The Sigma 105mm WR protective filter is a versatile clear protection filter designed to remain permanently on the lens. This filter helps reduce dust, dirt and moisture that could reach the front lens element and offers additional protection in the event of drops or situations where scratches could occur. This Sigma WR protective filter is treated to repel water droplets and resist fingerprints. It is also treated to exhibit antistatic properties to prevent microscopic dust from adhering to the front surface. This helps ensure sharp images. - Provides no additional colouration or contrast, allowing you to pair this filter with others - General protection filter that reduces dust, dirt, moisture and scratches that can reach the front lens element - Made from water, oil and static electricity resistant glass