I use several K&F Concept filters for my lenses. They've always been great value for money and good quality filters and this polariser is no different. I use this on my Nikon primes and they go a long way to cutting out reflections without sacrificing picture quality.

I bought these for use on my Canon IS binoculars and they are perfect. The attached/leashed lens caps are perfect for my use on the water on boats. The conditions are usually bright and the filters cut the glare exactly as they are designed.

Learning car photography this tool it’s amazing help take reflection of the car love it

I have to say I’m impressed by the quality of this CPL. It’s priced right and gives you the most bang for your buck. If you like seeing the details in your photos without having them washed out due to harsh sunlight or are tired of recovering dark contrast in post, give this CPL a try. It’s made of high end glass and the coating is solid.

Glass is perfect, easy to use. Screws right in and does the job. 10/10

This is a very budget friendly filter. It comes with a lens cap, lanyard and a clean cloth. It fits perfectly on my fujifilm X100VI. The filter also does a good job on the sharpness and color on the photo.

I own a dozen or so filters from various manufacturers for my cameras. We all know that when you're looking for a filter, you will see offerings that run the gamut on pricing, and sometimes it's hard to tell the difference between an inexpensive product and one that costs more. The moment I received this filter, I knew it was special. Let's start with the packaging. Instead of being shipped in just a dinky box or plastic bag, this has a sturdy cardboard box with a metallic sheen. The outside is also completely printed with QR codes for info, specifications, etc. On the inside, you get a sturdy, transparent storage case that snaps close. Inside is the filter with a LENS CAP attached, as well as an orange lanyard. As a bonus, you will get a sealed cleaning cloth. I don't think I've ever purchased a filter that came with a cap retention lanyard and a lens cap before. I am using this for my Fuji X100V, and of course, it fits perfectly. I can use the included lens cap with any filter I decide to use. The only con I've found is that once you get this on and rotate clockwise a few times to get the right CPL effect, the threads are really tight. The threads are also so short that it's hard to get a grip on just that area to get them off. I had difficulty removing the filter from my camera and had to resort to a filter wrench. However, this is not unique to just this filter. All filters could have this problem with removal.

The CP filter is shipped in a nice plastic case with a lens cap and keeper. While I keep unused filters in a pouch, the cap comes in handy. I like to keep the cap on as an extra safety precaution. K&F also provides a microfiber cloth in the package.
The first thing I noticed was that the filter is thin and light weight. Visually, the threads appeared clean without any obvious imprefections. It threaded smoothly on to my 49 mm FujiFilm adaptor. Once in place, rotation of the polarizer was smooth with what I believe is a bit higher force than I would have liked. However, I find this preferable to a looser ring. Removal of the filter after use, as expected, was a bit more difficult, requiring a bit of force to start loosening it.
I drove to the coast on a sunny day and took a number of frames at various polarizer strength. When I got home I carefully inspected each photo and then compared them side by side. I may not be a professional but I am extremely critical of my work but could not find any unexpected changes in sharpness or color shifts.
In summary, nice filter at a great price.

I had dropped my camera on a hike, which did in my previous filter. Time for a replacement.
The slim frame is nicely done and the outer ring has sufficient grip to easily turn it, even with the dampening that is just about right. I hope the dampening doesn't end up being too much as the grease ages over the years. A couple of things about the slim frame: The filter is more difficult to remove than normal framed filters and my OEM lens cover no longer fits, since there is less thread on the outer filter.
So, there is an decent lens cover included with a tether. However, I have been unable to attach the tether to the lens cover, as it appears the intended hole in the lens cover for the tether does not go all the way through. At this point I'm undecided on how I'm going to resolve that issue.
Other than the lens cap, quality looks right on. The coating does make a tremendous difference compared to an uncoated filter.

Really nice lens filter. Appears to be of really good quality. No issues with it. Screws on well to my third party Fuji lens!