Pentax 57233 - Manual (Page 76)

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A correct exposure is established by a combination of shutter
speed and aperture setting according to the subject’s brightness.
There are many correct combinations of shutter speed and
aperture for a particular subject’s brightness. Different shutter
speed and aperture settings produce different effects.
SELECTING ANOTHER EXPOSURE
MODE
Effect of Aperture and Shutter Speed
Effect of shutter speed
The shutter speed determines the film exposure times, or the
length of time that the light is allowed to strike the film.
If the subject is moving, the
image will be blurred when a
slow shutter speed is used.
It is possible to enhance the
effect of motion, (The
movement of a waterfall) by
intentionally using a slower
shutter speed.
Choosing a faster shutter
speed will allow the image of
a moving subject to be frozen.
A faster shutter speed also
helps prevent camera shake.
Slower shutter speed
Faster shutter speed