Using a single Nikon with 50 mm lens focused on infinity, I shot once, cocked the lever and shot again, as the small commuter plane was cruising between Portland and Seattle. The Northwest provides ample opportunities to photograph clouds but I was lucky to be sitting on the shaded side of the plane that morning with the sun behind the camera. Film: 400 ASA Kodak Gold. Commercial printer. Prints mounted on acid-free paper.