A camera adapter is a device which helps you connect a camera to your telescope. It ensures that non-compatible parts can be used together. A telescope, for example, can be made compatible with all kinds of filters, prisms et cetera when using a camera adapter.
T2-ring + Camera Adapter
The first accessory here is a so-called T2-ring. The T2-ring connects your camera to the camera adapter. You subsequently mount the camera adapter onto your telescope. Most camera adapters are fitted with screw thread enabling you to attach a Barlow lens. This way, you get even closer to the object of your choice!