The Nikon-T2-Ⅱ adapter is composed of a 29mm new Nikon-T2 adapter ring and a 5mm T2 extension tube. It is suitable for all ASI cameras except for full-frame models. Depending on the camera you are connecting, you can choose whether to use the 5mm T2 extension tube. This adapter also supports the connection of 2" IR-CUT filters.