+Stu Posted January 29 Share Posted January 29 Does a bigger guidescope improve guiding? I have a 32mm guidescope. I've got a couple of 50mm finders that could be used instead, would it make any difference? Link to comment Share on other sites More sharing options...
+Ibbo Posted January 29 Share Posted January 29 Not so sure nowadays with the guiding software been able to do sub pixel guiding I don't think it makes that much difference esp with our seeing. Having said that I did buy an ED 80 as a guidescope back in the day and if I think about it when using the OAG I have used 200 mm scope at 2000 mm focal length. +Stu 1 Link to comment Share on other sites More sharing options...
+Stu Posted January 29 Author Share Posted January 29 @Ibbo Fair enough, I've not had any guiding issues that weren't my own doing so will just stick with the 32mm. Link to comment Share on other sites More sharing options...
Clive Posted January 29 Share Posted January 29 It's the focal length that's important for guiding accuracy rather than the aperture. The resolution in arc-sec per pixel for the guide scope/camera combination should ideally be not be less than about 1/5 the resolution in arc-sec per pixel for the imaging scope/camera combination, the closer the better which is why OAG's are better for long focal length imaging scopes. +Stu 1 Link to comment Share on other sites More sharing options...
+Ibbo Posted January 30 Share Posted January 30 Main advantage of OAG IMHO is the removal of differential flexture. Link to comment Share on other sites More sharing options...
philjay Posted January 30 Share Posted January 30 Yep a focal length thing as well as guide cam resolution as Steve says. I used to image at f10 through a C11 but guide with a 127 mak at f12 very successfully with a pretty basic guide am in my early days of imaging. +Stu 1 Link to comment Share on other sites More sharing options...
+Ibbo Posted January 30 Share Posted January 30 You say you have not had problems so I would say leave that can of worms unopened +Stu 1 Link to comment Share on other sites More sharing options...
Bob Dobber Posted January 30 Share Posted January 30 39 minutes ago, Ibbo said: You say you have not had problems so I would say leave that can of worms unopened This. This is the very best advice anyone can give a fellow astrophotographer. One day I hope to listen to this advice myself 🙄 +Ibbo 1 Link to comment Share on other sites More sharing options...
+Ibbo Posted January 30 Share Posted January 30 22 minutes ago, Bob Dobber said: This. This is the very best advice anyone can give a fellow astrophotographer. One day I hope to listen to this advice myself 🙄 Me too Link to comment Share on other sites More sharing options...
+Stu Posted January 30 Author Share Posted January 30 1 hour ago, Ibbo said: You say you have not had problems so I would say leave that can of worms unopened Agreed Link to comment Share on other sites More sharing options...
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