Circular variable neutral-density filters are useful in systems where light intensity must be continuously varied. These holders let the user easily mount a CVI Melles Griot circular variable filter and rotate it to vary the transmitted intensity. The holder consists of two assemblies: the outer knurled ring and the central hub. The outer ring allows one to rotate the filter without touching the optic. The central hub holds the filter securely while allowing rotation about its axis. A magnetic system allows firm yet easy adjustment with positive retention of the selected angle. A 12-mm diameter post attached to the hub enables easy mounting to any post system using a post connector and a mounting post.