This product works well. I expected better filtering, but that's okay. Looks very good quality. Super well packaged for transport. Received quickly.

It's a good product.

K&F a security

does the job

This is the first lens filter I have ever used. I've always read/heard that a good filter can make a significant difference, but until now I've never gotten one. This polarizing filter is very nice! The high-quality construction of glass and metal is easy to see. In my pictures you can see that the filter is attached to my camera, but I was able to attach my lens hood directly to the front of the filter. It has front pickup threads in addition to the rear threads. A really nice feature is that the front of this filter rotates freely. This way I can now easily rotate the tulip hood to the best position without the risk of the filter or hood loosening. I couldn't do that with the hood connected directly to the camera. But does the filter make a difference? I am happy to say that it works very well! I often take pictures through a window and it's very common for the picture to have some "haze" that wasn't there when I took the same picture outside. I took a picture through the window with this filter and was pleasantly surprised to see a picture that looked like I took it outside. I don't know exactly how this works, but it does. Just like polarized sunglasses, this filter "steers" the light in a way that enhances what you see. I am impressed!

This is the first lens filter I have ever used. I've always read/heard that a good filter can make a significant difference, but until now I've never gotten one. This polarizing filter is very nice! The high-quality construction of glass and metal is easy to see. In my pictures you can see that the filter is attached to my camera, but I was able to attach my lens hood directly to the front of the filter. It has front pickup threads in addition to the rear threads. A really nice feature is that the front of this filter rotates freely. This way I can now easily rotate the tulip hood to the best position without the risk of the filter or hood loosening. I couldn't do that with the hood connected directly to the camera. But does the filter make a difference? I am happy to say that it works very well! I often take pictures through a window and it's very common for the picture to have some "haze" that wasn't there when I took the same picture outside. I took a picture through the window with this filter and was pleasantly surprised to see a picture that looked like I took it outside. I don't know exactly how this works, but it does. Just like polarized sunglasses, this filter "steers" the light in a way that improves what you see. I am impressed!

Fast delivery, typical CPL packaging in the plastic box, nothing special until then. Very good anti-reflective coating without loss of sharpness with the CPL 55mm diameter D series. I've always lacked that little bit of sharpness, even that was remedied by, among other things, higher-contrast imaging. The picture uploaded here shows a 100% crop on the left without a filter and on the right with a filter. I was concerned here with the sharpness image, made with a Sony a7ii and a kit lens on 65mm with 1/100 f5.6 ISO 800. The second picture shows left without reflection and right with reflection. I didn't want to try if it was scratch resistant.

Everything I was missing

Everything perfect! I have nothing to complain about. Since I have read many reviews that criticize the detachment of the filter, I would now like to share my experiences in this regard: I have used the filter several times now and can say that the filter can be removed from the lens without any problems. If you feel the filter firmly and don't slam it shut without feeling, then it can be loosened again in the normal way.

I really love the K&F concept filters - they just work...every time. This CPL is both affordable and made from quality glass. There is no vignetting on my 18-140mm lens. And most importantly, there is no color shift like other CPL filters. The threads fit my camera's lens, and the adjustment ring offers just enough resistance to make adjustments smooth and comfortable. This is an excellent polarizer, you will not regret this purchase.