This tool is especially designed for eyepiece projection or prime focus photography. A high quality T-Ring vital to ensure the film plane that is square to the optical axis. This T-rings accomplish that while minimizing any flexure. It is used to attach a digital camera body to a camera adapter for photography through a Vixen Optics telescope.
Also Vixen Optics T-Rings can be used for astrophotography in conjunction with other prime focus or eyepiece projection adapters.