I have received the Polarizer today and tested directly. In the customer images, a comparison image can be seen that I have made with the help of my laptop screen. As you can see, the filter is vertically entirely impervious to the polarization direction, which speaks for its quality and impact. Parallel to Pol. direction hardly brightness loss can be recognized. Even apart from that I can not see any image quality degradation at my photos through the filter, so no color cast, or the like. The ring is made of metal and makes a strong impression, the filter glass can be easy, but not too easy to turn. The corrugated surface of the rotating ring facilitates handling. It seems as if you are dealing with a real stroke of luck. Buy recommendation!