How to Change Aperture Quickly on a 550D
You can use aperture-priority and manual shooting modes of Canon's 550D, also known as the Digital Rebel T2i, to help control the exposure of your pictures. With aperture-priority mode, you are setting the amount of light coming through the lens, also known as the f-stop, while the camera selects the correct shutter speed. In both this mode and when shooting in full manual mode, control the aperture setting using the camera's main dial. With practice, you will be able to change the aperture quickly while shooting pictures.
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Instructions
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Turn the mode dial, found on top of the camera, to "Av" for aperture priority or "M" for manual shooting.
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Spin the main dial, located in front of the shutter button, to change the aperture. Turn it to the right to choose a higher aperture setting and to the left for a lower setting.
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See your selection on the LCD panel. The aperture is displayed along the top line of type with an "F" in front of the number. It is also visible among the data contained in the viewfinder window.
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Tips & Warnings
The lens aperture controls the depth of field of an image. The lower the aperture, the more light coming into the lens and the more shallow the depth of field. This creates a blurry effect behind the main subject of a picture, as shown often in close-up photography. The higher the aperture, the less light allowed into the lens and the sharper the background.
Letting too much light into the lens and working with a slow shutter speed causes pictures to be overexposed. Conversely, using a little light and a fast shutter speed causes pictures to be underexposed.
