thanks all.
Mark and Marcus I did mask the core with 30 second exposures. Not sure why the core turned out blue. Might reinvestigate this once I have sorted the remaining data. Marcus I toned down the brightness of the mask and this might be what is making it look a little dull.
Mardy you are more than welcome to approach me at the meetings. Being vice president I am approachable on any matter relating to ASSA also. In terms of imaging I will help where I can.