The Sigma 58mm protection filter is a transparent general 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 the event of drops or situations where scratches could occur. – Produces no additional colouring or contrast, allowing you to combine this filter with others – The general protection filter reduces dust, dirt, moisture, and scratches that could reach the front element