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Hi Suzy, being limited to a tripod, try 800 ISO and shoot with lens wide open. With the lens at 18mm you should be able to use (at a guess) 40 second exposures without any trailing and shorter as you adjust the lens to 35mm, perhaps 20 seconds. The warmer the night the more noise will show up in the exposure. If the night time temp. is above 15 degrees, 800 ISO would be the best. If the night time temp gets down to 10 or less you could try ISO 1600.
In camera noise reduction will help also to reduce noise. I presume this model camera would have that setting in the menu.
All the best.
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