#1  
Old 21-05-2020, 10:02 PM
Benjamin's Avatar
Benjamin (Ben)
Registered User

Benjamin is offline
 
Join Date: Jun 2013
Location: Moorooka, Brisbane
Posts: 648
Secondary Mirror Mod

ďĎAllo againĒ

Just wondering if others have done this Astronomy Shed secondary mirror mod?

https://youtu.be/MUE8fxqH3Qc

Iím keen to give it a go on my Skywatcher 8Ē Quattro as itís been over tightened by me in the past (have Bobís knobs already inserted in the secondary holder) and its now hard to adjust easily without a bit of jumping around (much time spent iteratively auto-collimating and recentering). Part of me thinks a whole new spider and secondary holder might be a better solution (say a TS Monster Spider) but also keen to hear of other possible solutions. Any advice welcome! If you have tried it and have a spare but of Teflon sheet or a 35mm OD 10mm ID washer...
Reply With Quote
  #2  
Old 22-05-2020, 08:12 AM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 970
Hi Ben,

I have done this mod in the past with an older 2nd newt that I had which had developed these indentations over time. I simply used a nylon ď panel washer ď the same size as you have described. It worked a treat and made it much easier to collimate without the secondary shifting back as I locked it off.

Cheers

Ryan
Reply With Quote
  #3  
Old 22-05-2020, 08:26 AM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 5,752
Sorry, I had to laugh. I need a translator for that video.
Reply With Quote
  #4  
Old 22-05-2020, 09:30 AM
Benjamin's Avatar
Benjamin (Ben)
Registered User

Benjamin is offline
 
Join Date: Jun 2013
Location: Moorooka, Brisbane
Posts: 648
Ha, he does some great videos! Less glam than some perhaps.

Will give the Nylon washer a go too. Have the stainless steel washers anyway as a staring point :-)
Reply With Quote
  #5  
Old 06-06-2020, 09:05 PM
Hedworx (Luke)
Registered User

Hedworx is offline
 
Join Date: Jan 2020
Location: Country
Posts: 1
I tried it and it all went swimmingly, can thoroughly recommend it
Reply With Quote
  #6  
Old 06-06-2020, 09:09 PM
Benjamin's Avatar
Benjamin (Ben)
Registered User

Benjamin is offline
 
Join Date: Jun 2013
Location: Moorooka, Brisbane
Posts: 648
Iíve got a nylon washer version up and running which has made collimation much easier. Have some PTFE sheet on the way to give the metal washer version a go later :-)
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 02:58 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Lunatico Astronomical
Advertisement
Testar
Advertisement
Astromechanics
Advertisement
Astronomy and Electronics Centre
Advertisement