Digital SLR Camera Basics

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image sensor

A device that converts light (i.e., images) into electronic signals. Image sensors are composed of micro-lenses for maximum light concentration, color filters that split light into separate color signals, photodiodes that convert light to electronic signals, transmission circuits that transmit these signals, and additional circuits that convert the signals to digital data.

image sharpening

A function that controls the sharpness of outlines in photographs.

image size

The dimensions of an image in pixels. Sometimes stated using abbreviations such as “L” (large), “M” (medium), or “S” (small).

ISO sensitivity

A measure of a digital camera's responsiveness to light. Doubling this value doubles the camera's sensitivity to light.

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