Z: Changing The Iso Speed - Canon Rebel T2i EOS 550D 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 (p.63).
ISO Speed Guide
ISO Speed
100 - 400
400 - 1600
1600 - 6400, H
In the [7 Custom Functions (C.Fn)] menu, if [Highlight tone priority]
is set to [1: Enable], the settable ISO speed range will be ISO 200 - 6400
(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 [7 Custom Functions (C.Fn)] menu, if [ISO expansion] is set to [1:
On], "H" (equivalent to ISO 12800) can also be set (p.192).
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Press the <Z> button.
1
Set the ISO speed.
2
Shooting Situation
(No flash)
Sunny outdoors
Overcast skies or evening time
Dark indoors or night
[ISO speed] will appear.
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).
(9)
Flash Range
The higher the ISO
speed, the farther the
flash range will be (p.64).