I only use it for video, and I find it helps me get the right exposure. Good

The package containing the K&F Concept Nano X-Series Variable ND Filter ND3-ND1000 Gray Filter 67mm (1.5-10 stops) was delivered quickly and safely packed.
I love taking pictures and was happy to be able to test this filter.
The black outer box with the filter was once again covered with a plastic film, so that also no moisture could penetrate. The filter itself is in a high-quality plastic case. The flap of the case is magnetic. So no unnecessary fumbling around to get to the filter. Very practical: The filter can be easily lifted out by a strap.

The filter itself is made of Japanese optical glass with 28-layer nano-coating on both sides, which should prevent some lens reflection and of course glare from div. light sources. According to the manufacturer, the ND filter is waterproof, oilproof and dustproof, which is good for the requirements especially in nature and hiking. I have the feeling that the filter is very robust. But also has quite a weight with lens size 67 mm. Of course, the price is also accordingly appropriate.
The frame of the filter is made of aircraft aluminum, has an ultra-wide angle construction and is just 7.4 mm thick. Those who, like me, have always used a few different dark gray filters will appreciate this fact, especially when hiking. You simply need less space in your backpack and the weight is also kept within limits. One case, one filter.
I use gray filters especially when taking pictures of water at the lake or of flowing water or waterfalls. Also, for long exposure shots of places you'd like to photograph without people, a piece like this is fantastic.
The function of this adjustable filter is quite simple. Just press the handy slider and the filter will darken or lighten as needed. So you can easily try different settings and effects without having to constantly change filters.
Conclusion: the price is in the normal range with this kind of aperture level adjustability. Sure there are cheaper ones, but the K&F filter is already built a bit higher quality. The results are quite respectable. Since I'm not a professional, but just enjoy taking photos, this filter is actually a great companion for me and I'm happy to recommend it.
See photos, which I will post a little later due to the (somewhat stressful) Christmas season ;-))

I was pretty late to jump on the ND filter trend because I'm an old photographer and still shoot film 90% of the time. In film, we learned how to make camera adjustments to achieve the same thing you would with these filters. Well, almost the same... I am shocked at how much easier it is to work with this variable ND filter in hard light and shoot long exposures!

One question I had was, "Does this work with film or pretty much just for digital?" and I'm happy to say that it does work for film, but I think its greatest strength is in digital photography.
This filter is one of the highest quality filters I've ever seen. It turns silky smooth, but has enough friction that it stays exactly where you set it and doesn't slip when you make another adjustment. I couldn't believe my eyes, but it also works as a mild polarizing filter. I was able to shoot in very bright and harsh sunlight and have an exposure of almost 2 minutes with the darkest setting, so I could see right through the reflection of the water. I have never been able to do that before!

I also love the little orange nub they call the "putter" on this filter. It just makes adjusting so much easier. I'm totally sold on using ND filters now, and since this one is variably adjustable, it's the only one I'll ever need! very happy with it!

Plus point for the case!!!

I'm new to this brand of lens filters, but I'm happy with the image quality and fit on my lens. It is easy to adjust and stays at your chosen setting while shooting. I was able to take some great waterfall pictures and a sunset picture with this filter, and you can't tell the difference between this and my expensive brand ND lens filter when you review the pictures.

What I particularly like about the X-series is the high-quality case that comes with the filters! In this case, it was a (faux) leather case with a magnetic closure, which looks very classy. The filter also does a great job and doesn't affect the image quality in any way!

Excellent, above all it allows you to shoot in all the conditions with the settings you prefer.

Since I started testing K&F filters, I have become a big fan of the company. The quality of the filters and construction are excellent. The glass was of exceptional optical clarity and the brass rings are precision machined. I have never had any problems with cross threading or pulling off. The filters go on very smoothly and come off just as smoothly.

They are all filters that have just enough friction to stay where you put them, but they turn buttery smooth on the camera so you don't have to worry about moving your camera around on the tripod. They are just a real joy to use. This Euler filter per check mark has corresponding markings on the edge so you know which stop you're at, and it has a little tab that makes it easy to rotate the filter. It is very unobtrusive and should not interfere with your image, i.e. no vignetting.

In the old days, one problem with variable neutral density filters was that you would see this artifact of the two polarized plates crossing and these optical "X" artifacts in your image. I believe the newer ones used spiral circular polarization so you get an image without artifacts.

This filter does exactly what it is supposed to do, darken your image to allow longer exposures, or just block out extreme light and glare on a very bright day.

One thing that strikes me about this filter is that its metering is extremely accurate. If you say it for four stops and then take it off and lower your camera by stops, the lighting will appear identical, although there will be a little more glare without the filter because the polarization also reduces the glare.

Another optically perfect excellent filter from K&F.

Maybe I simply got a better model, or the expectations of some other reviewers regarding the effects of a completely darkened ND3-1000 are simply too high. Of course, you can see optical effects when you set the ND filter to ND1000. It's not without reason that there are much more expensive ND filters that only cover the ND2-ND32 range. We're all looking for the perfect all-rounder, but in reality, there isn't one. I really like the Nano X series. I already own several filters from this series and I'm absolutely satisfied. For the price, you simply can't complain, and I personally find the effects with ND1000 acceptable. If I want to take particularly high-quality photos, for example with long exposures, then I use a fixed ND1000 filter anyway. However, if I'm on the go and want to be prepared for different situations, I take the ND3-ND1000 with me. The filter is extremely well-made, which you can tell by the way it feels when you pick it up. I'm used to this kind of craftsmanship from K&F Concept, as my tripod, lens adapters, and other filters are also equally well-made. I can definitely recommend it if you have the right expectations for a filter like this.

This filter is perfect if you want to shoot in bright daylight with the aperture wide open. Well built and easy to use.