Amazon.com : Astromania Metal T-Ring Adapter for Canon EOS DSLR/SLR (Fits All Canon EOS SLR/DSLR Cameras with EF Mount) : Electronics
FotodioX T-Ring for Canon EF and EF-S Mounts T2-EOS-FC10 B&H
Amazon.com: SVBONY T2 T Ring Adapter and T Adapter, 1.25 inches Metal Telescope Camera Adapter for Canon EOS Standard EF Lenses and Telescope Camera Astrophotography Accessories : Electronics
T-Ring for Canon EOS-EF Mount Camera | Celestron
Baader Camera adaptor Protective CANON DSLR T ring with built-in H-alpha 7nm narrowband filter
Zhumell T-Ring for Canon EOS Camera
Canon M-Mount T-Ring | Celestron
William Optics 48mm Wide T-Ring for Canon EOS-R Mirrorless Cameras # TM-CN-EOSR-M48
Celestron T-Ring for Canon EOS Camera # 93419
Alpine Astronomical Baader T-Ring Camera Adapter TRING-C B&H