Make your room as
dark as possible, arrange everything and follow these instructions:
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With lights on, focus your camera, which stands on a tripod, and turn auto-focus off, it has no function in the dark.
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Find the first frame with your laser pointer and remember how it looks.
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Make a photo with the lens opened for about 20 seconds, depending on your animation.
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Trace the picture with the laser pointer carefully. My hand had a great talent in covering what I was drawing.
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Observe the result and delete it if it's crappy, or you will later have difficulties to sort the frames.
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Move on to the next frame and repeat step 2-5.