Changing The Iso Speed - Canon Xsi Instruction Manual

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.
ISO Speed Guide
ISO Speed
100/200
400/800 Overcast skies, evening
1600
About Auto ISO
This mode sets the ISO speed automatically between ISO 100 - 800 to
suit the shooting mode and ambient light level. For flash and <a>
(manual) exposures, ISO 400 is set. When you press the shutter button
halfway, the automatically-set ISO speed is displayed in the viewfinder
and on the LCD monitor.
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.
Under the [7 Custom Functions (C.Fn)] menu, if [Highlight tone
priority] (p.156) is set to [1: Enable], the settable ISO speed range will
be ISO 200 - 1600.
Press the <Z> button.
1
Select the ISO speed.
2
Normal (No flash)
Sunny outdoors
Night or dark indoors
[ISO speed] will appear.
Turn the <6> dial or press the
<V> key to select the ISO speed.
You can also look at the ISO speed in
the viewfinder while turning the
<6> dial.
Flash Range
The higher the ISO speed, the
farther the flash range will be.
(p.58)
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