Glossary of Digital Photography Terms: Definitions

Aperture of the lens – adjustment of the “iris”, which controls the amount of light entering the lens. Auto-focus – the selection of a point in the imaging frame upon which the auto-focus system will attempt to focus. Depth of field (DOF) – is the distance in front of and beyond the subject that appears to be in focus. Film speed – is the measure of a photographic film’s sensitivity to light. Image noise or Film grain – is a random, usually unwanted, fluctuation of pixel values in an image. ISO – on film cameras it’s an indicator of the selected film speed on film cameras, on digital cameras it’s an indication of the imaging chip’s light sensitivity. Motion blur – is the apparen’t streaking of rapidly moving objects in a still image. Shutter speed – adjustment of the speed of the shutter to control the amount of time during … Read more

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