嘉峪关 明代烽火制度 smoke signalling system to communicate on the size of invasion

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Photo details

  • Uploaded on June 29, 2011
  • © All Rights Reserved
    by Percy Tai 漆園童
    • Camera: Canon PowerShot SX30 IS
    • Taken on 2011/06/04 15:43:12
    • Exposure: 0.077s (1/13)
    • Focal Length: 15.33mm
    • F/Stop: f/4.000
    • ISO Speed: ISO200
    • Exposure Bias: 0.00 EV
    • No flash

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