What are the key things to know about ISO?
Marcus Hawkins
Photographer and writer Marcus is a former editor of Digital Camera
There are three key camera controls that determine the exposure of a picture: aperture, shutter speed and ISO. The size of the aperture (the hole in the lens) dictates how much light enters the camera, with the shutter speed regulating how long the imaging sensor is exposed to that light. But it’s the ISO that determines how much light is required to make an exposure.
ISO essentially controls
