文档介绍：TIME, SPACE, IMAGINATION, AND THE CAMERA
Use the image optical stabilization or anti-shake camera Table Shutter Speed Needed to Stop Action Parallel
system if it is available on your camera. Optical stabilization to the Camera
will reduce image blur caused by hand and body motion and is
Shutter Speed Action
especially useful when using long (telephoto) focal lengths in any
1/125 of a Most everyday human activities, moving rivers
circumstances. With any camera-pensating system, it’s second and streams, trees in a light wind.
important to bear in mind that it cannot stop the motion of a moving
1/250 of a Running animals and people, birds in fl ight, kids
subject. second playing, balloons and kites, swimmers, and
Imaging software utilizes motion blur fi lters to mimic the effect waves.
of taking a picture of a moving object with a slower (longer) exposure 1/500 of a Automobile at 30 miles per hour, bicyclists,
time. It can blur an image in a specifi ed direction representing your second motorcyclists, sport activities such as baseball,
football, and tennis.
point of view (from −360 to +360 degrees), at a specifi ed intensity
1/1000 of a Automobile at 70 miles per hour, jet airplanes
representing any shutter speed below a 1/30 of a second, and at a
second taking off, high-speed trains, skiers, and
specifi ed intensity (from 1 to 999). speedboats.
The telephoto focal length is useful for isolating action, as
it will diminish the depth of fi eld at any given aperture and
therefore visually separate the subject from the background. Stopping Action with Electronic Flash
Prefocusing, using autofocus lock, or using continuous autofocus all The ability of electronic fl ash to stop movement depends on the dura-
e options to consider to ensure the results are sharply tion of the fl ash. An average built-in fl ash unit usually gives the
focused. equivalent shutter speed of 1/250 to 1/500 of a second. High-end
The shutter speed neede