I've been a fan of K&F Concept for a long time and own many filters. Especially in the beginning, the affordable products were a real blessing for my wallet. I simply couldn't afford expensive polarizing filters, ND filters, or adapters. However, K&F Concept impressively demonstrates with this filter series that they can also produce absolutely high-quality products. I can report that just unpacking the filters is a real joy. While this doesn't directly count towards the rating, it immediately conveys a completely different feeling than with the brand's other product series. The case also features a very attractive and tactilely designed case, which allows you to remove the filter via a flap. But now to the filter itself. I've used several polarizing filters before, but none of them have impressed me as much as the Nano-X PRO. The workmanship is simply top-notch, the weight feels solid in the hand, and the thread is a joy to use—when screwing it on and even when unscrewing it again. Most people will be familiar with this: cheap filters tend to stay put. The optical performance, which is ultimately what matters, is superb. Reflections are skillfully filtered, and beyond that, there's no distortion of the actual image. The resulting look is simply superb. When a little magic is added in post-processing, photos of cars look simply amazing, on a completely different level. I can therefore recommend it without hesitation.