Nikon D7200 Manuel D’Utilisation

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Image Area
Selecting 1.3× (18×12) for Image area in the movie shooting 
menu (
0 274) reduces the angle of view and increases the 
apparent focal length of the lens. Note that movies recorded at 
the same frame size but with different image areas may not have 
the same resolution.
DX (24×16)
1.3× (18×12)