Nikon D780 DSLR Camera (Body Only) - Manual (Page 176)

130 Shooting Settings
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Choose Image Area
Choose the image area. The following options are available:
Option Description
c [ FX (36×24) ]
Images are recorded in FX format with an angle of
view equivalent to a NIKKOR lens on a 35 mm
format camera.
a [ DX (24×16) ]
Images are recorded in DX format. To calculate the
approximate focal length of the lens in 35 mm
format, multiply by 1.5.
m [ 1:1 (24×24) ] Pictures are recorded with an aspect ratio of 1 : 1.
Z [ 16:9 (36×20) ] Pictures are recorded with an aspect ratio of 16 : 9.
1 FX (36×24)
2 DX (24Ч16)
3 1 : 1 (24Ч24)
4 16 : 9 (36Ч20)
5 DX format (24×16) image
circle
6 FX format (36×24) image circle