Hi Scott,
Thanks
Yes it was at f3.5. I tested it on a tripod about three weeks ago but haven't had time or clear skies to try it up until last night. I'm pretty happy with the performance of the lens. This is a slight crop, but the edges aren't too bad. Some IP starsize reduction therapy didn't go astray either. Focusing is a little tricky. True focus is not at infinity and with the UHC-S filiter taped on the end, the view finder was pretty dark. I ended up using several test shots. This is what I do with my SN10 as well. An external monitor helps the process too. I can usually get focus in about 5 min. I've tried Paul Mayo's Sirius companion method, but I failed miserably.
Cheers