Either ISO 1600 or 800, f/3.5 (widest my lens goes), 30 seconds. I took 60 shots and combined them in the free star trails software. I shot sets with both 800 and 1600 and don't really know which worked better?
I am just trying to recombine them in star trails - there are a lot of faint falling stars in various frames. Wish I could get them to show up better!