http://photography.tutsplus.com/articles/50-stunning-slow-shutter-speed-images--photo-476
In this photo, the photographer must have used a very slow shutter speed to be able to draw all the light figures with such detail and not show up at all in the background. He may have used a shutter speed of at least 30 seconds and a very small aperture so as not to over expose the photo. Some technical difficulties the photographer may have faced are blocking anyone from walking in the background in the public space and making sure the light reflecting off the metal ramp was not dominating the photo.
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