Sony cyber-shot dsc-n1 ユーザーズマニュアル

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Adjusting the ISO sensitivity
ISO is unit of measurement (sensitivity), estimating how much light an image pickup device 
(equivalent to photo films) receives. Even when the exposure is the same, images differ 
depending on the ISO sensitivity.
To adjust the ISO sensitivity 
Characteristics of “shutter speed”
Characteristics of “aperture” 
(F value)
Faster
Moving objects 
appear stopped.
Slower
Moving objects 
appear to flow.
Open
In-focus range 
narrows, both 
backward and 
forward.
Close
In-focus range 
widens, both 
backward and 
forward.
High ISO sensitivity
Records a bright image even when shooting in a dark location. 
However, the image tends to become noisy.
Low ISO sensitivity
Records a smoother image.
However, when the exposure is insufficient, the image may become darker.