My son ans I found the rock called Bonsai rock at Lake Tahoe a few weeks earlier but we did not have time to do a star travel sequence. I knew I wanted to return to get the job done. So my son and I did the drive, 2.5 hrs arrived at 11:30pm, much harder to find this unmarked location in the dark. We then took 45 2-min exposures and stacked then in PS5. I then took one 4min exposure, which my son used his flashlight to paint the rock and lake. The best part is the time spent with my boy!