Digital Camera Glossary - ISO Setting

Indicates how sensitive a film is to light. The higher the rating, such as 400, the more sensitive to light. Although ISO was developed for film cameras, as a rating system for light sensitivity, the terminology is also used by digital cameras. Mid range cameras might have a 100 ISO setting. The higher end camera may have a range from 50 to 400 or even more. For a more in depth look at ISO settings, read our ISO tutorial.