Pity I can't get good seeing conditions here; I'm rather annoyed with the weather pattern here in SA of late. Poor old Antares was jumping all over the screen.
Yes, I used a 2X barlow with a diagonal plus an extension tube, 1100 magnification is probably a rather reserved estimate.
This amount of mag really tests out the colimation! I spent well over 1 hour tweaking it. Still not perfect but close.
I got several AV's of jupiter (not at this mag) but could not solve the onion-ring problem even with 70% gain & 45% gamma...I don't understand, but it is what it is; deleted 'em.