Using Laser Pointer from CNI to Draw Pictures and Write Letters!

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How to use a laser pointer to draw, to write and to record it? I think it is a very interesting thing. With...
How to use a laser pointer to draw, to write and to record it? I think it is a very interesting thing. With the help of a camera with the function which could set longer exposure time,you could easily record what you draw and write with the laser pointers.
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