Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 31-07-2022, 07:47 PM
Saturn488
Registered User

Saturn488 is offline
 
Join Date: Dec 2018
Location: Melbourne
Posts: 358
OAG with small refractors?

Trying to adapt a ZWO OAG to a small 60mm refractor but unsure if it will be suited or not. Are OAG's better with longer or shorter focal length telescopes?
Reply With Quote
  #2  
Old 01-08-2022, 10:25 AM
Craig_
Registered User

Craig_ is offline
 
Join Date: May 2020
Location: Sydney
Posts: 307
I've not used an OAG on a 60mm refractor, but I can't see why it wouldn't work. I've used them on 80, 90 and 120mm refractors with good results. IMO OAG is far, far superior to a guide scope in terms of guiding performance (at least I have gotten consistently better results with OAG) and this has been independent of aperture/focal length. Obviously OAG can sometimes have an issue of not being able to find a guide star, but I'd suggest this is not likely to be an issue on a 60mm refractor and certainly has never been on any of mine. YMMV of course.

OAG is traditionally recommended for long focal lengths, but that doesn't mean it can't or won't work with shorter FL. Indeed, I find it works much better.
Reply With Quote
  #3  
Old 07-08-2022, 10:38 AM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,937
I can say I'll never go back to a guide scope with any scope over 70mm in diameter. I have used an OAG with an FSQ106 and found it easy to setup. Guiding then is devoid of differential flexure. Even a 60mm scope would work with this solution. Just watch out for the image circle. You'll need enough room to allow the prism to be in the image circle and to be out of the way of the sensor. That will not likely be possible with a large sensor. It would then be the only time you would need to use a guide scope.
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 11:09 AM.

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