The Hoya 49mm alpha MC UV Filter is a general use, clear filter that helps to absorb ultraviolet light. No additional coloration or contrast is provided, allowing you to pair this filter with others. The UV filter is also useful as a general protective filter to leave on lenses at all times. Filters help to reduce dust and moisture from reaching your lens element and provide additional protection in case of drops or situations where scratching could occur. Hoya alpha UV filters are multi-coated for reducing flare, ghosting, and reflections on the filter surface. As a result, a higher light transmission of approximately 96% is possible, providing you with additional contrast and high color fidelity. The alpha filters are constructed from optical glass and a precision milled aluminum frame.