These photos were all taken handheld, with the Canon EF-S 17-55 f/2.8 IS on my EOS-50D. Exposures were at ISO 800 with the f-stop ranging from f/2.8 to f/3.5 and the shutter speeds from 1/5 to 1/15 second. This lens is amazingly sharp and the image-stabilizer is very effective so shooting in a city at night is feasible, even without a tripod.
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