Once you are out in the field shooting at night; in addition to one's tripod to steady your shot, try setting your camera in the pre-lock up the mirror mode.
Most modern DSLR's have this function buried somewhere in one of the sub-menus. This, coupled with setting your camera's timer, helps your long exposure shots by minimizing any vibration caused when you press the shutter release and DSLR mirror flips up causing movement prior to the exposure.
Therefore, even though your camera is on a tripod, pressing the shutter release does cause camera shake and show up as blurring spoiling what you had hoped to be your crisp, in focus rendering of a night light scene.
Moreover, this is also why I use the timer as well. By using The delay in the shutter release it allows time for the camera to steady itself before the exposure takes place.
Lastly, if one is out on the street or walkways, shooting near auto traffic, the passing cars can also cause vibration and show up on your long exposure shots as movement even though you have followed the above suggestions. Wait for a red light and shoot quick... just so you know.
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