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Star trails (enlarge plz)

My first attempt to capture star trails, not too bad I think :)

This picture is a composition of 40 individual pictures composed in Photoshop. Each picture is taken at ISO 100, f/5.6 and 180 seconds for shutter speed. This final composition shows a total period of 120 minutes of star trails. Unfortunately two pictures are lost and the consequence is seen as two breaks in the final picture.

As Tehran is mega-city its light is too much to let more stars to be visible, therefore, only the most bright stars can be seen and lots of faint stars are absent.

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Photo details

  • Uploaded on September 3, 2012
  • © All Rights Reserved
    by H. Lotfi-Azad
    • Camera: NIKON CORPORATION NIKON D5100
    • Taken on 2012/08/20 21:38:32
    • Exposure: 180.600s (1/0)
    • Focal Length: 18.00mm
    • F/Stop: f/5.600
    • ISO Speed: ISO100
    • Exposure Bias: 0.00 EV
    • No flash