The Rodenstock 72mm UV Multi-Coated HR Digital Filter is a wise investment. It can help protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs. If desired, it can be left on the lens at all times for protection. Designed for use with High Performance optics, Meets RoHS standards for environmental concerns. The filter is designed with a unique quality scratch resistant lotus leaf hardcoat to prevent abrasions and the effects of moisture, while providing a profession standard of light transmission necessary for high resolution imaging.