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 ... a 46mm to 49mm step up ring. Specification of our adapter ring as follow: *M25,27,28,30,30.5,34 ...