The Meade #64 T-Adapter is the basic means of prime-focus photography with Meade ETX-90/105/125 telescopes and spotting scopes. Thread the T-Adapter onto the rear cell of the telescope, followed by a T-Mount for your 35mm camera. Then you can couple the camera body to the telescope.
To attach your camera to your Meade ETX-90/105/125 telescope or spotting scope, you will need both the #64 T-Adapter and the appropriate T-Mount for your camera.