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WHAT IS AN EV? WHAT IS A STOP?
Ev stands for exposure value. Stop refers to click stops in mechanical cameras. A change of one Ev
or one stop will adjust the exposure calculated by the camera by a factor of two.
Change in Ev
Change in stops Adjustment to exposure
+2.0 Ev
+1.0 Ev
0.0 Ev
–1.0 Ev
–2.0 Ev
+2 stops
+1 stop
Calculated exposure
–1 stop
–2 stops
4X as much light
2X as much light
1/2 as much light
1/4 as much light
Sometimes the camera’s exposure meter is deceived by certain conditions.
Exposure compensation can be used in these situations. For example, a very
bright scene, such as a snowy landscape or a white sandy beach,
can appear too dark in the captured image. Before taking the pic-
ture, adjusting the exposure by +1 or +2 EV will result in an image
with normal tonal values.
In this example, the dark scene appears bright and washed-out on
the LCD monitor. By decreasing the exposure by –1.5 EV, the rich-
ness of the sunset is preserved.
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