Canon EOS 1Ds Mark III, Инструкция по эксплуатации

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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
Press the <
Z
> button.
(
9
)
X
The current ISO speed will be
displayed on the top LCD panel and
in the viewfinder.
2
Set the ISO speed.
Turn the <
6
/
5
> dial to set the ISO
speed.
Z
: Setting the ISO Speed
Using a high ISO speed or shooting in high-temperature conditions may
result in more grainy images.
High temperatures, high ISO speeds, or long exposures may cause
irregular colors in the image.
If C.Fn II -3 [ Highlight tone priority ] is set to [ 1: Enable ], the settable
ISO speed range will be ISO 200 - 1600. (p.164)
With C.Fn I -3 [ Set ISO speed range ], the ISO speed range can be
extended to ISO 50 (L) to 3200 (H). (p.158)