T-Mount by Vixen Optics is a device which permits you to attach optical devices to your camera system that were originally created for other purposes. Thus, if you have a telescope with T-Mount threading upon either the rear of its focuser or upon the device you've inserted into the focusing tube, you can then employ a T-Mount to allow your camera to interface directly with the telescope. Simply screw the proper T-Mount for your camera system to the T-Mount threading and then attach your camera to the T-Mount as if you were uniting the camera with a lens as normal. Please note that you'll need a rigid support system to take full advantage of this capacity, and often you'll need additional counterweights for your telescope's mount if it is a German-type equatorial mount.
T-Mount Adapter for C-Mount System