Hi. I have a question regarding this and I also have a problem. well it started when I put my father's camera into my telescope which is a Celestron Nexstar 130 SLT. a real beaut. but heres when the problem comes in. the camera's shutter lock feature was already off so its not that. the problem is that I cant get it focused when I attach my camera to the scope. I think i have a focal length of 1.25" which is my telescope but I dont know which T-Adapter type do I need for this. I already have the T-ring that attaches to the camera. what do you think the problem is?