That said, you don't just want a technically good camera—you want the right camera for you. Glossary of Camera TermsISO : ISO dates back to the film days when it was a standardized way of indicating how sensitive a film was to light. So setting your digital camera to 100 ISO should give you roughly the same base levels of brightness as 100 film speed. The lowest ISO on your camera is sometimes called the “base ISO.” So setting your digital camera to 100 ISO should give you roughly the same base levels of brightness as 100 film speed.