I had a few individual filters with me occasionally. But it was often too expensive for me to fiddle with it in nature. Screwing the filter together to obtain further adding gradations is also fiddly. There are enough individual ND filters, but each time you had to change the filter again...

With this filter here, you basically trick the entire handling process. I hadn't even found out that there was such a thing. That's why I've included a small video so that you can see the function. Even though “only” ND2-32 is available here, you can still see what these products can do.
Especially for experimenting, a matter of seconds, sometimes using a different filter setting. With low filter strengths, the automatic camera is also sufficient and you can see the current shutter speed when adjusting the filter. In this way, soft water structures can be created with relatively bright light or soft clouds in the sky, etc.pp. I didn't really notice stray lights or reflections, but I'm reworking something like that on a PC anyway.

The price of this product is high, but considering that it covers several filters at once, it's not too bad. However, the general question is what kind of filters do you really need. I've had an ND8 and an ND1000 so far. Sometimes an ND 4000 would have been required (to safely create “deserted” objects/spaces).

However, I find the concept here really innovative and practical.

Anyone who likes photography knows what you use an ND filter for. Since my attention is the landscape photography I can not avoid working with such filters. I ordered this one from K&F for my full frame camera.

I was just tired of filling my backpack with ND filters of different strengths. So the Nano-X Pro came in handy. To use it on several lenses I ordered it in the size 77 mm. I then work with step up rings to be able to use it on smaller lenses.

To say it right away: The optical quality and the quality of the images has flashed me! The workmanship is excellent and very successful. The lens thread is top clean cut.
The filter is adjustable from ND 2 to ND 32. The larger steps (f stops) are marked on the ring and easy to read. It can also only be turned in this range of 1-5. Below or above it does not work. So you always know by the stop what you have set.

The 77 mm. Ring brings 93 gr. on my kitchen scales. Everything is solid and feels very good. The setting runs well with slight resistance. So it should be.

The optical quality is absolutely flawless and even in difficult lighting conditions the filter delivers top. Chromatic aberration or color gradients into the green, magenta or anywhere else I have not been able to determine even when pixel peeping. Even with foliage or firs in backlight and with reflections from dew, the quality of the filter is unsurpassed. Finally a ND filter that does justice to my limited lenses and the full-frame sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. So you can use the filter on wide angle lenses without edge shading.

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

Conclusion:
K&F Concept has delivered a top filter here. What good is it if you put thousands into lenses but then bad filters make the work difficult or lead to lousy results? From me clear 5 stars+. I hope this is useful for your purchase decision. Also the price is relative because you save at least 4 ND filters.

I was always of the opinion that a cheap filter set was sufficient. After this filter, my opinion has completely changed. The quality of the filter is excellent. I really didn't think that was possible. You might notice - I'm totally flashed by this filter... It is excellent quality and workmanship. The controller is made of metal and here alone you can tell how good the processing is.

You also have to remember that the photo quality is affected by filters. This is not the case with the K&F filter! The highlight here is that I don't need tens of different replacement filters, but can always adjust them directly to the respective situation. Personally, I still lack the stronger gradations of up to 10 apertures. However, I'm really so excited about this filter that I'll see if this filter is still available in 6-10 f-stops. I would definitely buy myself, even though I've worked with cheap filters around 50 EUR so far. Quality comes at a price and in this case it's true! But you really get something on offer here for its price.

By the way, the filter sits well on the lens and I'm not afraid that I would lose it. It is very easy to use. The neutral density filter comes in a nice bag and is therefore very well protected.