How long for light trails?
Experiment! There is no right answer… When there is a little bit of ambient light, you may need to go shorter or close down the aperture, as I did here. This one is F/14 at 5 seconds. Not that I knew that ahead of time… I had to experiment. When I did F/4 at 5 seconds, the whole thing was way too bright but the light trail was the right length, so I just darkened it up by increasing the F stop to F/14.
Daily Photo – London as Night Closes In
Here's one of those really fun long exposure shots that are readily available all over London. This is one of the great advantages of living in a big city is that you get all that crazy tail light action that I don't get here in Queenstown. It makes for a very fun way to be creative and try new ways to fill up the frame with unexpected light action.
I took this one during the big photowalk event — thanks again everyone!