Nikon D810 - 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 490 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