Canon 550D - Manual (Page 62)

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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
Press the <Z> button. (9)
X [ISO speed] will appear.
2
Set the ISO speed.
Turn the <6> dial or press the
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 Guide
Z : Changing the ISO SpeedN
ISO Speed
Shooting Situation
(No flash)
Flash Range
100 - 400 Sunny outdoors
The higher the ISO
speed, the farther the
flash range will be (p.64).
400 - 1600 Overcast skies or evening time
1600 - 6400, H Dark indoors or night
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).