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This is the White Dome Geyser in Yellowstone. It's right next to the Great Fountain Geyser. Once the moon came up and lit up the area I stopped shooting at the Great Fountain and went to leave. The road goes by White Dome Geyser and the large bright moon was really lighting it up, so even though it was around 2am or so, I decided to stop and shoot.
Now this one is cool because it can errupt every 12 to 24 mins. I shot it for almost an hour worth of shots, doing 30 second long shots with the remote release locked in. In the end, I took 25 minutes of shots and stacked them in Startrails, a free PC program that stacks very nicely. I chose a period where White Dome was just errupting and then at the end where it was just finishing towards the end of the 25mins. When I stacked the whole almost an hour worth of star shots, the geyser actually just blended away with the stacking, only a wisp of steam left. With this one, the only images used are the stacked ones, I didn't add a composite of the geyser afterwards. Now I did use a layer mask so that I could adjust the ground separately from the sky and stars. With the moon sooo bright, I actually had to pull back on the exposure from the ground layer quite a bit, otherwise it was actually lit like it was bright daylight, not like it was a night shot.
All thoughts and comments welcome.