Ring attaches securely to canon eos dslr or slr camera body and provides a t thread interface. fits all canon eos slr and dslr cameras with ef mount Securely fits canon eos 35mm dslr and slr cameras via bayonet-style attachment Threaded ring couples canon eos camera body to standard t-thread on most camera adapters Couples canon eos camera body to standard t-thread found on many camera adapters used for astrophotography All metal construction and anodizing aluminium process Tydeux Metal T-ring Adapter for C anon EOS DSLR/SLR (Fits All C anon EOS SLR/DSLR Cameras)