Canon EOS 550D, EOS REBEL T2i AUTO, ISO speed, ISO Speed Guide, Set the ISO speed, Press the <Z> button. (9)

Z: Changing the ISO SpeedN

Set the ISO speed (image sensor’s sensitivity to light) to suit the ambient light level. In the Basic Zone modes, the ISO speed is set automatically (p.63).

1

2

ISO Speed Guide

Press the <Z> button. (9)

X[ISO speed] will appear.

Set the ISO speed.

Turn the <6> dial or press the

<U> key to select the ISO speed. You can also set the ISO speed in the viewfinder while turning the <6> dial.

With “AUTO” selected, the ISO speed will be set automatically (p.63).

ISO Speed	Shooting Situation	Flash Range
	(No flash)
100 - 400	Sunny outdoors	The higher the ISO
400 - 1600	Overcast skies or evening time	speed, the farther the
		flash range will be (p.64).
1600 - 6400, H	Dark indoors or night

In the [7 Custom Functions (C.Fn)] menu, if [Highlight tone priority] is set to [1: Enable], ISO 100 and “H” (equivalent to ISO 12800) settings cannot be set (p.194).

Using a high ISO speed or shooting in high-temperature conditions may result in more grainy images. Long exposures can also cause irregular colors in the image.

When you shoot at high ISO speeds, noise (banding, dots of light, etc.) may appear.

In the [7Custom Functions (C.Fn)] menu, if [ISO expansion] is set to [1: On], “H” (equivalent to ISO 12800) can also be set (p.192).

62