Multi-coated optical glass for enhanced optical resolution. FILTER UV: Protects your camera's lens from scratches, dust, dirt, moisture, and fingerprints, while reducing unwanted ulra-violet light. FILTER FD: The F-DL fluorescent light correction filter gives true-to-life color rendition by removing the harsh yellow-green cast FILTER PL: Polarizers let you achieve vibrant color saturation. When shooting under natural light, a fluorescent filter dramatically increases color saturation of subjects. The filter can be rotated to determine the amount of reflection to be removed. Reduces or eliminates glare and reflections from non-metallic objects and glass surfaces, and minimize haze.