depending on what focus the telescope has there will be only 1 or 2 ways to attach the camera.
1. If the focuser has T-Threads at its end, all you need is a T-Ring. Remove the Lens of the DSLR, replace the lens with the T-ring, screw it to the focuser.
2. If the focuser has a 2inch opening and no t-thread, then you need a 2 inch T-adapter screwed onto the T-ring and then insert the whole thing (with DSLR attached) into the focuser and tighten the 2 screws.
Thanks and RegardsSathyakumar Sharma,
Founder & Partner,
Universal Immersive Media and Education,
Bangalore.