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 Amazon. 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!