#1  
Old 05-03-2017, 05:52 PM
dbowie's Avatar
dbowie (Brenton)
Its just lens fever....

dbowie is offline
 
Join Date: Apr 2016
Location: Port Lincoln
Posts: 115
Duncan mask

Hi anyone here used or using the Duncan mask method for SCT collimation, any hints, advice on design etc, seems to be pretty open ended, chrz
Reply With Quote
  #2  
Old 08-03-2017, 10:38 AM
billdan's Avatar
billdan (Bill)
Registered User

billdan is offline
 
Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,346
Hi Brenton,

I have done collimation with a Hartmann mask for my Newt, but found a barlow laser method easier and more accurate.

I do have this pdf on the Duncan mask though.
Attached Files
File Type: pdf collimation_duncan mask.pdf (45.5 KB, 80 views)
Reply With Quote
  #3  
Old 08-03-2017, 05:36 PM
Troy's Avatar
Troy
Mars 2010

Troy is offline
 
Join Date: Feb 2008
Location: Hunter Valley
Posts: 919
The Duncan mask is a good starting point for defocused collimation especially if you don't know how far to defocus the telescope before starting the collimation process.
For best results always collimate with a focused star
Reply With Quote
  #4  
Old 08-03-2017, 09:02 PM
dbowie's Avatar
dbowie (Brenton)
Its just lens fever....

dbowie is offline
 
Join Date: Apr 2016
Location: Port Lincoln
Posts: 115
Mask

Ok thnx for replies Ive collimated my C8 and 9.25 just using out of focus star with no probs but I spotted the Duncan mask on several other forums and thought an IIS member perspective would be good and perhaps a few people here might have been interested in the concept. Just found this, (http://www.iceinspace.com.au/index.p...63,187,0,0,1,0)
I see the Hartman is along the same lines. Im gonna make one anyway and try it, thnx..
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 07:18 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
SkyWatcher Australia
Advertisement
OzScopes Authorised Dealer
Advertisement
NexDome Observatories
Advertisement
Celestron Australia
Advertisement
Meade Australia
Advertisement
Lunatico Astronomical
Advertisement
Astronomy and Electronics Centre
Advertisement