Duncan, Paul, Leon, Keith, Stuart, Mark,
Thanks, guys!
Stuart, I did something silly and applied some deconvolution to the image (never applied deconvolution in the past; first light, some mistakes, etc) hence the weird stars. Will be careful in future not to apply to an individual exposure.
Mark, I knew you had the same setup! I'm hoping that because I don't have any plans to move to the 8-filter wheel system, that the RoboFocus should do the job just fine. Thanks for the heads up, though!
Cheers, all.
H