This is a photo of the Mequite Flat Dunes in Death Valley National Park in eraly morning light, highlighting abstract patterns on the sand with much contrast. I used a Nikon D 7100 and Nikkor Zoom Lens (18-200 mm.), using a Gitzo Tripod and Arca-Swis Head, and Hoya Circular Polarizer. The ISO was 200 F/18, 1/60th second exposure, and focal length of 44 mm.