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    Default Collimating 114 eq, what to tweak?



    Just received the scope, still cloudy so I haven't looked at stars, just took it outside in daytime to make sure it wasn't completely broken.

    In the meantime, I am trying to make sure the collimation is correct. Centered my eye over the eyepiece hole; the reflecting mirror and the spider all are centered. I even modified the eye tube cap by drilling a hole in the center to make a collimating cap.

    What is off is the reflection of my eye peering into the eye tube. This reflection is centered nearly 1/2 of the way between the center of the area obscured by the secondary support and the edge.

    I have looked at a video posted elsewhere on the forum - it didn't seem to cover this case.

    Is this offset normal, or should it be adjusted?

    What would need to be adjusted-secondary or primary mirror?

    The thumb screws to adjust the primary mirror are very tight, and there are the 3 phillips head screws too. Don't want to break anything by turning a screw that might cause to much preassure on the mirror. Am looking for some advice on using these adjustments.

  2. #2
    sxinias's Avatar
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    Default

    Which make and model 114 eq do you have. Many are of the short tube "jones bird' design and are difficult to collimate.I would say don't do anything at the moment. Wait and do a star test to see if you really have a problem.
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    JPWallace (02-05-2010)

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    It is a Bird-Jones....I haven't touched mine...don't think I need to....my advice wait and do a star test...stick a bright star in the middle of the Field of View and then defocus in both directions...if the black spot in the middle pretty much stays in the middle I'd leave well alone!

    I know you have clouds...but my approach to collimation so far has been let sleeping dogs lie...and the view my scope is great anyway!
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    I suggest getting a Cherise eye piece. As long as your primary is center marked it is only a matter of minutes to align it.
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    The really fun thing is Cherise - no centre marking on these scopes - nice!
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    I center marked a mirror just the other day by adhering a paper hole reinforcement label to dead center just so I could use the chesire.
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    Default

    There was tutorial for doing this on the similar 130EQ posted on this forum this week.
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    Post 114 EQ FirstScope collimating

    I, too, am new to astonomy, so I may be asking questions that have already been asnwered but I couldn't find.

    Those of you who were kind enough to offer advice missed the part that most concerned me: "The thumb screws to adjust the primary mirror are very tight, and there are the 3 phillips head screws too. Don't want to break anything by turning a screw that might cause to much preassure on the mirror."

    I bought an eyepiece (Celestron #94182) and I can adjust using two of the three thumb screws, but one is already tight the direction I need to go.

    So I guess the questions are:
    a) What are the thumbscrews for?
    b) What are the three Philips screws for?
    c) Where is the "center bolt" to roatate the secondary holder? - Like I know what these terms mean. :-)

    Thanks in advance. My son and I are looking forward to seeing the heavens and learning from Forum members.

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    Default

    Ok, sorry about that.

    I haven't looked it up, but i think the thumbscrews are to for added security once it's set up, and the Phillips screws adjust the mirror. No sure what you mean about the center deal-yo.

    Here's how I do mine-- loosen the thumbscrews, adjust only two of the Phillips screws (so you aren't chasing after your own adjustments) and then retighten the thumbscrews.
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    Smile

    Whoa. That made a difference. But on ours, I loosen the screws and use the thumbscrews to adjust. But questions beget answers that beget new questions:

    a) We found a star/planet in the general vicinity of where Saturn should be. The image looked like a fuzzy metal lock washer (with a small opening, but flat). There was nothing inside the washer i.e. nothing visible as an object.

    b) We couldn't get it to come into sharp focus. I even tried doing an on-the-fly collimation while looking at the washer-shaped object. All it did was move the object in the eyepiece.

    Note: We are not looking through glass, but there are a couple of street lights (not very bright) on the peripheries (sp) -- they are about 0 and 180, we are looking 90. But we could put the telescope outside to rid us of ambient house light, but it's too darn cold out there.

    I guess, as newbies, it boils down to: What should we see when we see what we are looking for?

    I am sure it will be a while until we see the beautiful deep-space stuff, but the Pleiades are going to be putting on a show this Spring and I would like us to see it much closer.

    thanks for your help and patience,

    len

 

 
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