Mount Tamalpais, photo by Harold Davis. View this image larger.

With the shutter open for five minutes, my sensor picks up all kinds of ambient light on the slopes of Mount Tamalpais. Cars snaking their way up and down Panoramic Highway, houses on the ridge leading up to the peak, a red light on the summit, and the glow of ambient light from Mill Valley and other Marin cities reflecting on the mountain.

How different the landscape looks under the daytime sun.

Related stories: Mount Tamalpais from Euclid Avenue; Maserati and Mount Diablo; Digital Darkness; On Night Photography.