There was an eeries calm and fantastic light at the Oxbow in Grand teton National Park before the storm. I captured the scene with a Nikon D 7100, Nikkor Zoom Lens (18-200 mm.), with a Hoya Circular Polarizer. The ISO was 200, F/20, 1/8th second exposure, and a Focal Length f 62 mm. I used a Gitzo Tripod and Arca-Swiss Head