Setting ISO speed using the PowerShot A3100 IS.

Article ID: ART105952 | Date published: 05/11/2015 | Date last updated: 08/15/2015


Raise the [ISO speed] to use a fast shutter speed when you wish to reduce the effects of camera shake or avoid blurry subjects, or to turn the flash off when shooting in a dark area.

  • The following explanations are provided based on the assumption that the [Shooting Mode] is set to [Program AE] ().
  • To set the [ISO Speed], it is necessary to set the [Shooting Model] to one of the following modes.

- [Program AE] (), [Long Shutter] () in the [SCN] () mode.

1. Press the <Power> button on the camera.

2. Press the <FUNC./SET> () button.

3. The following screen appears on the LCD monitor.

Operate the <directional buttons> to select an [ISO AUTO] ().

Operate the <directional buttons> to select an [ISO Speed]* of your choice.

After the settings are completed, press the <FUNC./SET> () button.

* The appropriate [ISO Speed] differs depending on shooting locations. If the camera shake warning icon () appears when you press the <Shutter Button> halfway, it is recommended to gradually raise the ISO speed in increments such as [ISO 80], [ISO 100], etc., and then set the [ISO Speed] when the camera shake warning icon () disappears.

Changing the ISO speed
Automatically adjusts the ISO speed to the Shooting mode and shooting conditions.
Fine weather conditions, outdoor shooting.
Cloudy, Twilight
Nightscapes, Dark interiors

4. If the following icon is shown, the setting is complete (if setting [ISO Speed] to 400).


  • Raising the [ISO Speed] increases the shutter speed and allows the flash to reach subjects at far distances. Therefore, it is possible to shoot images with less subject blur or camera shake even in dark places.
  • However, the higher the [ISO Speed], the more the noise stands out (more uneven areas in an image).
  • Lowering the ISO speed results in sharper images, but there may be an increased chance of image blurring in certain shooting conditions.



Rate this Article
Was this article helpful?
Yes, This document is helpful
No, This document needs a clearer explanation
Please provide your comments