The Sigma 82mm WR Protective Filter is a clear general-purpose protection filter designed to be left on the lens at all times. This filter helps to reduce dust, dirt, and moisture that could reach the front element of your lens and provides additional protection in case of drops or situations where scratches might occur.nnnThis 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.nnnn- Adds no additional coloration or contrast, allowing you to pair this filter with othersnnn- General protection filter that reduces dust, dirt, moisture, and scratches from reaching the front lens elementnnn- Made from water, oil, and static electricity resistant glass