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.



Which CLS Filter?

Recommended Posts

Hi all, which CLS filter would be best? I get nasty red rings around the stars with my modded Canon and wondered if one of these would stop that.




Share this post

Link to post
Share on other sites


I don't think a light pollution filter will help.

I get the red ring with my modded Canon, even with  the Astronomik CLS CCD filter. The best suggestion I've found which works is to adjust the focus so that there is a blue ring rather than a red one.

That said, I do need the filter and for my heavily light polluted back garden skies and wouldn't be without it.  The image comes out with a lot more blue and the green part of the spectrum is rather weak, but without it, 30 seconds at ISO 1600 washes the sky out to an unprocessable pink mush.

Share this post

Link to post
Share on other sites
Posted (edited)

Hi. If you simply want to lose the red halos, maybe better -cheaper- to try one of these instead?

HTH and clear skies

Edited by alacant

Share this post

Link to post
Share on other sites
Posted (edited)

Hello Alexxx,

There was an IDAS LP filter  (2" though?? )  on AB&S recently. They are meant to be very good..... although it has been reported that they may be subject to internal reflections...    anyway...  it was a good reduction.   It might help.


It has just popped up on the classified on SGL.


Edited by Craney

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.


Important Information

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