- APERTURE: device on the camera that opens and closes to control how long the focal plane is exposed to light
- SPEED: unit of measurement which determines how long shutter remains open as the picture is taken
- the slower the shutter speed, the longer the exposure time
- shutter speed and aperture together control the total amount of light reaching the sensor
- DEPTH OF FIELD: amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in a photograph
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