This image of Thor's Well in Oregon is a composite of 4 photos to simulate a longer exposure as I did not have my Lee ND filter set with me. It was taken at high tide with a tripod as the sun was setting to the west. Captured with a Canon 5DIII; Canon 24-105L; ISO 400; f/5.6; 24mm; 1/800 second. The main challenge was keeping the tripod steady as the surf surged in and out.