http://www.modulatedlight.org/optical_comms/optical_index.html
http://www.modulatedlight.org/optical_comms/Optical_enclosure_cheap_version.html
http://www.modulatedlight.org/optical_comms/optical_rx1.html
http://www.modulatedlight.org/optical_comms/Optical_enclosure_first_version.html#fine_adjustment
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