Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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P, S, A, and M Modes
Metering
Choose how the camera sets exposure.
Exposure
Method
Description
Matrix metering
Produces natural results in most situations. The 
camera meters a wide area of the frame and sets 
exposure according to tone distribution, color, 
composition, and distance.
M
Center-weighted 
metering
Classic meter for portraits. Camera meters entire 
frame but assigns greatest weight to center area. 
Recommended when using filters with an 
exposure factor (filter factor) over 1×.
Spot metering
Choose this mode to ensure that subject will be 
correctly exposed, even when background is 
much brighter or darker. Camera meters current 
focus point; use to meter off-center subjects.