Changing The Iso Speed For Stills; Changing The Iso Speed Range - Canon PowerShot G7 X Mark III Advanced User's Manual

Changing the ISO Speed for Stills

Set the ISO speed to [AUTO] for automatic adjustment to suit the shooting
mode and conditions. Otherwise, set a higher ISO speed for higher
sensitivity, or a lower value for lower sensitivity.
Although choosing a lower ISO speed may reduce image graininess,
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there may be a greater risk of subject and camera shake in some shooting
conditions.
Choosing a higher ISO speed will increase shutter speed, which may
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reduce subject and camera shake and enable sufficient flash illumination
for subjects farther away. However, shots may look grainy.
ISO speed can be set to H (25600) when [Maximum] for [ISO speed range]
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is set to [H(25600)].
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Changing the ISO Speed Range

You can set the manually-settable ISO speed range (minimum and
maximum limits).
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button → [ ] → choose an option
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[ ISO speed settings] → [ISO
speed range]
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