Mounted on a 55-210mm from the Sony a6400 kit. In general, these are filters that are not easy to use for beginners like me. You have to understand where the light comes from and look in the viewfinder for modifications. For this one, the adjustment ring is small. For the price, it is an acceptable compromise, I can do it with big fingers. Important, it is not easily compatible with the lens hood. I installed it without the lens hood and then it was impossible to put it in place. There is surely a possibility by putting the lens hood in place and then the filter at the cost of fingerprints on the filter. I have not tried it. It is a good filter to discover polarization and its usefulness on a mid-range body and lens.

Arrived next day. Fits perfectly on my Canon camera no issue like some have said with screwing it on and off. The dial maybe a little stiff to turn but don't find it too be an issue. No issue putting it on nor taking it off my camera. Can't wait to test its effects and learn to get the best out of it before we go away...

So I rarely use a polarizer filter but I keep telling myself that I should be and I need to learn how to use it. I was hesitant to spend a ton a money on a filter I may not like from trusted name brand filters I prefer but at the same time I hated the idea of using some cheap quality less than $20 filter because they usually don't work or have issues.When K&F offered this lens I had to get my hands on one of them. K&F isn't a top premium brand, but they offer a good quality budget friendly beginner filters that are good quality lenses and features that some premium branded filters have but cost a lot more.As to this filter its a great quality filter, its a basic multi coated (they offer a more expensive filter with more features that professional photographers may need). I haven't seen any quality issues or issues with images from the camera. My camera has some sensor issues in low light. Images sometimes have a lot of noise (when the settings say they shouldn't).The picture I took are with the filter after some post editing to correct the noise issues and brighten up the picture (polarizing lens will darken images if you do not adjust settings, and still may darken anyways. It generally can be corrected in post)I haven't really had the chance to use the filter during a day when it was bright and sunny and in the right position for the best pictures. But the filter does a great job at blocking glare on cloudy days.The only issue I have is the lens attracts dust. I have to use a rocket blower, lens pen or microfiber cloth every few minutes to remove dust.This a great filter for beginners and the average user but if you are professional with a bigger budget, I would look for a professional filter.

Glass Glass Glass. It is all about the glass quality. Most often the filters you get in packages with lenses, etc, can simply be thrown away.This filter by K&F is surprisingly nice, even after being skeptical of the price tag of under $18!Was able to put it to use on a photo job immediately after receiving the package.Filter is well packaged and was inside a plastic sleeve, inside a plastic case, inside an outside cardboard box.The case is certainly good enough protection. You may want to put a label on the filter case as I did to quickly find the case. Unlike Hoya and some other filters, the re-useable case here do not have any markings on them. You can keep it in the cardboard box but it takes an extra step for me to take it out.The threads are surprisingly good, despite not being brass. Had no issues threading it on step up rings for various lenses. The glass is also nice with no imperfections upon receiving it.I wish some of my more expensive filters came in as good of a shape.