f2.5 for 5 secs, ISO 3200; colours were whack (the 28mm for long exposures gets all orange-y... annoying!) so it was adjusted in Lightroom - essentially auto WB, knock down exposure a stop, blacks -100, darks on tone curve -60. It's hard to get stars in focus with no lights to see the focal distance, and with a lens hood as the tripod to prop it up
Ahh ok thanks!