T-adapter for connecting APS-C and smaller cameras to the EdgeHD 9.25, 11 and 14" optics This T-adapter allows you to attach your DSLR to the primary focus of your EdgeHD telescope. This allows you to use it for terrestrial photography and lunar and planetary photography with short exposure times. Deep-sky photography is also possible with a tracking control (guide scope). You need both this T-adapter and a T-ring to attach your camera to the telescope.