Thanks guys,
Martin the sub exposures were 20 minutes on Luminence and Ha and 15 minute subs on the colours. Running the camera at -15C. Ha was combined with the Lum in CCDstack rather than layer masking in PS. Star control with layer mask and minimum filter with an opacity of 37%. Any more than that the stars start to get faint streaks and join stars nearby. Very little saturation added too.
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