Why an ND filter?

An ND filter (gray filter or neutral density filter) ensures that less light reaches the camera sensor. As a result, it is necessary to expose for longer periods of time. To do this, you have to open the aperture wider or increase the ISO so that the image is not too dark.

Variable ND filters are primarily used when filming, as long exposure times must be used there. In order to have the right exposure at all times, it is important that you can adjust the ND filter.
But ND filters are also used in landscape photography, in particular for long-term photography in daylight, e.g. at a waterfall, sea or lake. Passing clouds can also be drawn softly with the help of the ND filter.
In very bright lighting conditions, such as in snow or in the blazing midday sun, a weak ND filter can be useful, especially if you use a lens with a very large aperture.

The K&F Concept Nano-X True Color Variable ND Filter 77mm neutral density filter ND2-32

The filter is manufactured to a high quality and packaged in a leather case with magnetic closure. This variable ND filter has 5 ND filters,

so to speak! You normally pay between 70 and 100 euros per high-quality ND filter! This variable ND filter is very practical and space-saving, as you only need to have one filter with you and can still cover a small range with it. This ND filter can dim the light in 5 steps.

ℹ️ At the edge of the adjustable filter, there are 5 points, the larger the points are, the darker you can adjust your image.

The coating technology used ensures that the natural colors of the motif are faithfully reproduced, and thus prevents the usual yellowing of cheaper ND filters.

⚠️ Please do not screw the filter so firmly onto the lens, otherwise there will be problems with unscrewing it!

Clear purchase recommendation and 5 stars from me.

Even though I have a ND filter I opted to get this due to the the orange lever to rotate through the density stops. When using my other one with no defined stops it was easy to end up accidently unscrewing it off the lens. This little "nub" makes for much better use of the filter with smooth rotation and stops at each end. I have not had this one long enough for a full test but having a couple other of their filters I find them as good or better than any I have used. Even though I have still have some German made filters K&F is now my choice for my filter needs. They are meticulously crafted and beautifully presented.

I bought this filter primarily for videography, where I usually film according to the 180-degree rule. This means that in order to obtain a cinematic video image with a certain amount of motion blur in individual frames, you film with a shutter speed that is equal to 1 divided by twice the number of frames. If I film at 50fps, for example, I therefore need an exposure time of 1/100s, which is not possible without an ND filter, especially in the wide angle range when the sun is shining.

The filter is also suitable for photography, even if only to a limited extent, as greater darkening is often required in certain situations. When I want to produce soft water on a stream in bright sunshine, I often travel with filters beyond ND1000, as well as when I want to show a busy area deserted of people.

But as I said, that is also very special and in my case this is about videography. The filter is intended for my 100-300mm MFT lens, which I usually use to take wildlife pictures. In the test, the filter shows no weaknesses. As a result, I was unable to identify any color cast and an X-Cross effect did not occur either. The promised effect of up to 5 f-stops is kept. Top!

The filter comes in a synthetic leather case with magnetic closure and an “removal aid” in the form of an integrated ribbon so that you do not accidentally touch the glass when removing the filter. The bag also has a magnetic closure.

The filter itself weighs 43g (reweighed) and runs very smoothly with appealing resistance over all aperture levels. Thanks to the adjustment aid, you can of course no longer use a rigid lens hood, but you can also remove the adjustment aid if the appropriate tools are available.

Technically speaking, this filter, which is the “little brother” of the Nano-X Pro, is therefore also extremely high-quality at a third of the price. The Nano-X Pro series is, however, a bit higher quality in terms of frame and coating.

The price-performance ratio is great.

If the review helped you, I would be happy if you click on “Useful”.

Last but not least, I received the product free of charge as a Vine product tester, but this has no effect on my review. I also only test things that I can usefully use myself and integrate into my everyday life.

The K&F Concept Nano-X True Color Variable ND Filter Neutral Density Filter ND2-32 is relatively weak because other filters go up to ND1000. But of course, it has a fine gradation at the bottom. I tested it on running water and that in strong sunshine. This was then only possible manually at aperture 8-11 and a slower shutter speed. But I also have to admit that I'm not the professional and I don't know all the tricks. In addition, there is hardly any flowing water in my area that can be allowed to flow smoothly with such a filter. I live in the lowlands. This filter has 1-5 stops. From the same manufacturer, there is also a filter with 1.5-10 f-stops, which is even slightly cheaper. That would be the K&F Concept Nano X-series Variable ND Filter ND3-ND1000 gray filter. I would rather use it for strong sunshine. This one is quite okay for German bad weather, i.e. when it is cloudy.

