Hi Peter,
Thanks for the detailed response - much appreciated. In your experience with the ONAG, have you found that there are any limitations in the objects you can image using the ONAG because of the lack of NIR going to the imaging camera?
In reading up more on ONAG's today, I also came across Scott Rosen's website (
http://www.astronomersdoitinthedark.com/index.php) and he has taken some pretty impressive pictures with his ONAG.
Cheers,
Mark