Jump to content

NLCbanner2024.jpg.2478be509670e60c2d6efd04834b8b47.jpg

My Christmas Present!

Damo636

By Damo636
in Discussions - Eyepieces

Recommended Posts

  • Replies 66
  • Created
  • Last Reply
swamp thing

swamp thing

Posted
Posted

No don't worry Adam its not Irreversible.

Just check they aren't pinching your primary. If over tightened they can make the scope perform badly.

If so just loosen them a bit no harm done.

They should just hold the primary not squeeze it.

Regards Steve

Link to comment
Share on other sites
John

John

Posted
Posted

I think the clips being referred to are the ones that hold the mirror into it's cell - the ones you can see looking down the tube - usually 3 of them but sometimes 6. They should not be quite touching the mirror surface but should be very close to it - the thickness of a piece of thin card used to be cited as a guide. If they are pressed down onto the mirror they can cause a slight temporary distortion in the figure of the mirror which causes visible aberrations.

Overtightening the collimation locking screws can cause problems too - those screws should be just finger tight, not more. Many folks don't use them at all.

Link to comment
Share on other sites
Adz

Adz

Posted
Posted

Thanks for the clarification John. Today I took out the primary mirror to take a look at the holding clips. They were very tight... I am hoping this is the reason for my star patterns. If there is still a problem I will create a new thread, I don't want to sabotage this one any further!

Link to comment
Share on other sites
Damo636

Damo636

Posted
  • Author
Posted

Hey Adam. I will be very interested to hear the outcome of loosening the holding clips. I have had the primary out on a couple of occasions but its something i have never thought of checking.

PS. Don't worry about sabotaging the thread, i promise i won't take offense :p

Link to comment
Share on other sites
Adz

Adz

Posted
Posted

Okay I have fully pulled my scope apart, ready to flock it. During this I have adjusted the primary retaining clips so a piece of card can fit in between them and the mirror.

Hopefully this will solve the problem, will get back to you guys after my next session :p

Link to comment
Share on other sites
  • 4 weeks later...
Adz

Adz

Posted
Posted

Little update then. Took the whole scope apart, flocked the OTA and focuser, blackened the secondary sides and loosened the primary retaining clips (they were very tight). Bought a second hand hotech collimator to really get my collimation great and stress free, I really like things to be as optically perfect as possible (a little OCD I know!).

After all of this, I should have known I wouldn't have a clear night for 3 weeks :D

Oh and did I mention I bought a 3-6 Nagler to try out and haven't had a go with that yet, WHY DO WE DO THIS TO OURSELVES! :)

Link to comment
Share on other sites
Adz

Adz

Posted
Posted

A big thanks to the people who offered advice on my problem instead of patronising like some other forums might etc. Especially to Steve, John and Damo.

Who's going to SGL7? I would like to get you guys a beer. And this is all before I have seen whether my stars now look great in my scope!

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • 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.