I was driving along the Blue Ridge Parkway before daybreak. It was just light enough to make out the moutain mist lying in the valleys. I couldn't wait for sunrise because I was on a schedule that wouldn't allow it. So, I pulled over to the side of the road and used my camera on a tripod because of the low light. I had ISO 100 slide film in the camera, and estimated a 5 - 10 second exposure to get something reasonable on film. I'm sure the colors that were recorded include a fair amount of reciprocity effect.