Sealife DIGITAL FLASH manual VIII. Glossary

VIII. GLOSSARY

ISO. International Standards Organization. This term ISO relates the ability (speed) of the camera’s sensor to accept light. Higher the ISO the more sensitive the camera is to light resulting in a brighter, but more grainy image.

Exposure Value (EV). EV setting controls the camera sensitivity to light. A positive EV means a brighter photo, while a negative EV will produce a darker image.

Pre-flash. Most digital cameras have a preflash to assist in auto- focus/autoexposure setting of the camera. These brief, flashes can errantly trigger an external flash before the camera captures the image.

Aperture. Like the pupil of your eye, this is the opening behind the lens that permits light to pass through the lens and on to the camera’s sensor. An aperture of f2.8 is a larger opening and allows more light to reach the camera’s sensor. f8 is a small opening and allows less light to reach the camera’s sensor.

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