Professional High Definition 77mm Clear Digital Ultra Violet UV Filter for Canon EF-S 17-55mm f-2.8 is USM

This High Definition UV Filter is a general use, clear filter that helps to absorb ultraviolet light and reduce the bluish cast of daylight. 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. Absorbs Ultraviolet Light Reduces Bluish Cast of Daylight General Protective Filter Optical Glass Construction Aluminum Filter Ring