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Thread: Celestron 127EQ - how to remove primary mirror

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    Default Celestron 127EQ - how to remove primary mirror



    New owner here of the 127EQ - I'm a 70yr old astronomy 'newbie" - lol

    I did read the sticky under improvements but fail to understand the instruction on primary mirror removal. It says:

    " 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."

    So, in Chicago English - lol - I have the open end of the tube facing down, the base is facing up and I'm looking at the three pairs of screws (with a set of Bob' Knobs on the way) which I can identify as locking and collimating screws.

    NOW WHAT???? Can you assist me in getting the mirror in hand using instructions simple enough for my aging brain to comprehend and follow? I don't understand "Unscrew the side" or Turn the Tube hand with the base?

    I do also have a Catseye template and triangle sticker enroute and already have a Cheshire Collimator (non-laser)

    Thanks in advance for helping teach an old foolish dog a few new tricks.

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Hello and welcome Randy
    If you look at the ring on the back of the telescope there should be a series of screws/ bolts holding the ring to the tube.
    Set the telescope on a solid surface and remove those. The mirror cell will pull off the back of the telescope.
    You can then loosen/ remove the mirror clips and take the mirror out of the cell.
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    Default Re: Celestron 127EQ - how to remove primary mirror

    Thanks for the response - If I am getting the picture, you are speaking of screws along the outer edge of the tube rather than the 3 collimation locking screws - adjacent to the collimation screws - on the back of the scope tube 'cap'?

    Do these screws also have a nut on the inside of the tube? How are the nuts dealt with/re-installed?

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Quote Originally Posted by chicagorandy View Post
    Thanks for the response - If I am getting the picture, you are speaking of screws along the outer edge of the tube rather than the 3 collimation locking screws - adjacent to the collimation screws - on the back of the scope tube 'cap'?
    yes

    Do these screws also have a nut on the inside of the tube?
    No

    How are the nuts dealt with/re-installed?
    The tube is drilled and tapped where the screws go, just be careful not to overtighten when putting the mirror assembly back into the tube.

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    Default Re: Celestron 127EQ - how to remove primary mirror

    TERRIFIC! Sound simple enough that even someone from Illinois can do it. lol

    I look forward to watching the heavens and learning a new skill.

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Terrific! I'm looking forward to learning a new, fascinating hobby.

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Is there a reason why you would want to remove the mirror of a new telescope?
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Celestron 127EQ - how to remove primary mirror

    I am lead to believe that a center spot is used to collimate a telescope and that the 127EQ does not come with one. I ordered one and a template from Catseye and a set of adjusting screws from Bob' Knobs for that purpose, along with a Cheshire collimator.

    I hope I have not begun a pricey Fool's Errand in that regard?

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    Default Re: Celestron 127EQ - how to remove primary mirror

    The center dot can be just a circular paper reinforcement and the template can be cut from a piece of regular paper, much less costly
    Your telescope style is what people refer to as a Bird-Jones and if you have not noticed yet there is a corrector lens inside the focuser tube.
    You will need to remove that when collimating the telescope and then replace it afterwards. It is a cemented doublet so pay attention to which side goes in first!
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    Default Re: Celestron 127EQ - how to remove primary mirror

    I don't mind the cost of the Catseye products, the triangle dot is only $2 USD and the template was about $12. (I've spent a lot more in my life on a lot more useless things - lol)

    I'm the sort who tries to self-educate as much as possible but internet 'knowledge' can sometimes be an oxymoron - lol

    I know I've read someplace, for example, the primary mirror assembly in the 127EQ can be removed by loosening the collimating and locking screws and lifting up on the backplate using the locking screws as handles? Rather than removing the screws on the circumference rim of the tube and taking off the whole end cap? I have no doubt that once I achieve success in removing the mirror assembly and applying the triangle dot decal that my whole line of rookie questions will seem lame even to me, so thank you all for having patience with a curious and confused newb.

 

 
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