TS OPTICS 48mm T-ring For Canon RThe TS Optics Wide T Ring for Canon EOS R allows you to connect telescopes and adapters with an M48 x 0. 75 thread to your Canon R, RA and RP mirrorless full frame cameras. The larger M48 x 0. 75 connection means you won't get vignetting at the edges of the full frame sensor. Specifications Camera connection Bayonet Canon RF mount Telescope connection M48 x 0. 75 female thread Optical thickness 9. 8 mm