Pentax K10D - Setting the Exposure; Effect of Aperture and Shutter Speed

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Function Reference
Setting the Exposure
Correct exposure of the subject is determined by the combination of
shutter speed and aperture setting. There are many correct combinations
of shutter speed and aperture for a particular subject. Different
combinations produce different effects.
The shutter speed determines the length of time that light is allowed to
strike the CCD.
Using slower shutter speed
If the subject is moving, the image will be
blurred because the shutter is open
longer.
It is possible to enhance the effect of
motion (rivers, waterfalls, waves, etc.) by
intentionally using a slower shutter speed.
Using faster shutter speed
Choosing a faster shutter speed will allow
freezing the action of a moving subject.
A faster shutter speed also helps
preventing camera shake.
Effect of Aperture and Shutter Speed
Effect of Shutter Speed