Nikon D7100 - Manual (Page 330)

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A 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 D7100 when DX (24×16) is selected for Image area in the shooting menu, in contrast,
is 23.5 × 15.6 mm, meaning that the angle of view of a 35mm camera is approximately 1.5
times that of the D7100 (when 1.3Ч (18Ч12) is selected, the size of the area exposed is
reduced and the angle of view is reduced by a further 1.3×).
Picture size (35mm format)
(36 × 24 mm)
Lens
Picture size when DX (24×16) is selected
for Image area (23.5 × 15.6 mm)
Picture size when 1.3Ч (18Ч12) is selected
for Image area (18.8 × 12.5 mm)
Picture diagonal
Angle of view (35mm format)
Angle of view when DX (24×16) is selected for Image area
Angle of view when 1.3Ч (18Ч12) is selected for Image area