The abbreviation UX stands for "User Experience" and follows the motto to construct the UX filters as user-friendly as possible. For example, the coating has been significantly improved. For the first time, the ultra-flat filters feature an "HMC WR" (High Multi Coated Water repellent) coating that repels water and makes it easier to remove dirt. For the new UX series, the previous coating has been extended by two additional WR coating layers on both sides of the glass. This allows water to bead off immediately on contact with the glass without leaving any traces. In addition to this practical effect, the new coating also prevents streaks and fingerprints. The new 10x coating on both sides of the filter glass also ensures reliable reflection suppression. The glass of both filters is held by a new and very thin aluminum mount. This will prevent vignetting on wide-angle and super-wide-angle lenses. The Hoya UX CIR-PL filter removes disturbing reflections on non-metallic surfaces. The effect of the HOYA UX CIR-PL filter can be infinitely adjusted via its rotating ring. With circular polarizing filters, photographers can achieve creative, in-camera effects that are no longer possible after the image has been created. A polarizing filter filters unwanted reflections from non-metallic surfaces such as water or glass, as well as light that reflects moisture and pollution in the atmosphere. By rotating the ultra-smooth filter, you can select just the right amount of filtering needed for the creative effect. This results in a bluer sky, greener leaves, reduced or eliminated reflections, and increases the clarity of the final image.