Box contents:

- filter holder for 100 mm x 100 mm filter
- adapter ring 67 mm
- adapter ring 72 mm
- adapter ring 77 mm
- 82 mm adapter ring
- padded cardboard box for filter holder

The whole thing makes a very valuable impression overall.
The adapter rings are black anodized aluminum - they are well made, not sharp and the thread can be easily screwed onto the lenses.
In addition to the plastic filter cartridges, the filter holder is also made of black anodized aluminum. Here too, the treatment is excellent. Maybe the quality of the plastic inserts could be better, but this is already complaining at the highest level. The inserts fit all 100mm x 100mm filters with a thickness of 1mm to 2mm.
the packaging was impeccable; Adapters are individually packaged; The portafilter comes in a nice padded cardboard box.
Full points and recommendation for a perfect rectangular filter system at a significantly lower price than some other manufacturers.

For safe storage of three square filters 100 x 100 mm and a filter holder. The case seems sturdy and looks pretty good.

I carefully compared the technical data of most of the different endoscopic cameras offered here. I limited myself to the price range between 100 and 300 euros, as I will probably only need the device a few times a year, but of course I did not want to buy a toy. The device was delivered complete with all accessories in a semi-rigid soft case and makes a pretty good impression overall. After plugging in the camera, which is only 5 mm thick and mounted on an easily moldable 5 m long tube, and setting the date, time and language selection, the device was immediately ready for use.My first test setups were initially limited to the usual examinations of drain pipes, machine views, ventilation shafts and computer interiors or even searching for small parts under the cabinet. After a bit of practice and variations with LED illumination, quite good and, in the 30 to 100 mm range, very sharp images were achieved throughout. Of course, it remains to be seen how the part will test over a longer cycle of use.

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.

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

I just got tired of stuffing my backpack with ND filters of different strengths. That's where the Nano-X Pro came in. In order to use it on several lenses I ordered it in the size 77 mm. I then work with step rings to be able to use it on smaller lenses.

To say it straight away: the optical quality and the quality of the pictures flashed me! The processing is excellent and very successful. The lens thread is cut very cleanly.
The filter can be adjusted from ND 2 to ND 32. The larger levels (apertures) 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. So you always know what you have set at the stop.

The 77mm. Ring brings 93 gr. on my kitchen scale. Everything is solid and feels very good. The adjustment goes well with slight resistance. It should be so.

The optical quality is absolutely flawless and the filter delivers top quality even in difficult lighting conditions. I could not determine any chromatic aberrations or color gradients into green, magenta or anywhere else during pixel peeping. The quality of the filter is unsurpassed, even with backlit foliage or fir trees and reflections from dew. Finally an ND filter that does justice to my limited lenses and full frame sensor. The frame thickness with thread is only 9 mm. Without thread 0.63 mm. So you can also use the filter on wide-angle lenses without edge shadowing.

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's the point if you put thousands in lenses and then bad filters make the job difficult or give lousy results? Clear 5 stars+ from me. I hope this is helpful in your purchase decision. The price is also relative because you save at least 4 ND filters.

The filter is huge.
7.4mm thick and 159gr weight, designed probably more for outdoor use.
Multi coated surface (28 layers), filter made of glass, scratch resistant, waterproof,....

You get a shock when you hold it in your hand for the first time.
There is a scale in the front that shows the approximate values, all of this is easy to grip on the frame itself or adjustable with the small handle that is screwed on.

The filter rotates completely, i.e. at the end / ND1000 comes a tiny step before it goes up again. Because there is no stopper, you have to be quite precise to get the highest ND value.
Even though it is of course the common design of these filters, I don't find this particularly practical or easy to adjust. You really have to pay attention, the scale doesn't really help there because the highest effect comes after the ""1000ND"" entry. And a little bit of rotation further, the ND decreases again.

Optically everything is ok, I could not notice any major / disturbing color changes - at least nothing that one would not have expected with this type of filter.
With and without the filter, the image remains sharp.

The whole thing comes in a plastic bag, where the filter sits loosely inside, without any further cover - again, I'm rather the friend of the closable plastic covers, but ok.

For 80 euros you get a good tool at hand.
For me, not the optimum, but that is complaining at a high level.

Anyone who likes to take pictures knows what you use an ND filter for. Since my focus is landscape photography I can't help but work with such filters. I ordered this one from K&F for my full frame camera.

I was tired of filling my backpack with ND filters of different strengths. The Nano-X was just what I needed. I ordered it in the size 52 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 convinced me! The workmanship is excellent and very successful. The lens thread is top clean cut.
The filter is adjustable from ND 3 to ND 1000. The larger steps (f stops) are marked on the ring and easy to read. So you know what you have set.

The 52 mm. Filter brings 28 gr. on my kitchen scales. Everything is solid and feels very good. The setting runs well with slight resistance. This is how 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 fir trees 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 10 mm. Without thread 0.75 mm. So I can use the filter on wider angle lenses without edge shading.

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

Conclusion:
K&F Concept has delivered a top filter. What's the use of spending thousands on lenses, but then bad filters make 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 since you save at least 4 ND filters.

Very good