Инструкции Пользователя для Nikon D7500 18-300mm Lens Kit

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AF-Area Mode
AF-area mode controls how the camera selects the focus-point 
for autofocus. The following options are available during 
viewfinder photography:
• Single-point AF: Select the focus point; the camera will focus on 
the subject in the selected focus point only. Use with stationary 
subjects.
• Dynamic-area AF: Select the focus point. In AF-A and AF-C focus 
modes, the camera will focus based on information from 
surrounding focus points if the subject briefly leaves the 
selected point. The number of focus points varies with the 
mode selected:
9-point dynamic-area AF: Choose when there is time to compose 
the photograph or when photographing subjects that are 
moving predictably (e.g., runners or race cars on a track).
21-point dynamic-area AF: Choose when photographing subjects 
that are moving unpredictably (e.g., players at a football 
game).
51-point dynamic-area AF: Choose when photographing subjects 
that are moving quickly and can not be easily framed in the 
viewfinder (e.g., birds).