I've been in Mammoth for a few days now, and the skies are amazing here. I have also been wanting to do some star trail photos for a while, but marin doesnt have skies like mammoth. First night I tried, it turned out okay, but I needed a longer shutter (it was 45 min) and the foreground is not good. Last night I went up to Minaret Vista on top of the mountain. Shutter is an hour, and colors are real. Enjoy!