Nikon Df - Manual (Page 71)

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Image Recording Options
Choose an image area from FX (36Ч24) 1.0Ч and DX (24Ч16) 1.5Ч.
Image Area
A
DX Lenses
DX lenses are designed for use with DX format cameras and have a
smaller angle of view than lenses for 35mm format cameras. If Auto DX
crop is off and FX (36Ч24) 1.0Ч (FX format) is selected for Choose
image area when a DX lens is attached, the edges of the image may be
eclipsed. This may not be apparent in the viewfinder, but when the
images are played back you may notice a drop in resolution or that the
edges of the picture are blacked out.
Viewfinder display
Photo with FX
image area (36×24)
Photo with DX
image area (24Ч16)