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Adam, very nice light-trails! What shutter-speed did you use? It looks like more than 30 sec.
It was 30 seconds at F/8. There was a lot of people going north (white head lights), and a handful going south (red lights). I looked over my shoulder and waited until I saw a large grouping going south and started the shot right as they were driving under the bridge I was standing on in an attempt to get a full streak of the red lights.
I liked this shot because of the full streaks, and the odd aberration of the white spots on the bottom left from where a car bounced and the lights hit the road.
I had tried a couple at F/2, but the foreground wasn't as out of focus as I wanted, essentially it was the same as F/8, but a tad softer and with shorter light streaks. ISO 100 would have bumped the time up from 4 seconds to 8 seconds, but I would have needed to take a bunch of photos to get one with nice streaks. I did have a 10 stop filter along, to more fully test out the F/2 option, but once the cop came, I figured it was time to call it quits for the evening.
The F/2 shot does clean up a bit with some work in Capture NX2. 2 layers of Unsharp, one focusing on the clarity (4, 97, 0), next on sharpening (19, 20, 10), then a third Highpass sharpening layer (1.91, overlay, 45%).
Good to know how our lenses perform, and how to get the most from them.