Processing:

-Five 5 minute images converted to tiff and dark corrected using Paint Shop Pro.
-Stacked and flat field corrected using Maxim DL
-Image streteched and masked layer approach used to maintain detail in bright areas
-Noise reduction using Paint Shop Pro
-Negative gradient fill and soft focus combine used to correct colour balance
-Final sharpen using Focus Magic (a Photoshop and Paint Shop Pro plugin)