Fog on the Headlands, photo by Harold Davis. View this image larger.

On a brilliant, sunny autumn afternoon Mark and I left the Tennessee Valley parking lot. Past the horse barns we climbed the Old Springs Trail to the Miwok Trail. We followed the Miwok Trail to the Wolf Ridge Trail, and then headed for the heights facing the ocean as the sun set into a fog bank. Two minutes later we were surrounded by fog as well. We made our way back down the trail in a thick fog and gathering dusk. The fog opened once for a few seconds in the twilight to give this view of Mount Tamalpais across Tennessee Valley.

[Nikon D300, 18-200mm VR zoom lens at 31mm (46.5mm in 35mm terms), four exposures combined in Photoshop (1/3 of a second, 1 second, 2 seconds, and 4 seconds) at f/5.6 and ISO 100, tripod mounted.]