The T-ring for Canon EOS Cameras allows you to attach a Canon EOS 35mm DSLR or SLR camera to telescopes, camera adapters, and other astrophotography accessories equipped with standard T-threads. The bayonet-style attachment securely couples the Canon EOS camera body to the telescope, adapter, or accessory. A T-ring converts a camera's mount to a standard T-thread, and this model is designed to work with all Canon EOS format camera bodies. All camera adapters, including Orion, Cele stron and Mea de T-adapters and universal camera adapters, will fit the threads of this anodized aluminum T-ring. This T-Ring is designed to work with Canon EOS brand 35mm SLR cameras. It's also compatible with new digital SLR cameras.