I do love K&F filters. This one is no exception. The build quality is amazing. The clarity is excellent. I love that it has hard stops. I’m using this on my 70-200, and I’m not getting the “X” effect. It stays clear through the entire range. The black-mist effect is subtle—noticeable but not overwhelming; it’s pleasant. If you’re looking for a filter combo that gives you all this without stacking them, this is it. It’s well worth the price.

High quality and fits my lens perfectly.

I love K&F and this is a quality filter. The feel is premium. The movement is very smooth. And it even comes in a nice slim case that looks like felt and leather. I have all of these filters separately but this is the first time I got them all in one. The good thing is, there is no vignetting, so that is the advantage of having them all in one relatively slim and light filter kit like this. However, it just makes for a pretty fiddly setup when you are trying to get shots. I realized I needed to step down the light first, then adjust the CPL. Often I would do this out of order because the light would change, and then I got the wrong angle on the CPL.

Also, it is a lot to also have the mist diffuser in there. But that may just be my shooting style with a mist. I like to blow out the bright light sources with it, especially with things that are edge-lit. But combining it with these other filters just made it harder to expose my shots properly overall.

I think the best case scenario for this is landscape photography, specifically moving water like a stream or waterfall.

The pics I attached are not great. But they are straight out of my S5IIX with a 24-105 F4. Just to give you an idea of what you are working with.

Overall I understand why you would want a nice set like this for some cases, but it is not as versatile for my personal shooting scenarios. I was hoping for a one-filter solution to take on a vacation. I may still bring this because it is so compact, but I would probably also bring my 3 separate filters.

Just a note, don't worry about the orange knob unscrewing and falling off. It seems like it will but it just gets loose and does not actually come off unless you unscrew the tiny screw inside of it.

This filter is a bit on the hefty side, but it is well worth the money. Once you learn how to operate it, you will appreciate the way it is designed. I say this because it through me for a loop at first. I am also someone who attempts to figure it out on my own before referring to the instructions (unless putting together furniture).

The key points to love about this item are:

- Great softening applied to your image with the Black Mist Effect
- ND Filter has hard stops (no "X" pattern)
- Circular Polarizer exhibits no visible color shifts
- Locking pin makes adjustments easy and doesn't come off when loosened
- Waterproof for shooting outdoors

Things NOT to love about this:

- A bit on the hefty side (CPL + ND glass will do that)
- Requires an 86mm cap instead of 82mm

As far as the cons go... the weight is to be expected since they are essentially stacking 3 adapters into 1. It's not super heavy, but it is noticeable that it's there. I also have the 82mm size which is on the heavy end anyways. The cap difference used to bother me, but it's necessary to avoid vignetting at wider focal lengths. I usually have a couple filters on me and keep the original size cap with those. No big deal!

Expanding on the positives... the twist lock bot mechanism really makes this easy to operate. You simply dial in your ND amount first, lock it down, and then use the peg to twist to your desired polarizing position. Magic! The Black Diffusion is always present, so you only need to worry about the other two. If you need to adjust the ND amount, then just be aware that it will change the polarization. You can use the peg as a marker to know where it needs to be as well as your camera screen for confirmation.

Overall, I can absolutely recommend this filter. The materials used are high quality and the images it produces are spectacular. You do have to pay some money, but it is well worth it. After trying enough bargain adapters, you learn to appreciate the good ones (no color shifts, smooth rotation, etc.). You also get a nice carry case with magnetic closure for when it's not on your lens as well as a microfiber cloth for cleaning. It's a winner for sure!

I have used K&F's products over the years and always been happy with the quality, attention to detail and thoughtful design. I own at least 40 filters of all sorts of types and brands and use them very frequently.

To be completely honest, I'm a little on the fence about this 3 in 1 filter as a concept. My initial thought when I saw this filter available was to pass on it because I was doubtful that combining a Black Mist with a VND+CPL didn't make sense to me from a practical standpoint. My main issue with it is that I spend $119.99 and i'm forced to always use the Black Mist with the VND+CPL. I think most professional photographers will likely think similar thoughts as I did.

