More than 100 graphic comparison pictures illustrate every point in this book and can help any photographer maximize the creative impact of his or her exposure decisions. Peterson stresses the importance of metering the subject for a starting exposure, and then tries to explain how to use various exposure meters and different kinds of lighting. The book contains lessons on each element of the exposure-aperature, shutter speed, iso - and how it relates to the other two in terms of depth of field, freezing and blurring action, and shooting in low light or at night. A section on special techniques explores such options as deliberate under - and overexposures, how to produce double exposures, bracketing, shooting the moon, and the use of filters. 'Understanding Exposure' aims to demonstrate that there are always creative choices about how to expose a picture - and that the decision is up to the photographer, not the camera.