Collimation

[Sconesbie]

Tonight I grabbed my 4" on EQ mount out. I haven't used it for a while. I noticed a thin blue line around the moon and the stars wouln't pin point for me. Is that a collimation issue? It wasn't dark enough to get the stars to "donut" properly in the eyepiece.

[astronobob]

Hi Scott,
Have you checked your collimation ?

Here is one y-tube Link : https://www.youtube.com/watch?v=bZV_g57pto4

And another to give insight on How to Collimate, , ?
https://www.youtube.com/watch?v=jcL37RJuVyQ

[Sconesbie]

Thanks Bob. I haven't collimated this one for a long time as it's been sitting in my loungeroom unsed. I have a 10" dob that I use most of the time.

I'll try that and see if it sorts it out.

[xelasnave]

Whilst looking at the utube links I found this one which I thought was rather good.

https://www.youtube.com/watch?v=n97dn-nGGlo&t=1980

alex