Canon EOS Rebel T2i/550D Setting Up page 4

smaller sensor size of the T2i/550D. The red mark on the lens mount is for Canon
EF lenses. EF lenses can be used on any Canon EOS camera. Just set the lens on
the lens mount and line up the white or red mark on the lens barrel with the same
color mark on the lens mount, and then turn the lens to the right to attach it.
Built-in fl ash. The fl ash provides illumination either as the main light source or
as a fi ll fl ash. In Basic Zone shooting modes such as Full Auto, Portrait, and so
on, the fl ash fi res automatically. In Creative Zone shooting modes including P,
Tv, Av, M, and A-DEP, you have to press the Flash pop-up button to use the
built-in fl ash.
Red-eye reduction/Self-timer lamp. When you have Red-eye reduction turned
on, this lamp lights to help reduce the size of the subject's pupils to minimize
the appearance of red-eye in the fi nal image.
Top camera controls
Controls on the top of the camera enable you to use your thumb and index fi nger on
your right hand to control common adjustments quickly. Here is a look at the top of
the camera.
Focal plane mark. This is the point from which the lens' minimum focusing
distance is measured.
Hot shoe. You can mount an accessory Speedlite fl ash unit here to provide com-
munication between the fl ash and the Rebel.
Mode dial. Turning this dial changes the shooting mode. Just line up the shoot-
ing mode you want to use with the white mark beside the dial.
Power switch. This button switches the camera on and off.
ISO speed button. Pressing this button displays the ISO speed screen on the
LCD so that you can change the ISO setting, which determines the sensor's
sensitivity to light. In P (Program AE), Tv (Shutter-Priority), Av (Aperture-Priority),
M (Manual), and A-DEP shooting modes, you can select Auto ISO to have the
camera automatically determine the ISO from 100 to 6400, or you can set the
ISO yourself. In all automatic shooting modes such as Portrait and Landscape,
the camera automatically sets the ISO between 100 and 3200. Alternately, you
can set the highest ISO setting that the Auto ISO option uses. You can also turn
on an additional high ISO setting, equivalent to 12800 by setting Custom
Function I-2.
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Canon EOS Rebel T2i/550D Digital Field Guide