Nikon D5500 Manuale Di Riferimento

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A
AF-Area Mode
AF-area mode selections made in shooting modes other than PSA, or 
M
 are reset when another shooting mode is selected.
A
3D-Tracking
If subject leaves the viewfinder, remove your finger from the shutter-
release button and recompose the photograph with the subject in the 
selected focus point. Note that when the shutter-release button is 
pressed halfway, the colors in the area surrounding the focus point are 
stored in the camera. Consequently 3D-tracking may not produce the 
desired results with subjects that are the same color as the 
background.