I'm really no expert when it comes to filters, but of the dozen or so I own this is far and away the highest quality. You can feel the build quality the moment you screw it to the lens. It's incredibly lightweight but doesn't feel at all flimsy, and the threading allows for super smooth application and removal.

I use polarizing filters more than any other as I live in a country that has near constant sunshine, so I've had plenty of chances to test this filter since I received it. The results have been just as good as I'd expect given the price. This thing beats the pants off my cheaper filters.

The CPL filter from K&F comes in such attractive packaging that you immediately realize you're holding a truly high-quality product. Inside the box, you'll find a classy case with a magnetic closure that protects the filter very well. This CPL filter is "slim," meaning thin, which has the minor drawback that it's a little harder to grip when rotating. Which brings us to my only minor criticism. Otherwise, you're getting a very high-quality CPL filter that brilliantly fulfills its purpose: reducing or preventing reflections, which makes photos appear richer in contrast and more color-interesting right from the start. There are limits to post-processing in this regard, and quite apart from that, it often saves me the need for post-processing because the photos simply come out of the camera more harmonious and without appearing artificial. The quality is impeccable, the filter itself is very high quality. The image quality is flawless, with no color fringing or distortion. 5 stars for that. In my opinion, a highly recommended filter!

Is all polarizing filter the same? No, that's not the case. Polarizing filters do polarize to a greater or lesser extent. This reflects the price you're paying for them. But there are other things as well: A really good filter doesn't have a light metal mount, as this could twist under pressure when screwing in, causing the filter to seize up. This polarizing filter has a heavy and precisely crafted brass mount, and the rotating ring for adjusting the polarizing filter to the correct position rotates smoothly and effortlessly. Additional ridges on the mount prevent fingers from slipping when turning. This is desperately needed, as the filter is designed as a "slim version" with a very short aperture to also be suitable for wide-angle lenses. The filter's coating looks impressive, and I'm inclined to believe it's particularly effective at preventing reflections (although this could only be truly proven in a comparison test). The polarizing effect is very good, and no color deviation is discernible in Lightroom. I've never owned a photographic filter that was so elaborately packaged—indeed, almost "staged"—as this professional filter from the Chinese manufacturer Shenzen Zhuo Er. The manufacturer wants to underscore its claim to be at the forefront of its market segment. I readily believe that it can do this. The filter's manufacturing quality easily rivals any Heliopan or Rodenstock filter. Of course, it also costs accordingly. I'd happily purchase a few more filters of this type—I've acquired a taste for them. Do you automatically take better pictures by using such an expensive filter? Absolutely not. If you've been satisfied with your image results so far, this filter won't open up a "completely new world" for you. But if you're eager for every technical possibility of improving quality, then, yes, then you should really consider switching to these fantastic filters.

As soon as you unpack it, you notice that this filter is of very high quality, as it comes in high-quality hard cardboard packaging. A very stylish and practical case is also included. The filter itself also looks super high-quality, scratch-resistant and works wonderfully!
It is very easy to screw onto the lens and also rotate it, although this is a bit difficult. But that doesn't mean it slipping either!
The price is quite high, but anyone who is willing to pay that much will have an absolute top product!

You can tell immediately upon unpacking that this filter is very high-quality, as it comes in high-quality hard cardboard packaging. It also comes with a very stylish and practical case. The filter itself also appears to be of extremely high quality, scratch-resistant, and works wonderfully! It screws onto the lens very easily and also rotates, although this is a bit stiff. This prevents it from slipping! The price is quite high, but if you're willing to pay that much, you'll get an absolutely top-notch product!

I've used ND filters from K&F in the past, so I wasn't surprised by the quality compared to newbies. The filters allow sharp focus without restrictions. Thanks to the really extremely thin glass and the thin frame, there is no cloudiness or dark spots at the edges.

The frame has small brackets so that if you want to readjust it, you don't have fingers in the picture.

The whole thing is rounded off by a nice leather storage pouch. Overall, absolutely great!

What you have to give the filter credit for right from the start are its optical properties! Regardless of whether you're photographing/filming cars in the automotive sector and have to contend with reflections in the windshield, or landscapes are more your thing: The K&F filter fulfills exactly what I expect from a CPL, and without any unwanted side effects. Sure, the price is pretty high for a "normal" screw-in filter, but it also scores points with build quality that's appropriate for the price segment. When turning, the filter rotates smoothly and, in my opinion, with a pleasant resistance. (I really don't understand the criticism of many others here, or would you rather have a filter that constantly gets accidentally adjusted because it's so smooth?!) If you don't have a case for your filters, it's also a nice bonus that the K&F comes with one, which is also really classy. Magnetic snap closure, strap to let the filter slide out of the case without getting fingerprints on it - really nicely done!

