Pentax ist d 사용자 설명서

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More Details about Capture Functions
Correct exposure of the subject is established by a combination of shutter 
speed and aperture setting. There are many correct combinations of 
shutter speed and aperture for a particular subject. Different shutter speed 
and aperture settings produce different effects.
The shutter speed determines the length of time that the light is allowed to 
strike the CCD, to adjust the amount of light striking 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.
Even if the subject is not moving, a faster 
shutter speed also helps prevent camera 
shake.
Effect of Aperture and Shutter Speed
Effect of shutter speed