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| Double Exposure on film I shot both pictures on slide film with a professional 35mm SLR camera, the picture on the left using a 50mm lens set to F8 with a 1/60sec shutter speed and flash. It is actually 2 separate pictures shot on the same frame of film. I put my camera on a tripod, covered half the lens with black cardboard, set the camera on a 10sec timer, and positioned myself on one side holding the glass without moving it in order to keep it in the exact position for the next exposure. Then I repeated this with the second exposure where I was standing and holding the top part of the glass, careful again not to overlap the imaginary hand on the bottom. The reason you need to cover half the lens for each exposure because if you didn't you would effectively double the exposure for everything except yourself which you exposed only once on each side, thereby rendering the subject normal, but everything else very light. The hardest part of this procedure is positioning the cardboard on each side of the lens exactly in the halfway mark which is not in the centre of the lens because the centre is proportional to the depth of field which depends on the focal length of the lens and the appeture setting on the lens. You would see a white vertical line in the centre of the picture if the cardboard was short from the centre, and if it overlapped the centre you would see a black line instead. |
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