Carl - First thought: Your going to want a good depth of field if you're looking at a row of lamp-posts. So you're wanting to be down at f8/f11. But, do you want to lamps to have starburst on them? If so, then you want to get further down, even as far as f22.
1)
What I want to capture is the cone shape that the lights are forming in the fog along with the lamps and post. It is a sharp curve in the row and then they straighten out. It is hard to describ what I saw if only I had a picture of it.
Yes, every lens has its 'sweet spot' the setting at which it supposedly performs at its best. But for our practical purposes, the demands of achieving the artistic goal should over-ride that particular consideration.
2)
Point taken.
If we're talking about it being dark, then we're possibly talking about a very, very long exposure. But, what's to be showing in the image. Is it just the lamps and the lamp-posts, with everything else gone to black? Or are we to see detail in the background?
3)
If memory serves me right I remember seeing some outlines of trees in the background. The only thing that seemed to hold the lights back was the fog. On a clear night or morning the lights are very bright.
I don't think the ISO setting is so important. What is important is getting the exposure right so that you don't have the dark areas full of noise. So, don't think of taking lots of lots of images. Instead maybe think of taking a few very long exposure shots (we could be talking many minutes here - Colin is the best person I know to comment on this).
Does that sort-of help?