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I have a Canon so this may not help you...while you're in Manual mode, increase the exposure length as far as it goes, and then usually after the longest (30s for Canon) it will probably change to "BULB".
Note that you'll want some way of remote controlling the shutter on your camera then, as you pushing the buttons will introduced blur vibration blur into the shot. Take a look into an intervalometer (timer remote) and/or computer control.
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