I just bought a Canon Xsi. My grandfather gave me his Telescope. It is The Discoverer Bausch and Lomb 60mm Telescope. He gave me his adapter. It's called a Telephoto adapter and screws into the eyepiece. On the base it says Bushnell # 20-0008. The only problem is that it is too small for my camera because it is made for a 35mm camera. I have been looking on the net and I think I just need a T-ring. Is this correct? Or do I need a new adapter to?