Nikon D810 User Manual page 100

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Image Area
The selected option is shown in the
information display.
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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 an option other than DX (24×16) (DX 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.
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The Viewfinder Display
The 1.2×, DX format, and 5 : 4 crops are shown below; the area outside
the crop can be viewed in gray when Off is selected for Custom Setting
a6 (AF point illumination, 0 310).
1.2×
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See Also
See page 59 for information on the crops available in movie live view.
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DX format 5 : 4