I usually do urban night shots not long after sunset. It seems that if I wait too long, then the sky gets an ugly grey colour to it. Here is a crop of a shot on E100VS Readyload:
The uncropped version is included in my Transportation images. As best as I can recall, the exposure was around 2 minuntes 40 seconds.
Depending upon how far an object is away from the camera, you can sometimes cause a slight stop of motion by firing a strobe at the object. There will still be an indication of motion, since time exposures average out things moving across the scene. So while the bay was somewhat turbulent in this shot, the time was long enough to make it seem smooth; and that allows the light reflections to burn in more. It doesn't look this way when you stand where I took this shot.
Ciao!
Gordon Moat Photography
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