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Thread: Improvements for Celestron Powerseeker 127 eq

  1. #1
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    Post Improvements for Celestron Powerseeker 127 eq



    If you are considering to buy this telescope or you already have it, I know that all the forums says that it is a complete waste of money . Well, I think you need to understand that this telescope is a 5" for less than $150 (in USA)!, I mean you get what you pay for . But with some improvements you can push it to the best .

    You may have noticed that the collimation by the traditional way is almost impossible.

    This is due to following:

    - The screws are very difficult to maneuver

    - The "Barlow" or internal relay; which is the reason which you can't use the classic "Cheshire" or laser collimators.

    But what is the collimation or why they need to collimate the telescope?

    It is the first question and the answer is that, all optical systems needs to be aligned regularly, this is to adjust the optical elements in order to conducte the light to your eye, the way they were designed to be able to give clear images of celestial objects. An uncollimated telescope gives blured images and the coma effect, where all the objects are seen with a tail like comets.

    Ok here we go. We need the following:

    2 packages of 2 thumb screws of 4.8x12.7 mm or 10-32x1/2" sold at Home Depot


    2 packages of 2 thumb screws of 4.8x25.4 mm or 10-32x1"

    3 small springs
    1 pair of latex gloves
    1 lithium general propurse grease sold at grainger or silicon grease sold in Steren
    1 laser collimator
    1 donut sticker of 1 cm of diameter (usually it comes with the laser collimator, or you can make it)
    1 plastic tap with an inner diameter of 40 mm (the most important and also economical element of the process)
    1 piece of thin paper
    1 Phillips screwdriver


    The first thing to do is to remove the primary mirror, to mark it with the donut sticker and change all the screws at the bottom of telescope.

    Just remove the telescope from the equatorial mount and flip it, so that the open end of the tube is facing down and back up, this in order to unscrew the side without fear of dropping your mirror (¡¡¡¡ be careful !!!!! ).

    Then take your hand with the base of the primary mirror and carefully turn the tube. Remove the tube and then you will finally expose the primary mirror.

    In case your primary mirror is very dirty, then check this out:
    Visual Astronomy: How to Clean Your Telescope's Mirror

    Be very careful with your hands, this is time to use the gloves. At this point you need to view the following video (Don't miss this step, it is vital for the collimation):
    [ame=http://www.youtube.com/watch?v=RsFuXQlh1lw]YouTube - Farpoint Cheshire Spot Application[/ame]

    Now, you can put your primary mirror where it was, Ok, it's time of change the phillips screws for the thumb screws, it's very important that you put the springs instead of the plastic rings, this will give you greater manipulability in the collimation.


    Before replacing the tube in the equatorial mount is time to lubricate all parts with silicone grease (ask the full viscous, low viscosity is only for cleaning) or you can also use lithium grease.

    It's time to start with the collimation, I could explain you, but I think there are people that can show you how in youtube, so I please see the following video (Please get advice of you can only do this if first you removes the internal barlow, and when you finish, you need to put it in the same place):
    [ame=http://www.youtube.com/watch?v=yd3mjOr8rc0]YouTube - telescope collimation - how to collimate telescope[/ame]

    Ok, this is where our telescope requires special attention for a successful completion of the collimation without the necessity to remove the barlow (Don't worry, there is no lost time if you already saw the previous video, because it helps to explain the collimation).

    You have to cut the bottle cap 5mm in the side and make a hole in the top center of 1.5mm.




    Turn the telescope focuser knob in, until it stops.



    Put the modified cap in the bottom of the focuser.


    Ok, follow the instructions for collimating according to the video we saw earlier, my advice is that you should to place the piece of paper around the laser collimator, this is to fit it in the focuser.

    For collimate the primary mirror, you need to see in directly to the bottle cap and try that the shadow of the donut stick (or triangular) you put on the primary mirror is centered with the hole in the bottle cap.


    That's it, now you can enjoy your telescope for hours , until ..... it requires another collimation again. But don't worry, now, you have the elements to make the collimation in no more than 2 minutes .

    Let's see Saturn ...
    [ame=http://www.youtube.com/watch?v=EWaqbZ-oSOc]YouTube - Saturno con Celestron Powerseeker 127eq[/ame]

    This post applies to any telescope with internal barlow (bird jones).

    You may reproduce this article, only giving the necessary credits.
    Ylem, Mohamed, MPH and 2 others like this.

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    niuno15,
    Thank you again for this information and translation!!!!
    I think the hard part will be finding a bottle cap that fits, should be around 1.5" inside diameter.
    Jeff

    Tasco 60mm,
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    Sorry for my english, I would appreciate any correction . I think you can try with a cap of Tylenol, mine I made with a medicine bottle cap (usually they come with an inside cover, that you need to remove).

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    Mmmm even you can make your own cap, remember you have the measures, then with glue, paperboard and scissors you can do it.

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    No problem with your English, it's alot better than my Spanish.
    I found a pill bottle cap and the screws just need a laser collimator to give this a try.
    Jeff

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    Excelent! you will see the difference. Don't forget the springs, they will help to the collimation.

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    I was also able to use this procedure to collimate my Meade DS2130, which was giving me a really hard time before I was shown this thread. The only difference is that my focuser required me to use a slightly larger collimation cap. Thanks!

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    Very good! that kind of telescopes (bird jones) are a little bit tricky to collimate and most of them finish in a garage sale (I got mine in that way) because of that "problem".

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    Thank you for your excellent photos, video and information!

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    Thank you for the information. It helped me a lot!!!!

 

 
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