Canon EOS 7D - Manual (Page 65)

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i : Setting the ISO SpeedN
If the ISO speed is set to “A” (Auto), the
actual ISO speed to be set will be
displayed when you press the shutter
button halfway. As indicated below, the
ISO speed will be set automatically to
suit the shooting mode.
*1: Depending on the maximum ISO speed that has been set.
*2: If fill flash results in overexposure, ISO 100 or a higher ISO will be set.
*3: If the shooting mode is or fully-automatic (1/C) and bounce flash is
used with an external Speedlite, the ISO speed will be set automatically within
400 - 1600.
For ISO Auto, you can set the maximum limit within ISO 400 - 6400.
Under the [y] tab, select [ISO Auto],
then press <0>. Select the ISO speed,
then press <0>.
ISO Auto
Shooting Mode ISO Speed Setting
1/C/d/s/f/a Automatically set within ISO 100 - 3200 *1
F Fixed at ISO 400
With flash Fixed at ISO 400 *2*3
3 Setting the Maximum ISO AutoN