The Haida ProII Multi-Coating UV Filter is a premium optical filter that helps reduce ultraviolet (UV) light, which can cause haziness or a blueish cast in your photos, especially in high-altitude or coastal environments. With its advanced multi-coating technology, it improves image clarity and contrast while protecting your lens from potential damage. This filter is specifically designed for lenses with a 112mm filter thread, making it perfect for large-format lenses typically used in wide-angle photography.