Specification of our adapter ring as follow: *M25,27,28,30,30.5, ... 58,62,67 to 72mm *M67,72,77 to 82mm Adapter ring is used between camera(or projector) and lenses,it ... telephot lens,wide angle lens,fisheye lens,and so on. Adapter rings are labeled from the camera to the filter. For ... with 25.5mm threads. The adapter will allow a 46mm filter (or other adapter ring) to fit. Adapter rings can be stacked. To ...