Thanks, Mike. Yes, it was just about 35 minutes; I hope to get out tomorrow night, and I'll try M31 for a couple of hours.
Once I get a better handle on Star Tools and my exposure times, I'll do some direct comparisons with and without the tele-extender.
At some point I'll probably get either the 6D or the 7D modified--I sure like the results you get with that.
Cheers,
Henry