Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 92)

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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.93).
1 Press the <i> button. (9)
X
[ISO speed] will appear.
2 Set the ISO speed.
Press the key or turn the
<6> dial to select the desired ISO
speed, then press <0>.
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.93).
ISO Speed Guide
* High ISO speeds will result in grainier images.
i: 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.107). 400 - 1600 Overcast skies or evening time
1600 - 12800, H Dark indoors or night
Under [54: Custom Functions (C.Fn)], if [2: ISO expansion] is set to [1:
On], “H” (equivalent to ISO 25600) can also be set (p.298).
Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is
set to [1: Enable], ISO 100 and “H” (equivalent to ISO 25600) cannot be
selected (p.299).
Shooting in high temperatures may result in images that look grainier.
Long exposures can also cause irregular colors in the image.
COP
Y