This image was created by stitching 3 separately photographed shots, all shot hand held from the rooftop bar Rio, slightly north of the strip. Normally, I would use my tripod and would shoot at, say, f/8 to f/11 at iso 100. But since the bar officials did not allow usage of a tripod, I had to bump up the iso to 800 and shoot wide open at f/2.8 to gain enough shutter speed to be able to handhold. 1/20 second at 55mm was still tough particularly considering the fact that I wasn't just wasting my time at the BAR :-). But fortunately, the pictures turned out to be just about ok.