Collimating the Celestron 127EQ Newtonian

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haejae
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Collimating the Celestron 127EQ Newtonian

Post by haejae » Mon Oct 26, 2015 7:03 pm

My Celestron 127eq seems to be out of collimation but it does no have collimation screws on the back and no collimation cap. Can anyone help? [smilie=ahaaah.gif]

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Great Red Spot
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Re: Collimation of 127eq

Post by Great Red Spot » Mon Oct 26, 2015 7:23 pm

When the haze finally disappears, point to a star. Defocus the image. U will see a black shadow in the middle,like a donut. Make sure the donut is symmetrical.

haejae
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Re: Collimation of 127eq

Post by haejae » Mon Oct 26, 2015 8:33 pm

Okay thank you. Is it feasible to buy a collimation cap?

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Airconvent
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Re: Collimation of 127eq

Post by Airconvent » Tue Oct 27, 2015 12:52 am

Hi Haejae
There should be screws behind the mirror for this. Do check out the instruction manual which should provide the steps on how to do this.
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antares2063
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Re: Collimation of 127eq

Post by antares2063 » Tue Oct 27, 2015 8:21 am

Hi, if I remember correctly Celestron newt have a base plate covering the access to the collimation screws (at least mine did, but mine was a late 1990s design).

If the rear end of your scope tube has 3 screws, remove them and the thin "base" plate which will allow you to see the screws. If you already see 6 screws arranged in sets of 2 spread out like a triangle.. those are your collimating screws. (3x2)

You can trying searching on google or youtube for videos on collimation of the C127.

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Mibmom
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Re: Collimation of 127eq

Post by Mibmom » Tue Oct 27, 2015 10:51 am

Hi there.

This is my Celestron 127eq for reference.
C127eq back.jpg
has 3 screws to adjust the Primary mirror.
C127eq back.jpg (24.39 KiB) Viewed 6468 times
C127eq front.jpg
Front has 3 screws for the Secondary mirror
C127eq front.jpg (18.78 KiB) Viewed 6468 times
I used a Laser Collimator I got from Aliexpress.
Collimator.jpg
Collimator.jpg (15.67 KiB) Viewed 6468 times
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haejae
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Re: Collimation of 127eq

Post by haejae » Tue Oct 27, 2015 2:37 pm

yes that it is MibMom

haejae
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Re: Collimation of 127eq

Post by haejae » Tue Oct 27, 2015 2:39 pm

Which are the screws to adjust the primary mirror?

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Airconvent
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Re: Collimation of 127eq

Post by Airconvent » Tue Oct 27, 2015 8:51 pm

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SebastianTai
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Re: Collimation of 127eq

Post by SebastianTai » Wed Oct 28, 2015 9:22 pm

Collimation will be not be possible using laser collimator. This is a Bird-Jones newtonian with corrector lens. The only best way based on my experience will be using star test to get a good collimation. Laser never get collimation done (Laser point become a large blurred circle due to presence of corrector lens)

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