Next, I thought how I would currently get the effect that this combination filter goes for. That means I put on an ND or VND, a CPL and then a Black Mist. Not to sound stupid but, that's three filters and using 3+ filters at once very frequently can add vignetting on the edges of the frame because the height of the 3 filters combined ends up blocking a little edge light. That's when I thought, AHHHHHH, now I see what K&F was thinking. This particular combination of filters is one that I use frequently, anytime I shoot a waterfall, river, ocean waves breaking on the beach or most varieties of light painting this is a great combination. CPL to help with glare and reflections on water, VND to slow down the light so I can shoot with a longer shutter speed and black mists are a favorite of mine to soften up that moving water so I get a nice smoke or fog effect.

In conclusion.. It's $119.99, for one good filter that isn't bad at all. I personally have several VND's, CPL's and Black Mist filters that are single function so I don't need more of them, but to have one that does all three which is ideal for a type of photography I very much enjoy.. Yea.. I'm good with it.

If you want a very good quality filter that handles a lot of the heavy lifting involved in getting that awesome waterfall or beach waves shot, then I can confidently point you to this filter as a very easy, high quality way to get the shot.

As an exclusive contributor to a prominent stock media agency with 25 years of experience in freelance photography and videography, I offer informed and professional opinions of camera and video equipment.

I will update this review if anything changes within 1 year. A 5-star rating indicates the product meets my expectations for its purpose.

The presentation of the Nano-X series is very nice. It comes in a nice case (fake leather I think) with a magnetic closure and a pull strap to eject the filter from the case. It feels well built and looks nice.

This appears to be the same as the cheaper K-series, with a nicer case and more coatings on the glass. I'm not skilled enough to notice a big difference between them as far as photograph quality, and don't particularly want to test the oleophobic qualities, haha! If this magically resists fingerprints than it is worth the cost difference. If not, then it isn't worth the difference to me.

Things to be aware of:
You will not want to leave this on your lens. You cannot mount additional filters on the front of it (only the back). Lens cap does not stay attached to the front because the front lip isn't really the same size, and of course this filter does not come with it's own. The knob for adjustments will prevent you from using a lens hood, of course.
The polarizer and variable ND work together. Because of this, you need to set ND where you want it first, then the polarizer. The knob for adjustment screws down to lock the ND in place for polarizer adjustment, which is a nice touch and something I didn't realize at first!

The K&F Concept filter fully surprises photographers: it is an exceptional device that will complement every photographer’s collection of accessories. It has granted me the ability to shoot using different colors of mist which was not possible before, to being able to control the exposure properly and many more. It is quite remarkable that ND, CPL and diffusion layers are combined in one filter which makes it very convenient and versatile. The build quality is good and the need for multi-coating technology for the bright color reproduction and minimizing the effects of glare and reflections is proved correct in this case. What I like most about it is that I do not have to use different filter options, in order to transform from one function to another. This filter does not disappoint anytime, whether used when taking landscapes or photos while holding the phone in portrait mode. For a beginner and even for a professional photographer It will be a perfect fit to their camera equipment, I wouldn’t have any hesitation to purchase one.

Fits my Canon 24-105L without any issues (although you won't be able to put on the hood with this on). Filter is well built, designed, and packaged. Comes with a leather case.
Filter itself also has a knob to help with dialing in the setting.
Does a great job in bright environments where you are at risk for washout from excessive lighting.
Overall, very happy with this filter from K&F.

Really makes background highlights have a beautiful bloom and halation to it. 1/4 is pretty strong, but it's not that bad. I like that it spins like it's a polarizer on the front so you can easily see what level of nd you have on. Some get locked in place at a certain point of the lens and it's hard to read sometimes.

I didn't see a major change in the color of the final result, even at full 5 stop nd with the mist effect. There's a little, but it's not bad or pervasive and can be fixed in post.

You can't use a lens hood if you use the filter, but that's fine. You can use your lens cap though. The filter comes with a convenient carry pouch. I'm not a fan of the little handle that K&F uses on these filters. It's not that they are bad, it's just they break pretty easily so be careful. I've had a few bend or break already even when being taken care of.

From the moment you open the packaging, you know you've got a quality piece. I usually don't keep filter cases, but even the leather case is nice. I have a few other K&F filters, but this one just feels better. It's so nice to have a little adjustable knob to dial in the stops. Excellent piece of glass.