The shutter controls not only exposure, but also the ability to stop motion. Fast shutter speeds are used in sport photography to stop action. Slow shutter speeds can be used to show the flow of motion such as water cascading over a waterfall. The use of a tripod is recommended with slow shutter speeds.
The change in aperture and shutter speed is not apparent in the live image. For critical work, take a test photograph at the set aperture or shutter speed and view the result in Quick View. The image can be deleted if not acceptable and another test image can be taken at a different setting.
Ev stands for exposure value. A change of one Ev adjusts the exposure calculated by the camera by a factor of two.
+2.0 Ev | 4X as much light |
+1.0 Ev | 2X as much light |
±0.0 Ev | Calculated exposure |
1/2 as much light | |
1/4 as much light |
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