The Tiffen Skylight 1-A 127 mm Filter is a general-purpose filter with a slight pink tint to enhance overall colour accuracy and clarity. The light pink colouration helps reduce the overall blue cast of daylight and is particularly effective for landscape and shade photography. The Sky 1A filter is also useful as a general protective filter to be left permanently on lenses. Filters help reduce dust and moisture that could reach your lens element and provide additional protection in case of drops or situations where scratches could occur. Tiffen filters are manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, polishing it flat to a tolerance of one ten-thousandth of an inch, and then mounting it on precision metal rings. Helps enhance overall colour accuracy and clarity when shooting outdoors in daylight and shade. Light pink tint reduces the blue cast of natural light. General protective filter reducing dust, moisture, and scratches that could reach lens elements.