The Sigma 95 mm WR protection filter is a versatile clear protection filter designed to remain permanently on a lens. This filter helps reduce dust, dirt and moisture that could reach the front element of your lens and provides additional protection in the event 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 have 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 could reach the front element of the lens - Made from water, oil and static electricity resistant glass