First, I have done a search here and on the web and there seems to be arguments for CWB and against. The camera is a Canon 450D, full spectrum modified, and peltier cooled, and I generally run with a Baader uv/IR cutoff filter on the front. The camera is still set on AWB, and of course I get a lot of red seemingly everywhere I point it in the night sky.
Now some say, don't worry about it, just fix it in post-preocessing with auto colour correction (depending on app used of course).
Others say, shoot a grey card, in daylight and use that to create a custom while balance. But to my mind that is just doing a custom balance for daylight and maybe useless at night.
So how do I do a custom while balance for the night sky (usual targets are DSOs, nebs, etc)? Or am I wasting my time and should just fix it in processing?