As someone that does a lot of automotive photography, having a polarizer helps a lot to get rid of some of the reflections of the car. Of course, there are numerous polarizers to choose from but I did not want to spend $100+ for a polarizer if a cheaper one could perform just as well.I used it with my Sigma 50mm 1.4 ART lens and I am very impressed with the capability. The circular polarizer is very well made, very sturdy and great at removing reflections off of cars (what I mainly used it for).Overall, if you are looking for a CPL for automotive photography, the K&F Concept does what it is intended to do. And, the best part is the price! It is very inexpensive compared to the other CPLs, such as B+W.

No complaints here. Good price for good glass. Don’t get any weird distortion or color. Good enough for me.

My first experience with the K&F Concept filters was with the purchase of a light pollution filter I've been happy with, particularly liking the grippy knurl added to the edges of the filter. After accidentally scratching my Hoya NXT Pls CPL 82mm filter which is more than double the cost of the K&F filter, I decided to purchase the K&F Nano Series CPL filter and see how I like it. Moreover, I also chose to go ahead and buy a 95mm version as well, to replace a Pro Optics (Adorama house brand) filter that I thought might be a lesser quality filter. Both K&F filters arrived today and a visual inspection of them reflects a quality product as I expected. However, one minor complaint is that I like the round K&F filter case which as a rigid plastic insert that appears to be grooved to support holding any of various sizes of filters securely in place in the case....that is, perhaps for a range of filter sizes, K&F may be using the same case to save manufacturing costs. However, while the 82mm filter arrived with that same case, the 95mm filter was in a more common, square plastic case with foam cutout to hold the filter. Still fully functional, just not as nice as the case provided for the 82mm filter. I don't expect to see any problems with the cheaper case, but it is the type that frequent use could find the plastic hinge wearing out eventually; I simply favor the 2-piece round case of the smaller filter.

As with every kf filter I’ve purchased, this one is of the highest quality. It’s almost impossibly thin, and well constructed in every way.

This is my first K&F filter and build quality is really good. It has a slim profile and the polarizing feel really smooth.

I've used Hoya filters B+W filters below, which are a bit expensive, but provide extraordinary image quality. This K&F filter offers similar picture quality to the Hoya, which is great, at a cheaper price. It also includes a "usable" filter holder that more expensive options don't include in the package.

All in all, excellent balance between price and quality

Brilliant value for money and the quality is excellent. Looks a lot more costly than it is. Images look excellent with no visible degrading of quality. Recommended.

Like most K&F filters I own, this CPL filter is very good. I don't notice any distortion or banding. It does tend to reduce shadow detail more than it does highlights. It does its job removing glare and deepeing blues. The adjustment ring is a little stiff, but it could just be because it's new. The case is huge - almost 1/2 again the size of the filter.
It does tend to get stuck on the lens. Since the inverted mouse pad trick won't work because of the adjustment ring, I've found that pushing (not pinching) on the adjustment ring with tumb and forefinger like you're pushing it towards the camera body, then giving an abrupt twist will loosen it (it may take a few tries)

Worth more than the price. Perfect.

Got all the DSLR stuff, but wanted a CPL for my bridge camera. Initially bought a cheap one because I wasn't sure how much I'd use it, especially for landscapes. However, the camera is so light and versatile that I find that I now use the DSLR very little, so I looked for upgraded filters for the bridge. The CPL is the most important, of course, so I tried this as a first go, and I've not been disappointed. Yes, I could spend a fortune on really good filters, but for an enthusiastic amateur of advancing years, this will do nicely. I have used it for a few weeks, and have been very pleasantly surprised at the results. Very good value.

I liked the fit.. I've bought top brand CPL filters and the fit was bad.. K&F 5 stars will be buying more for my other lenses