Nikon D4s - Image Recording Options; Image Area

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Image Recording Options
Choose from image areas of FX (36 × 24) 1.0× (FX format), DX (24
× 16) 1.5× (DX format), 5 : 4 (30 × 24), and 1.2× (30 × 20) 1.2×.
See page 464 for information on the number of pictures that can
be stored at different image area settings.
Image Area
DX format (24×16)
image circle
FX format (36×24)
image circle
FX format
1.2×
5:4
DX format