Canon A70 - Manual (Page 115)

110
Changing the ISO Speed
Change the ISO speed when shooting in dark places or
when you want to shoot with a faster shutter speed. You
can choose from the following speeds: Auto, 50, 100, 200
and 400.
1
Press the button.
2
Select * (ISO Speed) using the up or
down button.
* The current setting is displayed.
3
Select the desired setting using the left or
right button.
You can shoot the image right after selecting settings by
pressing the shutter button. This screen will appear again,
once the image is shot.