Olympus Camedia C-3040Zoom Instructions Manual page 104

Locking the ISO value (ISO setting)
The ISO settings are based on the film speeds used in conventional
photography and are only intended as a guide.
If you select "AUTO" and then set the Mode dial to "A/S/M", the ISO value
is set to 100.
When you select "AUTO", the camera automatically selects a higher
ISO setting if you take a shot in low-light conditions without the flash.
This is to prevent blurring due to camera shake.
Higher ISO settings give increased graininess (noise) in the image.
Unless you select "OFF" in the "ALL RESET" setting (P.175), this setting will
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be cancelled when you switch the camera off.
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