This is a great little filter combining both an ND and A CPL filter, they seem to work well together and I'm getting no x ing or other major colour shifts and for my line of work long exposure car photography this is ideal as I can use the ND to get some nice soft clouds with a longer exposure and get rid of all the cars reflections with the CPL, ideal for the genre in my humble opinion, the filter itself is great quality and feels very solid indeed, very happy with it.

After trying countless filters, this is the one that has given me the best results. I have not noticed any color variation or loss of sharpness, as I have noticed with other well-known brands, and I add that I have tried many different models.
The polarizing filter that this ND incorporates is essential for me, since when the ND creates a bit of a vignette at angular distances, I can correct it through the polarizer, and I also have total control over the reflections. The build quality is very robust and it looks great aesthetically.

The K&F Concept filter is delivered in very elaborate packaging together with a small bag and a vacuum-sealed cleaning cloth. The packaging also shows the importer's address in Frankfurt and the manufacturer's address in China. The origin is "Made in China".

The filter itself is, as I have come to expect from K&F filters, extremely well made. I bought the 49mm filter. I was very surprised when I unpacked the filter. It is a 67mm filter with a 67mm to 49mm adapter.
The filter is easy to screw on and it is also extremely easy to move for the polarizing filter function.

The bag is also well made. It has a "strap" in the bag to make it easy to get the filter out of the bag by pulling on the strap. The bag closes magnetically.

I have already made my first "attempts" with the filter, but so far I am still in the practice phase.

Conclusion:
The filter is well made and easy to handle. I give the filter a full 5 stars.

Very high build quality and optics, this is one of my favorite filters.
Easy to use and looks great, it's also a really nice range of ND for most lighting situations.
Threads are smooth too, and it goes on and off nice and easy.
Helps makes the quality of my videos look more pro!

I like using lens filters, including circular polarizers and variable ND filters, depending on what I am shooting. This filter combines both technologies into one convenient package, freeing up much-needed space in my camera bag.

I've been using this on my Sony FE PZ 16-35mm F4 G lens, and the results have been impressive. I've achieved silky waterfalls and smooth clouds while reducing sun glare and reflections with no noticeable degradation in image quality. This filter also speeds up my post-processing workflow.

The quality of this filter is exceptional! Far better than I expected. I've always been somewhat dubious of K&F Concept equipment as I see them as a generic Chinese brand (albeit decent), but this filter is spot on in terms of construction and glass quality.

There is an unfortunate negative to using this filter. You can't use a lens hood or lens cap. It's only a minor complaint, as I remove this filter when general shooting.

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.