ISO is the unit used to measure and adjust the camera sensor’s sensitivity to light. With film, the ISO setting (or film ‘speed’) is part of the film’s physical and chemical properties and can’t be changed. With digital cameras it’s possible to ‘turn up the volume’ on the sensor to make it more sensitivity to […]
On simpler cameras the Auto ISO option simply increases the ISO setting in poor light to keep shutter speeds high enough to avoid camera shake. On more advanced cameras you can program in both the maximum ISO you want to use and the minimum shutter speed, which makes Auto ISO much more useful.