This filter is for astrophotography and nightscape photography, effectively cutting "light pollution" from lights like sodium and mercury lamps. It cuts only specific wavelengths of light, allowing you to capture the natural colors of the night sky. No restrictions on lens use. Thin-frame design allows use with wide-angle lenses. Recommended for use with soft filters, etc. Filter diameter: 67mm Made in Japan, for peace of mind and reliability. There is a little dust on the filter, but no scratches. Please understand this is based on a visual inspection.