(Celestron C8-N telescope 8 inch Reflector.)
Either I'm really bad at this (highly possible), I have a bad secondary lens and need a new one, or with some help maybe there's something I'm missing. Over the last few years I've collimated this telescope, I've always had what seems like two issues. One, the secondary mirror doesn't line up perfectly inside of the focus tube, it's always SLIGHTLY off a tinnny bit. And two, the "true" center when viewing through the eyepiece, is not the center when viewing through the focus tube. Essentially, whenever I focus I feel like I sacrifice in one direction. When doing the star test to check for collimation, I'm always a tiny bit off. Last week it seems like it resulted in somewhat of a double vision of the planet. Typically collimation for me involves an extremely tedious combination and dance between the primary mirror and secondary mirror and sometimes it drives me absolutely crazy. And I feel like I'm never able to get this thing collimated perfectly.
Does anyone have experience with this specific telescope, and does anyone have suggestions on how to fix this problem? I was thinking potentially a different secondary mirror replacement. Or perhaps I'm missing something.