Your optical tube is probably covered with a metal back plate. The 3 Phillip’s-head screws are there to hold the metal plate in place. Loosen them and remove the metal plate. You should be able to see the back of the primary mirror and 2 sets of screws around it.
- Q I’m trying to collimate my reflector but all I see at the back of my telescope is 3 Phillip’s-head screws. Where are the 2 sets of screws?
- Q My new Sky-Watcher telescope only came with an assembly instruction, shouldn't I get a complete manual?
- Q I clicked on the link to download the manual but all I see is page 1 out of 9 pages, and it is incomplete. What is wrong?