Best results will come from using either the shutter delay timer, or a remote activation device for the shutter; manually depressing the shutter for a time delay (especially on "Bulb" setting) will cause the camera to move. Also do manual exposure, not automatic. Automatic will likely make the exposure too bright.
If you are shooting a night shot, expect the light meter to indicate the exposure is well underexposed. Automatic exposure tries to make every image to match a Grey Card. Bracket your exposure times and apertures and shoot LOTS of images.
Practice lots before you make an important shoot. If you can see light fixtures or light sources, they will certainly be over-exposed. If some elements are very dark in relation to your primary light source, you may want to supplement your natural lighting with a flash, portrait lights on a tripod, or even a flashlight.
The attached image was taken with a 30-second exposure at 11:30pm with the exposure set at F8 and ISO800. Area lighting from behind the camera was on for 5 of the 30 seconds. Pool underwater lights were on for about 15 seconds and I shined a flashlight at the water features in the lower right and up in the palms to the upper left for the full time, but kept the flashlight constantly moving so it did not burn in one spot.In order to get this one shot, I took about 30 exposures, playing with different times of having each light source on.
Hope that helps and HAVE FUN experimenting.
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