Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 77)

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Set the ISO speed (image sensor’s sensitivity to light) to suit the
ambient light level. In Basic Zone modes, the ISO speed is set
automatically (p.78).
1
Press the < WZ> button.
X [ISO speed] will appear.
2
Set the ISO speed.
Press the < U> key or turn the
<6> dial to select the desired ISO
speed, then press <
0>.
With [AUTO] selected, the ISO speed
will be set automatically (p.78).
ISO Speed Guide
* High ISO speeds will result in grainier images.
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
extend (p.88). 400 - 1600 Overcast skies or evening time
1600 - 6400 Dark indoors or night
Under [7 Custom Functions (C.Fn)], if [5: Highlight tone priority] is
set to [1: Enable], ISO 100 cannot be selected (p.220).
Shooting in high temperatures may result in images that look grainier.
Long exposures can also cause irregular colors in the image.
When you shoot at high ISO speeds, noise (banding, dots of light, etc.)
may become noticeable.
Under [7 Custom Functions (C.Fn)], if [9: Flash button function] is set
to [1: ISO speed], you can set the ISO speed with the <D> button.
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