I am a Professional Home and Personal Chef and I also teach cooking both in videos, directly online and in live streams. I am also an online influencer, Vlogger and commentator. As such, my needs are extensive and many when it comes to cameras, microphones, mixers, input devices to computers, studio, lighting & editing equipment, as well as various control apps. I am picky and critical in reviewing and care little about brand names or product claims. If they are good, I will praise and recommend them, and if not, I will fully explain my reasoning for saying so. Honesty is my reviewing policy!

I have become a big fan of K&F and their filters. Even their lower-end filters perform brilliantly, but THIS one takes the cake! It's an absolutely superb filter that I would not hesitate to put against the most expensive high-end German filters than cost more the double the price!

The 36 multi-layer NANO-X coating is very evident in the quality of polarized images it produces. The threads on the filter are micro-fine and screw into a lens without any issues whatsoever. The circular adjustment is smooth as silk and effortless.

For me, this is a very versatile CPL lens at 67mm that many of my Sony, Sigma, and virtually all of my Tamron lenses use! I have tested mounting and removal on every compatible lens with a single issue.

This is the highest quality level of K&F Filters (NANO-X PRO). It comes with a 2-year warranty, and a manual is available online. They add a Microfiber cleaning cloth in a sealed pouch in the box as a nice bonus. Thoughtful!

The filter comes secured in a VERY nice faux leather overlap storage pouch. Clearly well thought-out.
Don't be put off by its Chinese Manufacture! It is super high-end and exceptionally well designed and produced. The company has won a number of INTERNATIONAL awards for design and their patented products are available in 56 countries.

This is truly an amazing filter for the price offered on K&F Concept. It is clearly the BEST CPL filter I have ever used over the years...including those from well-known and very expensive German manufacturers.
The filter and the inclusions rate an unequivocal STRONG FIVE STAR rating from me, along with my honest and VERY hearty recommendation! You cannot go wrong with this filter if you need a CPL!
Simply SUPERB!
Happy Shooting!

Transparency note: The product was provided to me free of charge as a review sample, free from any influence or expectations. My review is based solely on my personal assessment and experience with the product. Review: For those quick readers, I'll give you my review first. Below I'll explain the details of my decision-making process and my impressions of the product. I'll deduct only a minimal point and award 5 stars, rounded up to 5 stars. My only criticism is that the filter is a bit stiff to turn, i.e., its operation when screwed onto the lens. I hope this improves over time. No, it's not stiff to turn, but it is a bit stiff; I expected a somewhat smoother movement. Build quality: The slim frame is of very good quality, precisely crafted and painted. I appreciate slim filters; they sit lower on the lens and therefore don't limit its viewing angle, especially with the wide-angle lens. Slim filters can have the disadvantage of being difficult to handle because the grip ring is very thin. It's helpful to have a non-slip grip, and that's exactly what the K&F filter is. I can grip the filter very well and see without any problems even with wet fingers. The glass in the filter is very high quality: optical glass, very precisely crafted and completely flat, and also multi-coated. First, hold the filter in your hand and look through it, preferably against strong contrasts and straight lines, such as a facade. Here you can see that you see no interference. I detect no distortion whatsoever; the image is completely flat across the entire surface of the filter, and I also see no color distortions; I'm very satisfied. It's no different when I screw the filter onto my lens, but here comes another aspect: possible reflections, which are precisely what a polarizing filter is supposed to eliminate. In terms of the image effect, this is absolutely undeniable, be it on water surfaces or on windows; reflections are suppressed very well, as expected. But there's another aspect, and that's the reflections on and behind the filter towards the lens when backlight from small point light sources hits it at an acute angle. I didn't observe any reflections here, which speaks for the filter's very good coating and glass quality. I was very pleasantly surprised by the filter's packaging, starting with the attractive outer packaging in a high-quality slipcase. Inside is a folding case with a magnetic closure; it's very stylish and practical, significantly higher quality and more elegant than the widely used plastic boxes. Conclusion: At just under €150, the K&F polarizing filter isn't exactly a bargain, but it is reasonably priced in the truest sense of the word and clearly positioned in the premium segment. The build quality itself is just as impeccable as the optical imaging performance of the lens. The included case is very attractive. Only the somewhat stiff adjustment of the alignment slightly detracts from the overall impression, so I deduct half a star for that. In the overall impression, this plays only a minor role and leads me to an almost unconditional recommendation to buy. Thank you for your attention in reading my review. If you'd like, please feel free to give me feedback; I'd be delighted to hear it.

I used this for an Iceland trip and was able to capture some phenomenal images when it was on my glass (primarily a Tamron 28-75mm f/2.8 with a Sony a7ii).

The ring itself is a little stiff, but that's great for a polarizer - means you have one less thing to worry about when framing your shot in that this won't turn a few degrees on you. In terms of negative impacts to image quality, I can't notice many but I'm not exactly a pixel peeper.

For my uses, this fit the bill!