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.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EOS_1D_Mark_II/settingiso1.gif) |
1. Hold down the <AF> and < > buttons simultaneously.
- The current ISO speed will be displayed on the LCD panel.
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![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EOS_1D_Mark_II/settingiso2.gif) |
2. Turn the < > dial.
- Turn the <
> dial until the desired ISO speed is displayed on the LCD panel, then let go of the buttons.
- The ISO speed will be set.
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- 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.
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ISO Speed Extension
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/EOS_1D_Mark_II/settingiso3.gif) |
Under the < > 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. |