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.



Dodgy Celestron Focuser

Recommended Posts

Hello to you, I am currently having a bit of trouble with the focuser on my Celestron omni 120. I'm getting a massive amount of slop that's making it impossible for me to image jupiter unless I go unbarlowed and even then I have to be ridiculously careful when adjusting focus.

Does anyone have any advice or perhaps you know of some simple modifications that could be made?

Edited by Mamsoth

Share this post

Link to post
Share on other sites

This is too funny. I just took apart my 120 focuser about 10 minutes ago because of the same problem. I fixed most of the slop by first cleaning all the parts in the focuser and re-lubing with superlube. There are two setscrews (very small) on the outside of the focuser that adjust the rear and forward slop in the tube. They do not react as you would think and I had to play with them a bit until I found a satisfactory movement. Unscrew the larger tightening knob all the way while making adjustments to the two setscrews. I did not get all the slop out (probably from age of the focuser) but it cleaned most of it up quite a bit. If you find the tube sticking at certain positions, it is caused by a burr on the tube where the small setscrews can hit. I used fine sandpaper (steel wool might work) to polish off the burr. I then added lube to the entire area that the setscrews come in contact with and started the setscrew adjustment all over. Give it a whirl, you can only improve it over the way it is now.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • 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.