The package with the K&F Concept Nano X series variable ND filter ND3-ND1000 neutral density filter 67mm (1.5-10 aperture steps) was delivered quickly and securely packaged.
I love photography and was happy to be able to test this filter.
The black outer box with the filter was once again coated with a plastic film so that no moisture could penetrate. The filter itself is in a high-quality plastic case. The flap of the bag is magnetic. So no unnecessary flipping around to get to the filter. Very practical: The filter can be easily removed with a strap. The whole thing looks really elegant and is also a great gift for a hobby photographer.

The filter itself is made of Japanese optical glass with 28-layer nano-coating on both sides, which should prevent a certain lens reflection and, of course, glare caused by various types of lens. light sources. According to the manufacturer, the ND filter is waterproof, oil and dustproof, which benefits the requirements of nature and hiking in particular. I have the feeling that the filter is very robust. It weighs 45 g with a lens size of 67 mm. Of course, the price is appropriate accordingly.
The filter frame is made of aircraft aluminum, has an ultra-wide angle construction and is just 7.4 mm thick. Anyone who, like me, has always used a few different dark gray filters will appreciate this fact of only using 1 filter.
I use neutral density filters in particular when taking pictures of water at a lake or of running water or waterfalls. Even when taking long-term photos of places that you would like to photograph without people, this part is fantastic.
The function of this adjustable filter is quite simple. Press the practical slider and the filter becomes darker or lighter again as needed (see photos) So you can easily try out different settings and effects without having to constantly change the filters.
However, I also have to mention that you cannot attach the sun visor to this filter because the slider is of course in the way. It's a bit impractical, but okay, you can't have everything...
Conclusion: With this type of aperture adjustment, the price is within the normal range. There are certainly cheaper ones, but the K&F filter is built to a higher quality. The results are certainly impressive. Since I'm not a professional but simply enjoy taking pictures, this filter is actually a great companion for me and I can recommend it with a clear conscience.

As a product tester, I work very intensively on each product tested, put it through its paces, so to speak, and only give reviews that I can fully stand behind. I hope my review was useful to you.