Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Celestron 130 SLT tube cap

  1. Dec 27, 2008 #1
    Just received a Celestron 130 SLT for Christmas. I haven't had a chance to use it yet due to clouds and winds. I live 15 miles east of Cleveland,OH.
    Anyways, my question is: what is the purpose of the 2" cap/hole on the 5" tube cap?

  2. jcsd
  3. Dec 28, 2008 #2


    User Avatar

    Staff: Mentor

    That's for cutting down the brightness when you view the moon.
  4. Dec 28, 2008 #3
    Thanks, Russ,
    That had crossed my mind, but this being my first telescope and there is no mention of it in the manual, I thought I'd ask.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Celestron 130 SLT tube cap
  1. Celestron SGT11 (Replies: 5)