Hi, I am asking anyone who owns an Orion 80ED T CF short refractor if they know by chance the thread size at the eyepiece end of the drawtube where the visual back screws onto the tube. I asked Orion but the people I talked to did not know. I am wanting to get a Baader Clicklock eyepiece clamp but there are so many and if I knew the thread size I could order the right one. I ordered one that said it fit the Orion 80ED which is a really less expensive scope and it didn't fit. My Bad. I have also contacted Baader but no answer.