While in the Bay Area for a few days visiting my sister and her family, I headed into San Francisco via BART on two of the days and just photographed on the street. As I had a tilt-shift lens with me the majority of the images taken on the first of the two days was with this lens as shown in the image below.
The tilt-shift lens lets you control the focal plane of the camera different than with a normal lens. This lens is commonly used for architecture in order to remove any converging lines you may get when photographing a building from below. In this instance I used the features of the lens to provide some selective focus for this cable car waiting to be turned around and head back to Market Street.