the amount of light reaching the camera’s sensor

practical uses

• opening the aperture increases exposure (but reduces depth of field)
• slowing the shutter speed increases exposure (but introduces motion blur)
• iso is sensitivity to light and works like gain
• adjusting one of these values of exposure will require compensation in one (or both) of the other two values to maintain the same level of exposure
• aperture, shutter speed, and iso together are referred to as “the exposure triangle”

  resources

• wikipedia

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Table of contents

• aperture
• iso
• shutter speed