I shot this one at Grand Prismatic Spring in Yellowstone National Park and was struck how this scene never quite replicates itself. This environment is constantly changing. I used a Nikon D 7100, Nikkor Zoom Lens (18-200 mm.), with a Hoya Circular Polarizer, all mounted to a Gitzo Tripod and Arca-Swiss Head.
The ISO was 200, F/25, 1/20th second exposure, and a Focal Length of 26 mm.