Canon EOS50D EOS 50D Instruction Manual - Page 96
Aperture-Priority AE
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f: Aperture-Priority AE In this mode, you set the desired aperture and the camera sets the shutter speed automatically to obtain the correct exposure suiting the subject brightness. This is called aperture-priority AE. A higher f/number (smaller aperture hole) will make more of the foreground and background fall within acceptable focus. On the other hand, a lower f/number (larger aperture hole) will make less of the foreground and background fall within acceptable focus. * stands for Aperture value (aperture opening). Blurred background (With a large aperture opening) Sharp foreground and background (With a small aperture opening) 1 Set the Mode Dial to . 2 Set the desired aperture. While looking at the LCD panel, turn the dial. 3 Focus the subject. Press the shutter button halfway. X The shutter speed is set automatically. 4 Check the viewfinder display and shoot. As long as the shutter speed is not blinking, the exposure will be correct. 96