Nikon D4 - Manual (Page 111)

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Image Recording Options
Choose the aspect ratio and angle of view (image area). Thanks to
the camera’s FX format (36.0 × 23.9 mm) image sensor, you can
choose from angles of view as wide as those supported by 35 mm
(135) format film cameras, while automatically cropping pictures
to the DX angle of view when using DX format lenses. See page
444 for information on the number of pictures that can be stored
at different image area settings.
❚❚Auto DX Crop
Choose whether to automatically select a DX
crop when a DX lens is attached.
Image Area
Option Description
On
Camera automatically selects DX crop when DX lens is
attached. If another lens is attached, the crop selected for
Choose image area will be used.
Off Crop selected for Choose image area is used.