In an earlier attempt to photograph The Beehive in Maine's Acadia National Park under moonlight I used a relatively short exposure so the stars don't appear to move, they are just dots in the sky. I decided that I wanted to make a photograph with light from the moon and star trails; since Acadia is twelve hours away I made a trip with friends Dan O, Dan K, Marty, and Bob to Chimney Bluffs. Initially it appeared that the trip might be a bust since there was very thin cloud cover, almost a haze, that I believed would make the contrast between the stars and the sky too low. However one of the lessons I've learned (and it took me a long time to learn) is that you follow through with the plan because even if everything doesn't seem perfect there can be unexpected success.
In my previous test photo I found that setting the camera to ISO 1600 with a 30 second exposure at f2.8 would yield day-like results for the parts of the picture lit by the moon. I set the camera for that exposure and began making successive exposures ending up with 83 photos (about 45 minutes).
For post-processing I used Canon's DPP application to create 83 rendered images for the sky and 83 rendered images for the ground from the RAW files. The ground and sky used slightly different parameters during rendering, I wanted the sky to be slightly darker and the ground a little lighter. I used my homemade "stacking" program to sandwich each of the sets of 83 together so that I ended up with a single final image for the ground and for the sky.
In Photoshop I combined the two images together. Then used a third image for the photographers in the lower right.