Thanks guys, I will investigate this mapping of the bad columns a bit more. I might contact several of you for further information.
Mike, not early for sure. Over 12 months and this is the second image I have produced with the RC12. However now I will concentrate more on doing images with it. Several already in the mill and data being collected.
Rob, I have a Ha filter in the STL at present but might forgo getting any Ha for now. It might happen next year.
Pete not as sharp as yours. I checked and yours is sharper, no doubt to do with the optics and the AOL guiding.
Thanks all for the kind comments. Much appreciated.