Celestron T-Adapter EdgeHD 8in. This arrangement is used for terrestrial photography and short exposure lunar and planetary photography. Celestron T-Adapters can also be used for long exposure deep-sky photography when using a separate guidescope. Both a T-Adapter and T-Ringare required to mount a 35mm SLR camera to your Telescope or Spotting Scope. Features of Celestron Telescope T-Adapters: Allow you to attach 35mm SLR camera to the prime focus of Telescopes Can also be used for Spotting Scopes Package Contents: Celestron 35mm SLR cameras T-Adapters for Telescopes & Spotting Scopes