[SusanH1970]

Originally Posted by Japaslavian

That isn't 100% correct. A higher ISO is more sensitive to light, so it would take a shorter shutterspeed in dim light, but the higher it is, the more noise you're going to get. If they are using a tripod and remote as you said earlier, you would want to keep the ISO as low as possible, because night shots are often times synonymous with noise, and shutterspeed won't matter because you're not hand-holding the camera.
You really only want to raise your ISO in situations where you can't use a tripod, or subjects are moving.

Or you have a strange affinity with noise...

Ah....good point! Thanks for correcting me.