Buy a remote cord with a B ('bulb' setting) and fire and release the shutter manually.
Cheap as chips and will solve your problem. You should use this for automatic long exposures as well when tripod mounted and enable mirror lock up too. There is a 2second delay mirror lock up option in the menus somewhere as well which could be used for automatic long exposures which gives the mirror vibration a couple of seconds to settle before exposing the shot but i prefer using a release and having control over when the shot is taken and for how long.
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