Nikon D3S - Manual (Page 104)

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d
Image Area
The camera’s FX format (36.0 × 23.9 mm)
image sensor can be used to record pictures
with an image area (picture angle)
equivalent to a 35mm (135) format film
camera. Image area is selected using the
Image area option in the shooting menu. At
the default setting of Auto DX crop, the camera will automatically
crop pictures to the DX picture angle when a DX format lens is
attached. The Choose image area option can be used to select a
35mm picture angle or to crop photographs to the DX format or
1.2 × picture angle or to a 5 : 4 aspect ratio.
❚❚Auto DX Crop
Choose whether to automatically select a DX crop when a DX lens
is attached.
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.