Canon EOS 350D Rebel XT Guide

Av Aperture Priority AE

In this mode, you set the desired aperture and the camera sets the shutter speed automatically to suit the subject brightness. This is called aperture-priority AE. A larger aperture opening lower f number will result in a blurred background ideal for portraits. This occurs because a lower f number decreases the depth of field range of acceptable focus . On the other hand, a smaller aperture opening higher f number will make more of the foreground and background fall within acceptable focus. A...