Stop (exposure)
Stop (lichtwaarde) · Exposure
A unit of light: one stop is half or double the amount of light.
Aperture, shutter speed and ISO all work in stops. From f/2.8 to f/4 is one stop less light. From 1/125 to 1/250 is one stop less light. From ISO 400 to ISO 800 is one stop more sensitivity. Stops are the common language of the exposure triangle.
Tools that help with this: