The Sigma WR 52mm protective filter is a clear general-purpose protection filter, designed to be left on the lens permanently. This filter helps reduce dust, dirt and moisture that could reach the front lens element of your lens and provides additional protection in case of drops or situations where scratches might occur. This Sigma WR protective filter features a coating that repels water droplets and resists fingerprints. It is also treated to have antistatic properties to prevent microscopic dust from adhering to the front surface. This helps ensure sharp images. - Adds no additional colouration or contrast, allowing you to pair this filter with others - General protection filter reducing dust, dirt, moisture and scratches that could reach the front lens element - Made from glass that is resistant to water, oil and static charges