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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. Unlike film
cameras, test photographs can be taken and immediately viewed. For critical work, take
a test photograph at the set aperture or shutter speed and view the result in Quick View
(p. 30). The image can be deleted if not acceptable and another test image can be taken
at a different setting.