Nikon Df - Manual (Page 342)

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Calculating Angle of View
The Df can be used with Nikon lenses for 35mm (135) format cameras. If
Auto DX crop is on (0 52) and a 35mm format lens is attached, the
angle of view will be the same as a frame of 35mm film (36.0 ×
23.9 mm); if a DX lens is attached, the angle of view will automatically be
adjusted to 23.4 × 15.5 mm (DX format).
If a 35 mm format lens is attached, the angle of view can be reduced by
1.5 × by turning Auto DX crop off and selecting DX (24×16).
The DX (24×16) angle of view is about 1.5 times smaller than the 35mm
format angle of view. To calculate the focal length of lenses in 35mm
format when DX (24×16) is selected, multiply the focal length of the
lens by about 1.5 (for example, the effective focal length of a 50mm lens
in 35mm format would be 75 mm when DX (24×16) is selected).
FX (36×24) picture size (36.0 × 23.9 mm,
equivalent to 35mm format camera)
Lens
Picture diagonal
DX (24×16) picture size (23.4 × 15.5 mm,
equivalent to DX format camera)
Angle of view (FX (36×24); 35mm format)
Angle of view (DX (24×16); DX format)