Feature●ONLY FOR REVORING SERIES: RevoRing ND3-1000, RevoRing VND&CPL, RevoRing CPL, RevoRing Black Promist, RevoRing White Promist●FUNCTION: Due to the optical refraction principle of wide-angle lenses, using variable ND filter may create a X cross pattern. In such cases, it is necessary to stack a RevoRing circular magnetic ND filter to meet the demands of higher stops●RevoRing ND16: From 1-5 stops change to 5-10 stopsDescription H&Y RevoRing 67-82mm ND16 Magnetic Filter x1