Classic spiral staircase

Look closely at the iron work on this 17th century railing and you can see why it's called the 'Tulip Staircase'. This is in the Queen's House in Greenwich, England. I photographed it with various focal lengths, including a 15mm fisheye, but I liked the 24mm focal length the best. This is hand held, and my settings were 1/30, f/11, and 1600 ISO. I don't like using such a slow shutter speed when not using a tripod, but I had to have a certain amount of depth of field to make sure the beautiful railing as well as the spiral design near the ceiling were both tack sharp. I held my breath, planted my feet firmly on the floor, and squeezed the shutter gently to help make the picture as sharp as possible. I took this picture in 2013 with the Canon 5D Mark II when noise was still a serious consideration, so I didn't want to raise the ISO above 1600. The blue color comes from using a tungsten white balance.