Collimating Scope and Lenses question...


    A year or more ago, I got an Apertura AD8 Dobsonian, and tried it out shorty after. It seems though when I've tested it, that the 9mm lens and moon filter tend to give me fits, and reading elsewhere, it seems it may be possible for the scope to need collimation and that even the laser for collimation may be off. this brings in my two questions:

    How does one collimate the laser used for collimation? Also, how does one go about Collimating the scope itself, once the laser is properly tuned? I have no experience in this department and could use any help possible. I am thinking this is finally the year I'm going to start using the scope. (On a note, I'm also not sure I got the right terms)

    Also, is there anyone or any place in the Pittsburgh area that can be of help? Thanks in advance for all your help.
  2. bladekeeper
    This is one of the best collimation guides available and will tell you all you need to know about collimation: Astro Babys Guide to Collimation

    This video has tips on collimating a laser collimator.

    Collimating is very easy, and is quickly accomplished after a bit of practice. I started off using my laser collimator, but have since acquired a collimation cap and a cheshire sight tube. I've never collimated my laser. There should be a small allen head screw on the side of the laser for the adjustments.

    Nowadays on my AD12, I verify collimation with my collimation cap and tweak it if necessary, but since using the cap, for the past few months I've only had to adjust it a couple of times.
  3. bladekeeper
    This is the cap I use: Rigel Systems Aline Telescope Alignment Eyepiece / Collimation Cap

    Hope some of this helps. If you have any further questions on collimating, it would be good to ask them out on the open forum in the beginner's section. There are a lot of experienced folks that can help, and they may not be part of this particular group.
  4. bladekeeper
    Oops! Here's is the video for collimating the laser:

    Must have fallen off my first post!
  5. resq
    I use the celestron Cheshire collimater. Just slides in and align the circle! Easy enough and better than the laser.
  6. bladekeeper
    Yeah, that's the one I've got too. It works really well. My poor ol laser hasn't been out of the case in months. Might have to give the cat some exercise with it.
    Lemme ask this too: I looked at the Rigel Systems Aline Telescope Alignment Eyepiece / Collimation Cap, and also started looking into the Cheshire Collimator and came across these, but which one would I want and will this work for my AD8?

    Search results for: 'Cheshire Collimating Eyepiece'

    Thanks again for all your help.
  8. resq
    This is the exact one I have and will work well for you. Celestron 1.25" Cheshire Collimating Eyepiece for Newtonian Reflectors # 94182
  9. bladekeeper
    The Rigel Systems Aline Collmation cap is a good one, and that is the collimation tool that I use the most. A quick check at the start of the session and I'm usually good to go.

    Only problem is, if that is all you buy from Agena, you have to get two of them to get over the minimum order threshold.

    I've also got the Celestron Cheshire that Tim (resq) recommends. It's good too. So, between the Aline cap and the Celestron cheshire, my laser collimator never comes out of the case anymore, unless I'm entertaining the cat.
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