The Canon 49mm Protect Filter is a general use, clear filter that helps to guard your lens from dust, scratches, moisture, and other elements. It is ideal for leaving on a lens at all times as it also helps to provide an additional level of assurance against accidental drops.\n\n- General protection filter reduces dust, moisture, and scratches from reaching lens elements.\n- Clear filter provides no additional coloration or contrast, allowing you to pair this filter with others.