Collimating the Celestron 127EQ Newtonian

haejae · 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]

Great Red Spot · 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 · Post by **haejae** » Mon Oct 26, 2015 8:33 pm

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

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.
Regards

antares2063 · 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.

Regards
Junwei

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

Hi there.

This is my Celestron 127eq for reference.

: has 3 screws to adjust the Primary mirror.; C127eq back.jpg (24.39 KiB) Viewed 14802 times

: Front has 3 screws for the Secondary mirror; C127eq front.jpg (18.78 KiB) Viewed 14802 times

I used a Laser Collimator I got from Aliexpress.

: Collimator.jpg (15.67 KiB) Viewed 14802 times

Regards

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

yes that it is MibMom

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

Which are the screws to adjust the primary mirror?

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

You can refer to this for info :

https://www.youtube.com/watch?v=x2l38gjwE2A

https://www.youtube.com/watch?v=2kzYgmdoeOM

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)

SingAstro

Collimating the Celestron 127EQ Newtonian

Collimating the Celestron 127EQ Newtonian

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq

Re: Collimation of 127eq