Nikon d3s User Manual (en)

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A
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 picture angle 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 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