic filter system is a great idea for strong ND filters as I often have to compose my shot without the ND filter attached (because without it it's much easier to see through the lens) and then have to attach it to take the shot . Being able to easily snap the filter onto the front of the lens takes a lot of effort out of removing and reattaching the filter.

The optical quality is excellent, with excellent clarity and hardly any color cast. The processing quality of the metal rings is solid; They are smoothly machined with smooth edges and beautiful knurling. The rotating ND filter rotates smoothly, with hard stops at both ends of the spectrum so you'll know when you've reached the limits.

The magnetic attachment keeps the filter firmly in place, but is probably best used in controlled tripod setups where you know the lens won't be bumped. I definitely wouldn't use this in mass situations where someone or something might knock the filter off, as it wouldn't take much of a jab to make that happen.

No lens cap is included, presumably because the extra weight would make the filter too heavy for the magnets to comfortably hold. K&F makes a magnetic lens cap that I got with another K&F filter set, but it doesn't fit on the outside of the ND filter because the outer ring is larger than 77mm. However, the magnetic lens cap fits on the inner ring, so you can use it when you don't use the ND filter. As far as I can tell, you can't buy the magnetic lens cap individually, only in a bundle with other filters.

The quality of this filter is quite comparable to that of Tiffen. It's reasonably priced and I would definitely recommend it for tripod landscape photography.