The "K&F Concept Nano-X ND Filter 77mm" comes in an elegant packaging that is easy to open and you can carefully remove the filter. The bag that comes with it is cleanly made, everything looks very elegant and you can expect that at the price. The filter itself is of very high quality and you can see all the key figures directly. Furthermore, it has two brass lugs, which can be easily adjusted. Here you always have a good feeling and you don't over-speed (turn too fast) or too slow, but you always have the right feeling when adjusting. The resistance here is just fantastic. The image you can conjure up from the filter is simply overwhelming and is worth the price. It makes no difference whether you have sun in the picture or are completely blinded, the filter delivers its performance.

➡ Contents

The grey filter is delivered in leather transport packaging, which is closed with a magnetic closure.
The filter itself weighs 92g (77mm) and is easy to screw on.
The two yellow “handles” make the filter extremely easy to turn. Very smooth.
Since there are two handles, one of the two is always easily accessible to both right and left-handed users.

At the moment, I haven't had the opportunity to use it in an extreme situation where the filter would really be necessary. The weather hasn't played along for weeks.
So I was only able to run a few tests where the filter wouldn't really have been necessary. I was happy with the results and couldn't see anything negative.

Gray filters are indispensable in photography. They are used all the time, especially in landscape photography. You know those great pictures with flowing water that looks so “fluffy” and soft – for something like that you need a gray filter, for example.

A gray filter, or “ND filter” (neutral density filter), absorbs the light so that you can expose for longer. This long exposure and the movement of the water make it look so great.
Taking photos with a gray filter darkens the incident light and makes it easier to take photos in very bright environments.
If you use a gray filter in bright surroundings, you can take photos with a wider aperture or longer exposure times.
You can achieve beautiful effects by taking photos with a longer exposure time.
Usually, images are overexposed if you choose a particularly long exposure time.
You can prevent this with a gray filter and take photos with a long exposure time despite a lot of light.
As a result, movements become blurred and merge into one another.
For example, you can depict bodies of water or clouds, as well as fast-moving objects, particularly creatively.

The K&F Concept Nano-X PRO Series ND1000 filter impresses with its excellent quality and is delivered in a stylish case (magnetic closure). Includes a cleaning cloth.
I took five pictures and numbered them. The difference is clear to see.
The filter is worth the money, it is simply screwed on and my lens protector even fits on it.
This filter makes you want more and gets full marks from me!

I already have a few filters at home, including the K&F Concept Nano-X ND Filter 77mm variable gray filter ND2-32 for 75 euros, which I use on my wide angle, for example in bright sunshine (for open-aperture shots) and for long exposures and it's really good.

Now I was able to test the variable ND filter from K&F's PRO series, a filter for a whopping 280 euros. Of course, if you're already working with filters, you should also use high-quality glass on a high-quality lens, but a filter for just under 280 euros isn't cheap and this investment should be carefully considered. What I can definitely say: The filter is at the top not only in terms of price but also in terms of performance and workmanship.

It starts with the presentation (packaging) of this filter, cleanly processed bag with a magnetic lid, suede applications, soft and lint-free lined inside, a band that leads out to the side with which the filter is pulled upwards.
The filter itself is extremely well made and the two brass lugs make it easy to use.
It has a very pleasant resistance when adjusting, not too heavy and not too light.
The glass shows no defects and the threads are also cut absolutely cleanly.
All I can say about the image quality/performance is: TOP!
There are no color errors/color casts or anything else negative here. So I can also work with my lens with an open aperture in bright sunshine and, if I want, I can also use the filter to take long exposures with the aperture slightly closed.
As I said, the image quality for me is as good as if I hadn't had a filter on the lens at all and that's how it has to be.
The shots I uploaded (undemanding test shots) were taken with the aperture open and against the sun.

My conclusion about this filter:
Very high-quality workmanship/image quality flawless/feel excellent. Price very high
Everyone must now decide for themselves whether such an investment is an option.

Anyone who likes photography knows what to use an ND filter for. Since my focus is landscape photography, I can't avoid working with such filters. I ordered this from K&F for my full frame camera.

I was just tired of always filling my backpack with different strengths of ND filters. The Nano-X Pro was just right for me. In order to use it on multiple lenses, I got it in size 77 mm. ordered. I then work with step up rings so that I can also use it on smaller lenses.

To say it straight away: I was amazed by the optical quality and the quality of the images! The workmanship is excellent and very successful. The lens thread is very cleanly cut.
The filter is adjustable from ND 2 to ND 32. The larger steps (f-stops) are marked on the ring and are easy to read. It can also only be rotated in this range from 1-5. It doesn't go below or above that. So you always know what you have set by the stop.

The 77mm. Ring weighs 93 grams on my kitchen scale. Everything is solid and feels very good. The setting works well with slight resistance. That's how it should be.

The optical quality is absolutely flawless and the filter delivers top quality even in difficult lighting conditions. I didn't notice any chromatic aberration or color gradients into green, magenta or anywhere else when pixel peeping. Even with leaves or fir trees backlit and with reflections from dew, the quality of the filter is unsurpassed. Finally an ND filter that does justice to my limited lenses and the full format sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. This means that the filter can also be used on wider-angle lenses without edge shadows.

Thanks to the two screwed brass handles and the ribbing of the ring, the filter can be adjusted very precisely.

