Uniden udc7m ユーザーズマニュアル

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Using the autofocus
The autofocus will work in almost all situations; however, there are certain 
conditions that may cause the autofocus function to not work properly. If the 
autofocus function is not working properly, set the focus range to capture 
images (page 51).
Conditions that may cause incorrect focus
The following examples are some of the situations where the autofocus 
function may not work.
Subjects with low contrast, very bright 
subjects at the center of the image or 
dark subjects or locations
Use the focus-lock function to lock the 
focus on an object with contrast at the 
same distance as the desired subject.
Subjects without vertical lines
Use the focus-lock function to lock the 
focus while framing the subject vertically, 
then re-orient the camera to compose a 
horizontally framed image.