I did a test of various exposures last night.
This one worked out about the best.
15 minutes ISO200 (the lowest ISO on the Fuji XE1) at F4, 14mm lens.
The trees are from a 2nd short exposure untracked. There is also 2 hours of Ha added in from my Milky Way mosaic project.
http://upload.pbase.com/image/152153598
Greg.