The package containing the K&F Concept Nano X-Series Variable ND Filter ND3-ND1000 Neutral Density Filter 67mm (1.5-10 f-stops) was delivered quickly and securely packaged. I love photography and was delighted to be able to test this filter. The black outer box containing the filter was covered with a plastic film to prevent any moisture from penetrating. The filter itself comes in a high-quality plastic case. The flap of the case is magnetic, so there's no unnecessary fiddling around to get to the filter. Very practical: The filter can be easily lifted out using a strap. The whole thing looks really classy and would also make a great gift for an amateur photographer. The filter itself is made of Japanese optical glass with a 28-layer nano-coating on both sides, which is supposed to prevent a certain amount of lens reflection and, of course, glare from various light sources. According to the manufacturer, the ND filter is waterproof, oil-proof, and dustproof, which is particularly useful in nature and when hiking. I have the feeling that the filter is very robust. It weighs 45 g with a 67 mm lens. Of course, the price is correspondingly reasonable. The filter frame is made of aircraft-grade aluminum, has an ultra-wide-angle design, and is just 7.4 mm thick. Anyone like me who has always used several different darker neutral density filters will appreciate the fact that they only need one filter. I use neutral density filters primarily for photographs of water by a lake, flowing water, or waterfalls. They are also fantastic for long-exposure shots of places where you would like to photograph without people. The function of this adjustable filter is quite simple. Operate the practical slider, and the filter darkens or brightens as needed (see photos). This makes it easy to try out different settings and effects without having to constantly change filters. However, I must also mention that you can't attach the lens hood to this filter because the slider gets in the way. It's a bit impractical, but hey, you can't have everything... Conclusion: The price is within the normal range for this type of aperture adjustability. Sure, there are cheaper options, but the K&F filter is built with a somewhat higher quality. The results are certainly impressive. Since I'm not a professional but simply enjoy photography, this filter is actually a great companion for me and I can recommend it with a clear conscience. As a product tester, I study each product I test very intensively, putting it through its paces, so to speak, and only give reviews that I can fully stand behind. I hope my review was helpful to you.