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The Learning Curve
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The Learning Curve (Weird Science, 1996).iso
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shutter.txt
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1996-06-14
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SHUTTER SPEEDS
All cameras have, at least, one shutter speed. Most have
several,and some have many. They are often set automatically, but
in the more sophisticated cameras, can usually be set manually
too.
The shutter is the device that exposes the film to light, and
the 'shutter speed' is the length of time that it is 'open'.
The shutter speed works in conjunction with the aperture to
control the exact amount of light reaching the film - it also
controls how the subject is recorded with respect to motion.
On a typical modern Single Lens Reflex - SLR - there may be
a range of speeds from as fast as 1/4000 sec down to 30 seconds
in many increments. ( 1/60 th. second delivers half the light of
1/30th. and double that of 1/125 th. )
If you want to record fast moving subjects sharply, then a
fast speed is best selected, say 1/500 th. or 1/1000 th.
Subjects which do not move can be photographed with slow speeds
and a tripod to prevent camera shake.
Electronic cameras often deliver 'stepless' speeds - any speed
between the upper and lower limit is possible.