Nikon D4 - Manual (Page 97)

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Image Area
Regardless of the option selected for Image area in the shooting
menu (
0 88), all movies and photographs recorded in movie live
view have an aspect ratio of 16 : 9 (or 3 : 2 when the movie frame
size is 640 × 424). Images recorded with On selected for Image
area > Auto DX crop and a DX lens attached use a DX-based
movie format, as do images recorded with DX (24Ч16) 1.5Ч
selected for Image area > Choose image area. Other images use
an FX-based movie format. A
a icon is displayed when the DX-
based movie format is selected. The differences between the
crops (
0 86) displayed during viewfinder and live view
photography and movie live view photo crop are shown below.
The size of the area at the center of the image sensor used to
record photographs taken in movie live view is 35.0 × 19.7 mm
(16 : 9, FX-based movie format), 22.4 × 12.6 mm (16 : 9, DX-based
movie format), 35.0 × 23.4 mm (3 : 2, FX-based movie format), or
22.4 × 14.9 mm (3 : 2, DX-based movie format).
Crop for viewfinder and live view
photography
16 : 9 photo crop for movie live view
Crop for viewfinder and live view
photography
3 : 2 photo crop for movie live view