The K&F Concept Nano-X Variable ND Filter has been an awesome addition to my photography gear. With a range of ND2 to ND400, I have the flexibility to adjust exposure in various light conditions without needing to constantly change filters. I’ve tried it out on several outdoor shoots and love how it allows me to control the effect on water or in the sky, giving me that professional touch I always look for in my landscape photos. The build quality is excellent, and the glass is very sharp – I haven’t noticed any vignetting or loss of detail, even at the highest density levels. Additionally, the rotation of the filter is very smooth, allowing me to fine-tune it without any issues. Another thing I’ve been pleasantly surprised by is how thin and lightweight it is. It doesn’t add any weight to my camera and takes up almost no space in my bag, so I can carry it everywhere without a second thought. I also appreciate the anti-reflective coating, which really helps reduce flare and improve contrast, especially in bright conditions. In summary, I highly recommend the K&F Nano-X filter to anyone who wants quality, control and flexibility in their photos. It is an essential tool for any outdoor photographer looking to take their images to the next level. Very pleased with this purchase!