The abbreviation UX stands for "User Experience" and follows the motto of designing the UX filters to be as user-friendly as possible. For the first time, the ultra-slim filters feature an HMC WR (High Multi Coated Water Repellent) coating, which causes water to bead off and makes it easier to remove dirt. The new UX series has expanded the previous coating to include two additional WR coating layers on both sides of the glass. The new 10-layer coating on both sides of the filter glass also ensures reliable reflection suppression. The glass of both filters is held by a new, very thin aluminum frame, which prevents vignetting on wide-angle and ultra-wide-angle lenses. The Hoya UX CIR-PL filter eliminates distracting reflections on non-metallic surfaces. The effect of the Hoya UX CIR-PL filter can be adjusted continuously via its rotating ring. With circular polarizers, photographers can achieve creative, in-camera effects that are no longer possible after the image is taken. By rotating the ultra-smooth filter, you can select just the right amount of filtration needed for the desired creative effect.