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 filter●RevoRing ND400: From 1-5 stops change to 9-13 stopsDescription H&Y RevoRing 67-82mm ND400 Magnetic Filter x1