drop your ISO to 100 and f-stop to about 10ish then put your camera on a tripod and use a remote to trigger the shutter. if you don't have a remote then set the self timer and hit the shutter button then step back and wait for the camera to finish the exposure.
reason i say use a remote or the self timer is because a lot of people, myself included, tend to move the camera just a bit when they press the shutter button some times so best to be safe than sorry.
