Hoya 55mm Yellow K2 Filter Y(K2) for Black and White Film

Hoya 55mm Y(K2) Yellow Lens Filter Made in Japan. This is a classic yellow contrast filter for black and white film photography, ideal for darkening blue skies, enhancing cloud definition, and improving tonal separation in outdoor scenes. The Y(K2) designation indicates a moderate yellow filtration with a filter factor of 2x, requiring approximately 1 stop of exposure compensation. Filter threads into standard 55mm lenses. Marked HOYA 55mm Y(K2) JAPAN on the aluminum ring. Glass is clean and clear with no scratches, haze, or fungus noted. Ring shows minor age-appropriate wear. Includes the original Hoya snap-lock plastic case with embossed Factor Guide chart on reverse listing UV(0), Y(K2), O(G), R(25A), G(X1), Skylight(1A), and multiple daylight/tungsten conversion filters. Case lid is present. A functional, quality vintage filter ready for use.