Cheers Greg, I took the settings in this
web page for hubble colours and fixing stars and put them into actions. I think I might have run the star fixer before I finished stretching this one, it normally works pretty well. I don't mind Ha as green, although lagoon is striking, but yellow, if you swap them around. Getting enough info out of S2 and O3 to match it is the real problem. Ha seems to have all the detail in this one, S2 and O3 look like mist.
Cventer, what's an STF? A filter wheel?
Cheers Carl.
Might get another little go at it tonight by the looks, but a cooled camera seems to attract thick clouds around here lately