Convert your Star-Trail or Mini series matte box opening to fit 80 and 85mm lenses using this Clamp-On Matte Box Adapter Ring Set from SmallRig. Two clamp-on adapter rings are included in the set, both compatible with 95mm matte boxes. One accommodates lenses 80mm in diameter, and the other lenses 85mm in diameter. They are both designed with quick release transitions in mind for easy on-and-off.