Roost Tower in San Francisco, California

One of the watchtowers of Alcatraz - now simply a home for gulls.

Taken in San Francisco, California on Jun 26, 2010

Keywords Alcatraz the rock gull

Category Birds Trips

Camera

Canon EOS 7D

Lens

EF70-200mm f/4L IS USM

Aperture

F14

ISO

400

Focal length

200.0 mm

Program type

Shutter speed

1/64 sec

Exposure bias