The iSnapPhoto HD MC UV Protective Filter for Canon RF 200-800mm F6.3-9 IS USM Super Telephoto Lens (6263C002) is a a strong glass clear filter that helps absorb ultraviolet light. No additional coloration or contrast is provided, allowing you to pair this filter with others.The UV filter is useful as a general protective filter to leave on lenses at all times. It helps to reduce dust and moisture from reaching your lens element and provide additional protection in case of drops or situations where scratching may occur.This filter is High Definition (HD) And Multi-Coated (MC) for reducing flare, ghosting, and reflections on the filter surface. Over 97% light transmission is possible, providing you with additional contrast and high color fidelity.5 year warranty