used a shutter speed of 15 seconds for each photo. I set the exposure mode to manual and used settings of ISO 400, f13 and 15 seconds throughout the shoot. This seemed to work well. The background was too bright in the first few images, so I darkened it in post-processing. In the last couple of photos the sky is almost pitch black thanks to the fading light. You'll get a dramatic image with a wide-angle lens. The first time Kathryn spun the wool I positioned the tripod well back so I could see where the steel wool was falling. Then for the next shot I moved the tripod forward so it was on the edge of the falling sparks. I stepped back from the camera after pressing the cable release (a remote would be even better) to avoid the sparks. I fitted the lens with a UV filter and lens hood so that the front element wouldn't be damaged if any burning metal hit it. I used manual focus. I focused on Kathryn before she started spinning the steel wool and let the small aperture take care of depth-of-field. As it got darker I couldn't see her clearly in the viewfinder, so I used Live View. In Live View the camera amplifies the image so you can see it more clearly on the LCD screen. You can also use the magnify button to zoom in on the spot where you want to focus. This makes it much easier to