Conclusion:
K&F Concept has delivered a top filter here. What's the point if you put thousands into lenses but then bad filters make the job difficult or lead to lousy results? A clear 5 stars+ from me. I hope this is useful for your purchasing decision. The price is also put into perspective because you save at least 4 ND filters.

The "K&F Concept Nano-X PRO ND Filter 77mm Variable Gray Filter ND2-32 (1-5 Stop) Neutral Gray Filter" is delivered in its original packaging.

✅ The workmanship is very high quality to match the filter AND has a sustainable idea and implementation. The interior can be used as a picture frame, which I think is very successful.

✅ The filter is delivered packed in a very sturdy leather bag. A carrying strap is sewn in so that you could easily wear it on your wrist if you wanted to. A microfiber cloth is also included.

✅ The filter itself is really high quality and feels the same. A sturdy and good metal frame with a decent feel. However, there is no surrounding structure compared to the K&F ND1000, but there are two small handles.

✅ The variable gray filter darkens the image by 1-5 stops, which is okay, but is almost too low for long exposures. I was also allowed to test the ND1000 filter, which stops down 10 stops, which makes a huge difference. I didn't notice any aberrations or uneven progression.

✅/⚪ There is an end stop for ND2 and ND32, which I think is successful. Unfortunately, there is no haptic feedback once you have reached a stop. That would have made perfect sense.

⚪ Another thing I would have liked is a sturdy box in the carrying bag. No matter how well and attractively the leather case is made, the filter is not protected against dust and external forces. You shouldn't skimp on it, especially with such a price-intensive filter.

Overall, a really high-quality filter for a corresponding price of just under 300EUR. Whether you want to and have to spend that much remains to be seen. I'm missing a small box and the price could also be lower compared to the K&F ND1000 - variability or not - which is why I give it a solid 4 stars overall if you have the appropriate budget in your pocketbook and can get by with the 5 aperture stops.

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My friend and I have been running a channel on YouTube for several years and have also become partially self-employed through it. We produce content for companies and we have now put together a lot of equipment for this purpose. When it comes to ND filters, we have so far been in the cheap segment and have preferred fixed filters because we haven't heard much good about the cheap variable filters.

We now use square filters with a matte box for larger productions. But especially for smaller orders where we need a lot of flexibility, we rely 100% on the Nano-X Pro. This covers exactly the area we need. The optical quality of the recordings is really great and there is simply no distortion at all. Sometimes we also use an adapter for square filters after the Pro ND. This works because the Nano-X Pro has a thread into which you can screw additional filters.

Theoretically, it is even possible to use this in conjunction with a matte box and a rectangular filter. The possibilities are very diverse.

I can only say words of admiration about the workmanship, simply fantastic. As soon as I unpacked it, I had the feeling that I was holding a super high-quality product in my hands. The workmanship is flawless and the case gives an equally high-quality impression. Adjusting the filter is very smooth and the filter has not tilted once.

I can give my recommendation without hesitation. Anyone who makes the, admittedly quite large, investment will be rewarded with quality and images, which definitely justifies the price. Anyone who claims that a cheap filter does the same thing in this regard has not yet dealt with this topic in detail.

This might be one of the better qulity ND filters that I ever used. I picked 72mm ND filter for my 85mm lens where it suits and works perfectly and also Im using it on my 17-28mm lens that has diameter of 67mm, so i use it together with stepup ring. Here I must say, it does make little vignette at 17-19mm, it goes away at 20mm. But this might be the case due to stepup ring, can't say about experience without stepup ring on this wide lens. This is not yhe case on my 85mm lens. Weight of this ND filter is on a heavier side, which gives it really premium feel so does the glass quality, which is real glass of course.

Overall I'm more then satiafied with this filter and I can recommend it.

I've known K&F for a while now and have one or two of their products (UV filters and camera backpacks). For me, the brand was always technically good for price and performance and was more in the middle price segment.
But now they want to know and are moving into the high class area.

An ND filter reduces the incoming light. With this variable from ND2 to ND32. This makes it ideal for long exposures and to “artificially” extend them. Beautiful, soft gradients can be achieved, especially with moving processes such as rivers, waterfalls, road traffic and others.

The filter comes beautifully packaged and is really fun to unpack. Anyone who loves unboxing will really enjoy it here.
The filter comes in a fabric/leather bag. Very nice in itself, but in my opinion a filter fits better in the familiar plastic caskets.
The inside of the packaging can be converted into a “picture frame”. Funny idea but I think there are nicer ones.

But let's get to the filter itself. Here I have to say that the performance matches the price. Fine workmanship, both on the filter thread, ring and the glass.
The filter can be easily and easily opened and removed again, which is no comparison to cheap filters.
The glass is of the best quality and its optical performance cannot be distinguished from other ND filters from well-known competitors.
This means you have even darkening across the entire image and levels without any loss of quality or any color casts.

All in all, a very good filter in terms of its quality and optical performance. Its weak point is the slightly loose fixation in the storage bag.

What I personally miss are notches so that you know where you are.
I'm a bit conflicted about the price. The quality of the filter corresponds to the price, but I don't know whether I would buy it. Because for that price you can buy a rectangular filter with a suspension and the corresponding filter.
I also find the range from ND2 to ND32 to be a bit unfavorable as it is quite small. But that is my personal opinion and of course always depends on the user.