Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.


Collimation With Al's Reticle

Recommended Posts

In my head this makes sense so there is a good chance i'm wrong and thought i'd throw this out for an opinion...

I have been collimating my scope, ive my scope way out of focus and have my DSLR in so i can work on the end of the scope whilst watching the screen. I got pretty close to centre but then though how do you really know your centred, my eye for this probably isn't as good as the more experienced collimiators out there. So i took a 10sec photo of Pollux and then placed Al's Reticle over the top and increased the reticule size to match the stars outer ring, then reduced the reticule size to the next set of rings and eventually to the centre. (see attached)

In my head if your lined up with the outer circle and if you are properly collimated then as you reduce the reticule size then it should match all of the inner cirlce's because your concentric.

Have i finally contributed a good idea? :) Or more likely :), Why am i wrong?




Share this post

Link to post
Share on other sites

Al has actually developed a new reticle overlay specifically to assist with collimation!!:)

Al's Collaid V1.1


Share this post

Link to post
Share on other sites

(if the scope is a Newt) I would have expected that the shadow of the diagonal at this far out of focus to be off centre when perfectly collimated - as there is an offset for even field illumination. This shouldn't affect the just inside and outside of focus images.

If it's a SCT or MCT, then concentric should be good.. but its the in-focus star images on-axis that will be the determining factor, not the out of focus images

Edited by cathalferris
different scope types, different treatment.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.