The Sigma 72mm WR protection filter is a clear, versatile protection filter designed to be left permanently on the lens. This filter helps 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 could occur. This Sigma WR protection filter is treated to repel water droplets and resist fingerprints. It is also treated to exhibit antistatic properties that prevent microscopic dust from adhering to the front surface. This helps ensure sharp images. - Adds no additional colouring or contrast, allowing you to pair this filter with others - General protection filter reducing dust, dirt, moisture and scratches that can reach the front element - Made from water, oil and static charge resistant glass