The Rokinon Slim Multi-Coated UV Filter absorbs ultra-violet rays which can cause outdoor photos to appear hazy and indistinct. It improves clarity and color balance, and provides brilliant images without any disturbing blue tint. The Rokinon Slim UV is a scratch resistant multi-purpose fine weather filter for digital and film based cameras, and may be permanently mounted to protect the lens against damage, scratches and debris. This UV filter is also multi-coated to provide an average light transmission of over 97% for sharp, vivid and well balanced color.