hello everyone I'm so happy I found this place !!! I have recently bought an older telescope its a celestron 11-inch Altima . I recently got a 2 - inch 90 degree and it will not fit into the back of my scope I need an adaptor but I have no idea what it would be called [exactly] or where to find such a thing . if some one could please help me find what I need to make this work I would be so grateful !!! thank you for taking the time to read this and possibly help?