Nikon D500 - Manual (Page 353)

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Calculating Angle of View
The size of the area exposed by a 35mm camera is 36 × 24 mm. The
size of the area exposed by the D500 when DX (24×16) is selected for
Choose image area in the photo shooting menu, in contrast, is
23.5 × 15.7 mm, meaning that the angle of view of a 35mm camera is
approximately 1.5 times that of the D500 (when 1.3Ч (18Ч12) is
selected, the size of the area exposed decreases, further reducing the
angle of view by about 1.3×).
Lens
35 mm format picture size (36 × 24 mm)
Picture diagonal
Picture size when 1.3Ч (18Ч12) is selected for
Choose image area (18.0 × 12.0 mm)
35 mm format angle of view
Angle of view when 1.3Ч (18Ч12) is selected for
Choose image area
Picture size when DX (24×16) is selected for
Choose image area (23.5 × 15.7 mm)
Angle of view when DX (24×16) is selected for
Choose image area