Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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The ISO speed is a numeric indication of the sensitivity to light. A higher 
ISO speed number indicates a higher sensitivity to light. Therefore, a 
high ISO speed is suited for low light and moving subjects. However, the 
image may look more coarse with noise, etc. On the other hand, a low 
ISO speed is not suited for low light or action shots, but the image will 
look finer. 
The camera can be set between ISO 100 and 1600 in 1/3-stop 
increments. 
1
Hold down the <
E
> and <
Q
>
buttons simultaneously. 
s
The current ISO speed will be 
displayed on the LCD panel. 
2
Turn the <
6
> dial. 
¡
Turn the <
6
> dial until the desired 
ISO speed is displayed on the LCD 
panel, then let go of the buttons. 
s
The ISO speed will be set. 
Under the <
z
> tab, set [ISO
expansion] to <On> to enable ISO 50 or 
3200 to be set. When set, ISO 50 is 
indicated by 
L
 and ISO 3200 by 
H
.
Setting the ISO Speed
ISO speed extension
¡
At higher ISO speeds and higher ambient temperatures, the image will 
have more noise. 
¡
High temperatures, high ISO speeds, or long exposures may cause 
irregular colors in the image.