The ND2-32 neutral density filter comes in a very practical leather case. There is a ribbon on the side, which helps to eject the filter. The clasp is magnetic. The adjustment of the filter is smooth and simple. I use a Canon EOS M10 with a UV filter. This filter could be easily attached to it. Only the cover cap (lens cap) then no longer fits on.

Conclusion: The quality seems very good to me and the filter does what it should. I can't say whether yellowing is prevented, as I lack the knowledge here. The product makes a very good and professional impression on me.

Hope my review was useful.

Variable ND filters are primarily used when filming, as long exposure times must be used there. In order to have the right exposure at all times, it is important that you can adjust the ND filter. Inexpensive variable ND filters usually have a yellow tinge. This, of course, falsifies the white balance and the image effect. Unless you want it that way. I still like to use variable filters though. Especially for long exposures on water. But I've often been annoyed by the falsified color effect. The ND filter reviewed here is clearly not one of the cheap filters. It also comes in a very nice case when it arrives and it even has a handle that allows you to adjust it very comfortably on the camera. As you can see from the pictures, the color effect does not change. Aperture, shutter speed and ISO were the same in each case. Only the filter was adjusted. I think you can easily see the quality of the filter there.
In general, I would like to warn against turning on the filter too firmly or slightly crooked or using it at sharply changing temperatures. It happened to me several times that I couldn't get the filter off anymore. This was then only possible with the appropriate filter clamp.
I didn't have any problems with this one though.
I really like it. But that should be the case, as it also costs significantly more than the inexpensive league.
5 stars.

In contrast to classic ND filters, the intensity of this filter can be adjusted in a range of 2-32. This is done by turning the filter; for this purpose, there is a small nup on the filter, which can be used as a 'handle'. Clever.

It comes with a high-quality case.

The filter doesn't run smoothly. If it were this, it would be difficult to set and, in the best case, maintain the desired filter effect. So: There is always something.

Overall, the filter is quite heavy due to the bonus function. Personally, I wouldn't use a filter for a single f-stop, it's actually not worth it.
However, I find it good to remain flexible when setting the effect.

Top workmanship, color distortion 0. All good.

The first impression of the ND filter is very good, the materials and workmanship look high-quality, the thread runs smoothly in my lenses and the adjustment itself is very pleasant. I really like the fact that the adjustment range is limited in both directions by a stop, so that accidental overturning is prevented.
The filter also does a good job in other respects, I was unable to notice any color cast or irregularities in the darkening in the entire adjustment range.
The price of currently 94.99€ is not particularly cheap, but in my opinion it is absolutely justified.

I am rarely let down by K&F filters and this one is equally as gorgeous. The build quality is fantastic and the toggle allows you to easily use the filter even if you’re wearing gloves. This is a precision CNC machine to aluminum frame that moves incredibly smoothly. The variable density transition smoothly without visual artifacts and that’s the most important part.

I would prefer brass of course and I think these days filters need to be magnetic. The days of spending hours screwing in unscrewing filters into your camera no longer need to be necessary. But for the quality of the filter and the price I’m still going to give it five stars.

Use the filter for filming if you are traveling a bit more compact without a matte box on the front of your optics — after a few weeks I can only say that the K&F filter is doing really well!

✅ No X-pattern at high ND values
✅ No obtrusive color cast visible in video material
✅ Practical transport bag with magnetic closure
✅ Filter runs pleasantly smoothly and is easy to use

... Of course, the higher-quality K&F Nano-X Pro or NISI True Color ND works better, especially when it comes to coatings, but then costs more accordingly. From a price/performance perspective, there is really nothing to complain about the K&F Concept Nano-X!

The filter comes very well packaged in a nice magnetic closure box. The actual storage takes place in a high-quality leather case with an “ejection tape” so that you don't have to tap your fingers into the filter disc when removing it.

The filter and its mechanism are manufactured to a high quality, meaning that the filter thread can be easily screwed in without rubbing noises and frequent attempts to fix it and, after tightening, can be removed again with moderate force, provided that the inner thread of the lens is not damaged.

The special feature of this (ND) filter, however, is of course the ability to infinitely adjust the filter degree/strength using the screw-on brass handles, which also works very smoothly and impressively! For example, changing the filter is largely unnecessary, just a grip on the rotating ring is enough and you continue to dim or flash on accordingly. The range in which the filter effect can be changed is enormous - this saves a few filters and allows fine and easy adjustment until the desired effect is achieved!

Even though it doesn't quite come close to the Pro series, you still get a very high-quality filter and, with the variability offered, a very fair offer!