Camera set to shutter priority. Set it to (BULB). Which will let you click once to open shutter and once again to close shutter. Open shutter just prior to burst then count, one one thousand, two two thousand, three three thousand, click to close shutter. Preview shot, to see if you may have to leave shutter open longer. I use camera on a tripod, telephoto lense, take VR off, as I find it creates noise searching for noise. I also use a wireless remote, to help eliminate camera movement. ISO set to 50, or 100 will do also.
Michael