This is a photo of a storm over Bow Lake in Banff National Park in Canada. It was shot with a Nikon D 7100, Nikkor Zoom Lens (18-200 mm.), with a Hoya Circular Polarizer, at ISO 100, F/16, 1/10th second exposure, and a Focal Length of 18 mm. I used a Gitzo Tripod and Arca-Swiss Head.