Transparency notice:
The product was made available to me free of charge as an evaluation sample, free of any influence or expectations. My review is based solely on my personal assessment and experience of using the product.

Review:
For quick readers, I'll preface my review, below I'll explain the details of my decision making, my impressions of the product.

I only make a minimal deduction of points and award 5 stars, i.e. 5 stars rounded up.

My only criticism is that the filter rotates slightly too slowly, i.e. its operation when it is screwed onto the lens, but I hope that will subside a bit over time. No, the turn isn't slow, but it's a bit tough, I expect a slightly smoother movement here.

Workmanship:
The slim frame is of very good quality, precisely processed and painted. I like slim filters, they build up less high on the lens and therefore do not limit its viewing angle, especially with a strong wide angle.

Slim filters can have the disadvantage of being more difficult to handle, as the grip ring is very thin. It is helpful here if it is handy and that is exactly what the K&F filter is.

I can grasp the filter very well and see no problem even with wet fingers.

The glass in the filter is of very high quality, optical glass, very precisely processed and absolutely flat, and has also been coated several times.

First, pick up the filter and look through it, preferably against strong contrasts and straight lines, such as a façade.

Here you can see that you don't see any glitches. I don't notice any distortion, the image is absolutely flat, over the entire surface of the filter, and I don't see any color distortions, I'm very satisfied.

It looks no different when I screw the filter onto my lens, but here is another aspect, possible reflections, but that is exactly what a polarization filter is supposed to eliminate.

In terms of image effect, this is absolutely undisputed, whether on a water surface or on windows, reflections are suppressed very well, as expected. But there is another aspect and that is the reflections on and behind the filter towards the lens when backlight comes in at an acute angle due to small punctual light sources. I don't see any reflections here, which speaks for the very good coating and glass quality of the filter.

I am very pleasantly surprised by the packaging of the filter and that starts with the attractive outer packaging in a high-quality slipcase.

It contains a flip case with magnetic closure, it is very decorative and practical, much higher quality and more elegant than the commonly used plastic boxes.

Conclusion: The K&F polarizing filter is not
a bargain at just under €150, but it is inexpensive in the sense of the word and is clearly placed in the premium segment. The processing quality itself is just as impeccable as the optical imaging performance on the lens. The included case is very attractive.

Only the somewhat slow adjustment of the orientation minimally disturbs the overall impression, so I subtract half a star for this. In the overall impression, this only plays a subordinate role and leads me to an almost unrestricted purchase recommendation.

Thank you so much for your attention when reading my review. If you'd like, feel free to give me some feedback, I'd be happy to hear from you.

K&F has always been known as a company that produces fairly inexpensive gear that performs "good enough" for most non-professional situations. With this filter, it appears K&F is going after the professional shooters. The optical quality of this filter is fantastic. I had zero glaring issues when using this outside which is something I usually run into with budget filters. There was very little color cast even when using at the higher strengths. It comes with just a fantastic high quality case. I hope to see more filters like this from K&F. I am a big fan of really high quality gear which it seems K&F is starting to produce now.

really love the uses for portraits and remove reflected from skin, especially darker Melanated skin. I keep Polaroid and Kate in my bag at all times and it's polarizing filter easily. The best one I ever got doesn't stick like other ones in my kit sometimes they stick to my lenses don't have a hard time removing it. This one is very easy to remove, and the focusing or rendering of the polarizing filter is Very smooth.

Polarizing filter 43 mm. Excellent in terms of screwing / unscrewing. The thread is really well made. I find the polarization excellent, very balanced. Excellent case, quality. The price is worth the product

The excellent selection of lens filters has turned me into a dedicated K&F fanboy. A few weeks ago, I also purchased a camera backpack and a softbox from their extensive range...so far, everything has been top-notch. This polarizing filter fits seamlessly into this chain of experiences. The workmanship is first-class, the coating is high-quality, and the filter can be positioned precisely, even if it feels like it requires a bit more force when turning than older filters...with this product, K&F has finally ascended to the elite of photo accessory providers. Criticism at a very high level - a slight blue tint takes away some of the warmth from the photos, but you can fix that in post with a click. As always...5 stars for the K&F product.

I recently purchased the K&F Concept 67mm Circular Polarizers Filter Super Slim with 36 Multi-Layer Coatings and I'm so impressed. It's amazing how much of a difference this filter makes to my photos - in terms of clarity, sharpness and colour vibrancy. It's super slim, yet incredibly strong and durable. I love the 36 multi-layer coatings which give me amazing results every time. The images are crystal clear, thanks to the high definition coating. The colors come out vibrant and the polarizing effects are stunning.

The filter comes very well packaged in a box that can be converted into a picture frame. It is actually stored in a very high-quality leather case with a side "ejection strap," so you don't have to poke your fingers into the filter disc when removing it. The filter and its mechanism are very exquisitely crafted; despite its compact ("Slim") dimensions, the filter thread can be easily screwed in without any scraping noises or frequent attempts to attach it. Once tightened, it can also be loosened again with moderate force, provided the internal thread of the lens is undamaged and of the same high quality. The ridged areas of the inner ring are really helpful here, as you don't slip along the filter! The "glass" of the Nano-X Pro series should be beyond reproach and be among the highest quality in terms of quality and workmanship. Of course, it's generally difficult to check this in detail as a "normal photographer," and it's even more difficult with polarizing filters, but as expected, it doesn't make any obvious mistakes. On the contrary, polarization can be easily adjusted and achieves the expected effects, such as the classic anti-reflective coating of surfaces/glasses or the improvement of the color impression of the sky or water, etc. Conclusion: High-quality, compact CPL filter, which, when used correctly, continues to be helpful in noticeably improving the result of the images, despite modern post-processing methods.

The K&F filter is great because it does exactly what it's supposed to without noticeably altering the image or the colors. The ring rotates smoothly and precisely with a little resistance, which was particularly important to me. I don't see any noticeable difference in the colors in the image. The polarization also works, of course, which makes it easy to reduce reflections on windows or water surfaces. The included little bag protects the lens well from scratches and dents if you're often on the go with a lot of equipment in your camera backpack. I definitely recommend it.

I remember about 10 years ago when filters of this quality were the price of a lens If you have a high resolution camera like 30mp+ and a sharp lens, I def. recommend you to use this filter, the best value I could find!

Very high performance