I use a Canon 50mm f/1.2, but will be similar enough. I must say I have not done it for a while, BUT...
Put it in manual mode, and select B. Change the aperture to around f/3.2, and the ISO to around 1600 or so (some use higher), and the exposure to 15 to 20 seconds. Any more, and the trailing is obvious if not using a tracking mount.
I tend to use my Canon 28-135 USM more often for these kind of shots though. A good lens.
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