Celestron T-Rings For 35mm Cameras for Canon Auto Focus 35mm and Digital Cameras. This accessory is required if you want to do any type of photography through a Telescope Accessories or spotting scope. Each camera manufacturer has a different mount which requires a specific T-Ring so Celestron offers a full line of T-Rings. To use a Celestron T-Ring For 35mm Cameras remove the diagonal and/or eyepiece from your Celestron Telescope (some models require use of an eyepiece - see your instruction manual). Then you need only remove your normal camera lens attach the proper T-Ring for your camera and mount the combination to the rear cell of your Celestron Telescope or Celestron Spotting Scope with a Celestron T-Adapter. Check your camera's instruction manual for more detailed information. Specifications for Celestron T-Rings For 35mm Cameras: Manufacturer: Celestron Condition: New Package Contents: Celestron T-Rings For 35mm Cameras