Samsung R50 ユーザーズマニュアル

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English
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The following examples are some of the situations where the autofocus 
function may work, but not as desired.
When both near and far objects are 
present
Use the focus-lock function to lock the 
focus on an object at the same distance as 
the desired subject, then reposition the 
camera to compose the picture.
Fast-moving subjects
Use the focus-lock function to lock the 
focus on an object at the same distance as 
the desired subject, then reposition the 
camera to compose the picture.