Jump to content


urgent need of figuring assistance

Recommended Posts

I am currently making my first 8 inch telescope mirror. 950 - 980 mm focal length. Figuring was going well, until I made a bit of a mistake and did a stroke for a bit too long. Around the centre zone I made a deep zone and I am unsure of how to fix it. I have a full sized & a 3 inch size lap to fix this. What stroke will help get rid of this? Surface texture is not an issue at the moment, I will smooth it out later. Any help is appreciated. 


Link to post
Share on other sites

Don't forget that the central zone plays virtually no part in forming the image, most of it being covered by the shadow of the secondary. Therefore , as your first mirror, errors in the central area can be left alone in preference to getting the edge good. Of course we all want to get perfection over the whole mirror but a classical cassegrain mirror performs perfectly as a Newtonian and that has a rather more drastic hole at the centre.


  • Like 2
  • Thanks 1
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

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.