The Heliopan 55mm KR 3 (81B) Filter reduces blue casts in cloudy or shaded conditions by lowering the color temperature by about 100K, producing warmer, more natural tones. Made from high-quality German Schott glass with multi-coating to minimize reflections, it maintains sharp image clarity. Its durable, precision-cut brass frame offers a secure fit and resists damage, while the slim design prevents vignetting on wide-angle lenses. Expertly crafted and thoroughly inspected in Germany, this filter delivers reliable performance for refined photographic results.