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.

rory

primary mirror clips.

Recommended Posts

i flocked the area around the mirror the other day and its all back togeather and views are fine. but ive a niggle at the back of my mind. when i placed the primary back and placed the three clips back on with two screws on each clip,im sure i did them up reasonably tight. not over the top but secure shall we say. trouble is i cant recall how tight they were when i dismantled it ? should the clips be just touching the mirror , not at all ,or securely ? :(

thanks .

Share this post


Link to post
Share on other sites

The mirror clips should not be tight at all, if they are even slightly tight, you will get triangle shaped stars and it will not show a good image.

I was informed by a regarded scope maker, that the mirror should be free to move, not sloppy, but able to rotate by hand.

I got some of the brown baking parchment, which is fifteen thou' thick and tightened the screws down to it, and then slackened them off until I could move the parchment under the clips, without it being trapped. This gives a clearance, without it letting the mirror move back and forward.

If you have triangle stars, it's to tight, that was the problem I had after taking the mirror out for a clean.

Hope that helps.

Share this post


Link to post
Share on other sites

thanks baz. my niggle was justified by the look of it then. shall sort it now.

Share this post


Link to post
Share on other sites

I nearly had heart failure when I tried that on my dob, I tightened the screws only a bit and all my stars looked like triangles, didn't know why at the time. I had to adjust them so they were barely holding the mirror before it was ok.

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.

Guest
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.