Here you get a really usable CPL filter for a relatively low price. I already have a CPL from the Nano X series from K&F Concept, the magnetic version of which is about twice as expensive. At least as far as the optical properties are concerned, I couldn't see any differences. I had problems with reflections in bright lights with a very cheap CPL from another brand. There was no sign of this with the K&F filter from the Nano K series. The workmanship of the filter is convincing, the thread runs smoothly, the rotating ring offers enough resistance so that it cannot twist on its own. The supplied accessories such as the lens cap with lanyard and microfiber cloth also impressed me in terms of workmanship. It is a bit annoying that the plastic box is unfortunately too big for the filter and does not contain any padding. A Nano X filter is supplied with appropriate padding. So the filter naturally rattles wildly back and forth in the box. Overall, however, a convincing CPL for a beginner-friendly price. Of course, you can only make better statements about the properties and durability of the coating after longer use. The occasional user should be well advised with this article. My rating: 5 stars - perfect product Transparency: I was given this article free of charge for a product test. However, this does not influence my rating. It is just as honest and critical as with the items I paid for. I have not carried out a professional product test here, but am rating the product as a normal consumer.