Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 13-05-2024, 07:49 PM
mldee's Avatar
mldee (Mike)
Photon sorter

mldee is offline
 
Join Date: Aug 2008
Location: Near Warwick, Qld, Australia
Posts: 656
Advice on RC8 star collimation

Finally, clear nights and temps still above zero!
Put the OCAL-collimated RC8 with imaging train on the AM5 with a 183mm binned 4 screwed onto the OAG housing.

First pics before any adjustments looked promising, although some donut variation across the image.

I have two questions:

1 - What is causing the variations in roundness
and
2- Which screws to tweak to improve roundness: Primary, secondary or image train adjusters?

Pic shows setup and initial image before any adjustments.
Thanks,
Attached Thumbnails
Click for full-size image (Stars.jpg)
197.9 KB27 views
Click for full-size image (Imaging train.jpg)
148.9 KB22 views
Reply With Quote
  #2  
Old 18-05-2024, 10:19 PM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 249
RC8 collimation

Hi Mike,
My approach may be naive, but it seems to work for me:
I approach RC collimation as 2 tasks - out of focus (OOF) roundness, and
centering the central OOF point.

I first Center the secondary using my eyes.
The the OOF roundness is adjusted with the collimation screws on the body of the telescope. Use a circle in your display to help get roundness correct.
Next adjust the secondary to Center in the image. When it gets close, you will see most of the OOF images are centered.
Here’s the type of resolution I am getting with my RC-8 carbon.
https://www.iceinspace.com.au/forum/...e.php?a=315489

Last edited by MarkInSpace; 18-05-2024 at 10:24 PM. Reason: Added link
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:17 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement