Hoya YHDUV046 HD Super Multi-Coated 46mm UV Filter

The Hoya HD 46mm UV filter is the 46mm entry in Hoya's HD (High Density) line — a step above the standard Hoya HMC filters in both glass hardness and coating sophistication. The high-density sharp-cut UV glass is engineered to transmit the full visible spectrum cleanly while sharply cutting ultraviolet wavelengths, which reduces the haze and blue cast that open-sky shooting can introduce — an effect that's subtle on overcast days but visible on bright, high-altitude, or coastal shoots. Eight anti-reflective coating layers suppress the internal bouncing of light within the filter glass itself, which matters most when shooting into bright light sources where a lesser filter would add ghost images or reduce shadow detail. The high-pressure press mounting ensures the glass is bonded to the aluminum frame under tension rather than simply seated, which prevents the micro-play that makes cheaper filters rattle.

The 46mm thread size appears on a specific family of compact lenses — small-diameter primes and travel zooms on mirrorless systems, as well as certain older SLR lenses built for portability. On these lenses, the ultra-thin frame matters: a full-thickness filter frame would add visual bulk that defeats the purpose of a small lens, and on wide-angle examples could cause vignetting at the corners. The HD's slim profile avoids both problems while keeping the front element protected during the bag drops, rain showers, and impromptu beach shoots that compact travel systems inevitably encounter. For photographers who leave a UV filter on as permanent protection, the water and oil repellent coating is a practical daily benefit — the glass stays cleaner longer and takes less effort to clean when it does get smudged.