2 replies to this topic

[kb38758]

I recently was forced to remove my secondary mirror on my Orion Xt10g Dob telescope to clean the mirror, due to a large spot spot on it.

After replacing it and collimating as I usually do I now have a  odd extra coma on the right side of all images.

I've checked and recheck collimation and can't spot the error.

I suspected that the secondary is a tiny bit closer or farther from the primary mirror than before but I can't see any issue.

I use Cheshire, Lasor and pinhole cap for collimating.

I did not remove the primary mirror.

Any help would be appreciated.

Attached are the full image, the left side magnified that seems normal for my scope and the right side  magnified which shows the image issue.

 

 

 

 

[unimatrix0]

Probably a tilt, which lasers will not show, and neither the Cheshire if you're looking at the wrong thing. 

 

You get more luck with experienced Newtonian users here: 
https://www.cloudyni.../68-reflectors/

 

Remember, in the beginners forum- you get beginner answers. 

[kb38758]

Probably a tilt, which lasers will not show, and neither the Cheshire if you're looking at the wrong thing. 

 

You get more luck with experienced Newtonian users here: 
https://www.cloudyni.../68-reflectors/

 

Remember, in the beginners forum- you get beginner answers. 

Thank You for the response!

I'll post there also.

PS: I'm still a beginner in a lot of this.