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Personally, I swear by Camera 360 app cos it almost erradicates problems like this. .

hang on, ISO is the settings that configures how much light is picked up right? so surely for blur-iness we should be trying to configure something like shutter speed? does this camera 360 do that?
By increasing the ISO number you increase the sensitivity of the camera sensor to light, i.e. more light is picked up.
Picking a higher ISO compensates for shutter speed in a way that it shortens the shutter speed.
For example,
a blurry photo: ISO 200 - Shutter speed 1/40 th of a second
a normal photo with ISO doubled: ISO 400 - SHutter speed 1/80th of a second
