T2 Ring, is an adapter to connect digtal DSLR body to telescope. This item is variable in different mount design for different make of DSLR cameras. No compatibility of EOS T2 ring with other maker. EOS T-Ring only works with Canon EOS series SLR cameras. Solidly built without internal screw ring and which is better for center axis with camera sensor.
48mm is mostly recommended for Canon EOS full frame format SLR camera.
2" M48 camera adapter is optional if thread on telescope focuser is not available.