Nikon D4S - Manual (Page 92)

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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). Movies recorded with an FX-format lens and FX
(36Ч24) 1.0Ч, 1.2Ч (30Ч20) 1.2Ч, or 5 : 4 (30×24) selected for
Image area are recorded in a format referred to as “FX-based
movie format”, while “DX-based movie format” is used for those
recorded with a DX-format lens and Auto DX crop (
0 86) selected
for Image area, or with a DX- or FX-format lens and DX (24Ч16)
1.5Ч selected for Image area. The differences between the crops
displayed during viewfinder and live view photography and movie
live view photo crop are shown below.
The approximate size of the area at the center of the image sensor
used to record photographs taken in movie live view is 35.7 ×
20.1 mm (16 : 9, FX-based movie format), 23.3 × 13.0 mm (16 : 9,
DX-based movie format), 35.7 × 23.8 mm (3 : 2, FX-based movie
format), or 23.3 × 15.4 mm (3 : 2, DX-based movie format).
16 : 9 photo crop for
movie live view
Crop for viewfinder
and live view
photography
3 : 2 photo crop for
movie live view
Crop for viewfinder
and live view
photography