We made a test shot for a long exposure last night. This was taken at a high aperture setting on our camera, with an ISO of 400, a one stop polarizing lens and the shutter was only open for ten minutes or so. I was trying to guess the equivalency for a much longer period of time and see how much light pollution there would be. Next time we're hoping to keep the shutter open for several hours, so we're going to go later in the night so less cars drive by and illuminate the power station. We're going to bracket the exposure one stop on either side of f/18 (ISO 800?) and use a tripod (as opposed to the top of our car). Also, we're going to get through the power station rather than beside it.
Any other hints on how we should do this would be appreciated, because it would be kind of a bummer to spend so much time on a picture and come away with something lame.
-Robert
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