Nikon D5 - Manual (Page 111)

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d
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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 35 mm format cameras. If Auto DX
crop is off and an option other than DX (24×16) (DX format) is selected
for 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.
1.2× DX format 5 : 4
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See Also
See page 69 for information on the crops available for movie recording.